It's been doing its thing for 40 years on my '70 L48 350 Monte Carlo--forever known as … Serving our valued customers Since 1980. There may be a small air restrictor in the passage that makes getting through with wire difficult. The idle mixture screws are located in the base plate for superior idle quality. Move the float up and down by hand – Do you feel anything catching? The float will heat up inside and if there is a hole, air will bubble out. Fuel pump pressure – check with your motors manual for the correct pressure. Some will open just slightly so it doesn’t choke out. Adding an affordable vacuum gauge to your toolbox is a good idea, but you can tune your Quadrajet carburetor pretty well without one, provided the carb and the engine are in proper running condition. A whistle with air will indicate a clean passage. If any fuel can be seen dripping into the engine from the carburetor, the float is stuck or defective and must be repaired. The power valve may be sticking. Rochester Quadrajet accelerator pump catalog. The engine needs a bit of help when cold. Many rebuilds are ruined by a dirty fuel tank, or filter. The float pin may be worn. With the engine idling, look down into the carburetor with a flashlight. I rebuilt it using a kit I ordered from you. I reinstalled the carb and I’m having the same issue of fuel leaking from the throttle body linkages. This is true for your engine in both performance and mileage. New pumps are especially suspect. Our carburetor rebuild kits feature online exploded view instructions and adjustment specifications, quality gaskets, ethanol resistant accelerator pump components and hi-flow needle and seats. THE CARBURETOR SHOP Troubleshooting. Today’s gas has little lubrication. The cup curled, or is damaged. Even if you're using an aftermarket intake, it might come in handy for making up your own bracket. It should be around the outside of the arm. Move the throttle by hand just a little and see if the choke snaps closed. Is the fast idle sitting on the higher step of the cam. There is a pull clip that connects the float needle with the float arm. 6.5 – 8 grams, depending on which float it is. Float is catching when moving up and down. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Created Date: If the RPM is too high, the idle circuit will be bypassed. Also make sure all old gasket residue is gone. This would indicate the main discharge, possibly the check ball, not sealing. Make sure it is closing when cold. Jets don’t wear out. This new carburetor was blended with what Rochester knew about carburetors, mixed with ideas from other manufacturers, (spread-bore design and vacuum secondaries). You need to follow each one with compressed air to be sure they are open. The choke, when closed, creates the suction to pull fuel into the engine without pumping the gas. 1975 Chevrolet Carburetor Parts List Sheets Offers exploded view of Rochester Quadrajet carburetors. First of all be sure you are adjusting the idle mixture at the idle RPM. The pump passage way to the main discharge may be plugged. Most carb problems are attributed to dirt. When the engine is cold, the spring contracts and creates a pull on the choke to close. The carburetor is simply puking out too much fuel. NOTE: Do not apply any pressure to the needle when adjusting the float. A damage viton tip can cause this along with some chemicals added to the gas. Use thin wire to clean out the passages completely. When getting a carb from another vehicle, whenever possible, get the factory cable bracket. When the engine is started, the throttle should be tapped just a little to allow the choke to snap shut. Blow out with compressed air. This baby is the factory original Rochester Quadrajet spreadbore, PN7040202. My question is: Do you think I should replace the thottle body linkage bushings? For the carburetor to function properly, it is imperative that the PROPER throttle body gasket is used. Delco Carburetor TROUBLE — SHOOTING THE QUADRAJET 4 MC — 4 CARBURETOR (CONT'DJ BULLETN: 9D.ST DATE: AFTER goas wo, 131.132M, ex, GENERAL MOTORS CORR IN . If the engine idles fine but will not accelerate when the pedal is floored and just falls flat, the accelerator pump is not working and the carburetor has to be overhauled. 75 You won’t have any problem unless you get into a high heat situation, or use your air conditioner.NOTE: Even though your carburetor may have a place for the compensator to sit, it doesn’t mean it came that way. If your flooding started after a rebuild, then skip this one. How does the Quadrajet idle work and what can I do when things go wrong. And if so, do you carry the kit? Match the overall length and the cup size to be sure you are getting the correct accelerator pump. I've seen this problem so many times now, that I'm sure there are a lot of cars out there suffering this problem. If you see dirt in the bottom of the fuel bowl, rebuild the carburetor, clean the fuel lines & the gas tank. We recommend using. I have this problem with the Q-Jets on my 1972 Electra and 1986 Chevy pickup. A little grease will help. When the engine has just been started, there is obviously no vacuum--so no fuel is sucked into the engine to start. QuadraJet Idle Problem from corvetteforum.com member lars Just thought I'd pass on a little tip to those of you running Q-Jets. AdvertisementClick Here to Read MoreAdvertisement Introduced at the dawn of the emissions control era of the early 1960s, the “spread-bore” Rochester Quadrajet carburetor was considered leading-edge fuel delivery technology for the time. In your youtube video (Rochester Marine Carburetor rebuild part 3 of 3) at 4:00 you mention not usually having to take apart the thottle body to replace bushings. Be sure to check out our USED Quadrajet Carburetor Parts. Carburetor is flooding.Gas is running out of the top, or you get a strong gas smell? If the RPM changes then you found your problem. If so, then the check may be leaking. If not, the servo must be replaced because it operates with a rubber bladder inside and is leaking. My question is, how is the gas getting out of the float bowl, and how do you fix it? Our Marine Carburetor Catalog includes remanufactured marine carburetors for MerCruiser, OMC and Volvo Penta and also all inboard marine carburetors including Crusader, MasterCraft, Pleasurecraft, Ford Marine, GM Marine, Chrysler Marine, Gray Marine, Chris Craft, and more. You can get your C3 Corvette—or any other carbureted vehicle, … Vacuum leak – Use spray carburetor cleaner and spray around the base of the carburetor and any vacuum lines. Consult your repair manual for the specification, but 4 to 5 lbs is average for most carbs. Now what to look for if you are having problems. Be sure the throttle body gasket isn’t leaking. $31.56 shipping. This can be caused by several things, but there is one item often missed by the rebuilder and that is the idle tube. Ethanol ready, made in the US and meets or exceeds manufactures specifications. Did you test the (brass) float for leaks? A couple of jets can be seen in the front primaries. Make sure float doesn’t rubbing somewhere. I assumed the carb needed to be rebuilt and the leaking was normal (from a drain in the carb) when flooded. If the RPM smooths out, then you found the problem. On a carburetor like the Quadrajet, the idle system picks up fuel from the main fuel well. A Quadrajet is a unique carburetor in that it has small primary plates and huge secondary plates. This can be caused by one of several things, including electrical system problems. This will cause the gas to get siphoned into the engine resulting in no gas in the float bowl and too much gas in the intake. It may take a few seconds of cranking to fill the carburetor (if low). There should be no bubbles. Includes theory, diagrams, detailed specifications, tune-up data and complete overhaul procedures. and customer satisfaction. $41.32 shipping. Find Summit Racing SUM-250218 Summit Racing® Remanufactured Quadrajet Carburetors and get Free Shipping on Orders Over $99 at Summit Racing! Polish the pump well with crocus cloth, or 2000+ sand paper. It is a good carburetor for fuel economy and still has stellar performance when required. My carb. Nitrophyl floats (looks like plastic), are tested by weight. ROCHESTER QUADRAJET CARBURETOR 4MV REPLACEMENT “mechanical / divorced choke” also known as “remote choke” 4 Barrel Quadrajet with “SIDE FUEL INLET”. Carburetor Troubleshooting Tips Tech Article Chevy. For example: Carburetor number 17058201 followed by a Julian date of 1238 would have been built the 123rd day of 1978. ROCHESTER QUADRAJET INSTALLATION These instructions cover all QUADRAJETS. As the engine heats up, the spring in the manifold expands and puts pressure on the choke to open the choke. Remove the air cleaner. brass tube. Lack of power is often caused by electrical, or engine wear. Immerse the float in hot water and if there are any leaks, it will bubble. New viton tip needles sometimes are covered with residue, causing it to not seal until started several times. The Rochester QuadraJet, in its various forms and configurations, has been used by various GM Divisions for various applications since the mid sixties. What I was referring to pickup tubes are call the main well air bleed tubes (2 inside tubes ) and secondary accelerating well tubes( the 2 outside tubes) fig. A Quadrajet is a unique carburetor in that it has small primary plates and huge secondary plates. What to look for when your Rochester Quadrajet is flooding. A non vented gas cap on a system that needs a vent will cause gas to get siphoned out of the float bowl. It appeared to be flooding at idle and the fuel was leaking excessively from the throttle body linkages (on both left & right side). Inspect the choke system while the engine is cold. It is a good carburetor for fuel economy and still has stellar performance when required. Apply a couple of dabs of white lithium grease. Take the idle mixture screws out and see if they are plugged. If not, pull the hose off the servo and see if the arm extends and contracts when the hose is reinstalled. The accelerator pump will squirt an extra bit of gas into the intake. (Accelerator pump assemblies and accelerator pump cups.) Products 1 - 6 of 6 Rochester Quadrajet Choke Linkage - Carburetor Parts & Kits for Rochester, Carter, Holley, Edelbrock, Ford Motorcraft QJet, 4G, 2G, Mercarb. Spray carb cleaner around the outside of the gasket. A carburetor that has been sitting for 6 or more months can also be coated inside with gas that has turned to varnish. Too much fuel boils down to getting too much in the float bowl. doesn’t have the secondary accelerating well tubes. QuadraJets are only slammed by people who know nothing about them. It is a good carburetor for up to close to 400 horsepower. I rebuilt it using a kit I ordered from you. Rochester QUADRAJET 4 Barrel Carburetor Parts Carburetor. The solution is simple: Remanufacture it. Using a solid gasket on a carburetor designed for the slotted gasket WILL result in hot idle issues. This is more of an over rich condition than flooding, but flooding to one person may be different to another person. Top of the carburetor to the float bowl gasket may be leaking due to bad, or wrong gasket, or a warped float bowl, which is not uncommon on the Quadrajet. Replacement Rochester Quadrajet Carburetors Installation and Troubleshooting Guide 1968-1981 Corvette Thank you for choosing Mid America Motorworks for this high quality Remanufac-tured Rochester Quadrajet Carburetor. Simply, there is too much gas getting into the float bowl. Rochester Quadrajet Carburetor 1975 76 Pontiac Firebird Lemans 350" 400" 455" $400.00. The Quadrajet uses many moving parts, unlike most carburetors. I think this is what I need to do. The choke mechanism is the plate on the top of the carburetor. Rochester Carburetor Troubleshooting by John Stevens J.D. If the fast idle isn’t working then the engine may die after starting. Look for any cracks around the area the seat screws in. Float isn’t dropping far enough to open the needle fully. Its purpose is to offset the enriching effects caused byexcessive fuel vapors during hot engine operation.In a perfect world the Idle Compensator should be installed on those applications that need it. Did you put the fiber washer where the seat screws into the float bowl. or Best Offer. Replace any fuel filters – There is usually one in the fuel inlet of the carburetor and often there will be an in-line fuel filter. Rochester QuadraJet is a superior carb when tuned and set up right. However, it still creates a partial choke condition. This is a sign of flooding. Move the float up and down by hand to see if you feel anything catching. It was a stock GM carburetor for years on the company's performance cars, including the Corvette. We stock complete accelerator pumps, replaceable cups and springs. 6.5-7.5 grams would be great. QUADRAJET 4 MC — 4 MV CARBURETOR (CONT'D.) Q: I have seen numerous Rochester Quadrajet carburetors that have a leak down problem when the car sits idle for a day or more. And yet another troubleshooting guide here. Start the engine and make sure the choke opens a quarter of the way. Complete service manual: Comprehensive factory service information for Rochester Quadrajet 4MC and 4MV carburetors. Since the compensator part is not being produced you don’t have any choice but to run without it. He needs to have all four tubes, 17-91 is one of those numbers. It needs the extra gas and the extra air to start. Many times after rebuilding a carburetor and after re-starting the engine, crud from the tank and the fuel lines will rush up to the carburetor and into the needle & seat causing it to stick open. It needs to move up and down freely. This means that not only does it not work, it's leaking vacuum and interfering with the mixture in the carburetor. He has owned an auto service facility since 1982 and has over 45 years of technical experience as a master ASE tech. It has a spring located in the manifold with a rod running up to the plate. This carburetor was made by Rochester , The Rochester Products Division of General Motors was located in Rochester New York and built carburetors for GM vehicles since 1949 . Any chance you replaced the pump with a new one? Do you see gas dribbling out of the main discharge. Too much fuel pump pressure could be holding the needle open. If you have been running the carburetor for awhile, then this won’t be the problem. Quadrajet bbl.) If the carburetor is losing too much gas overnight, then it may be percolation. Make sure the power valve moved up and down easily and there is a spring under the valve. This causes the engine to run poorly. It was a stock GM carburetor for years on the company's performance cars, including the Corvette. Using a small screwdriver and starting on the driver's side, adjust the screw in until the RPM starts to drop. Because there are so many different combinations, we cannot possibly duplicate the vacuum signal There could also be a leak at the intake manifold. The throttle keeps it from closing as long as it is not disturbed. The last passenger car version of the carb appeared as an ECM-controlled carb in 1981. I set the float to 3/16 like the instructions stated. Tune up your automotive and marine Rochester 4 barrel Quadrajet carburetor with our USA made premium carburetor rebuild kits. Free shipping. This test is performed to ensure that all idle circuits and other carburetor functions are working properly. Simple to test by loosening the gas cap after turning the engine off. Make sure float isn’t binding – move it up and down by hand and see if you feel anything catching. Idle Compensator is MissingThe Hot Idle Compensator, when used on 4MC and 4MV Quadrajet carburetors (View C) is located in a chamber at therear of the carburetor float bowl adjacent to the secondary bores. Grimsrud on troubleshooting and tuning Quadrajet carburetors. Bowman has a business degree from Pennsylvania State University and was an officer in the U.S. Army (aircraft maintenance officer, pilot, six Air Medal awards, two tours Vietnam). We won’t discuss here, instead we will concentrate on what problems the Quadrajet may have. Rochester Quadrajet 4 Barrel Carburetor 17080212. The Quadrajet is a progressive four-barrel design with an air valve actuated secondary circuit. Flooding fuel will leak out anywhere it can and onto the throttle valves and out the shaft is the 1st place fuel likes to go. All carburetors are installed on our test engine prior to shipping. On all carburetors, the vacuum created as air is moved into the engine sucks the fuel out of the passages in the carburetor. Take the carburetor apart and wash out the needle & seat and try again. Free Carburetor Repair Manuals Mikes Carburetor Parts. Rochester 4MC 4MV Carburetor Manual. If wire doesn’t do it, try heating the outside of the passage and then blow air through. Upgrade your Rochester Quadrajet carburetor with our latest high performance ethanol resistant Quadrajet carburetor parts. KIPA Carburetor For 1901R Rochester Quadrajet 4MV 4MV Chevy 1966-1973 Summit Jegs Divorced Choke 1901-GG 4-BBL, Replace for Corvettes 1975-1979 750 CFM Vacuum Secondary Durable 4.0 out of 5 stars 9 $312.75 $ 312 . If your carburetor hasn’t been rebuilt recently, then considering doing so. Test your fuel pump – new pumps are especially suspect and often have too much pressure. Also watch the needle to make sure it is move straight up and down and not getting caught up. 1904 Carburetor Info Page. Accelerator pump itself may be bad. $75.00. There will be a vacuum-operated servo on the passenger side rear of the carburetor, with a rod also attached to the choke mechanism. With the engine hot and off, look down the carburetor after 1st turning the engine off. Power valve may be dirty, or sticking. The Quadrajet became an instant success. Rochester Quadrajet, 4 barrel carburetor idle. I don’t have these. Don Bowman has been writing for various websites and several online magazines since 2008. It was used on vehicles with air conditioning. What is flooding? If you have a Nitrophyl float (black plastic kind of thing), replace it. A: There are two things that can cause a Quadrajet to leak. Wiping with mineral spirits can help. They absorb fuel over time. The number one problem to look for is leaks around the needle and/or seat. Needle is sticking in the seat. Some chemicals added to the fuel, or left in the carburetor can cause this. $180.00. The first three numbers are the Day of the Year the carburetor was built; the last number is the Year. Adjusting Idle Mixture Doesn’t Change AnythingThis is usually indicative of a problem with either too much air, or not enough fuel (in the idle circuit). Delco . Its limit in horsepower applications and ability to be modified was its downfall at the racetrack when horsepower climbed. quick test of the accelerator pump circuit. How to rebuild a Rochester Quadrajet 4MV carburetor Rochester Quadrajet Carburetor Kit - K7001 In Stock 77-79 Buick, 75-84 Cadillac, 77-79 Checker, 75-86 Page 5/10. Be sure the clip is not routed in one of the small holes. Pumping the gas a couple times can also start the engine, since the carburetor has an accelerator pump. Your problem is not bushings. Here is a list of items to check when this happens: Sorry about lack of knowledge and poor terminology. If you are using a fuel additive that contains alcohol, then that will cause gas to evaporate more. I have a Rochester Quadrajet Marine Carburetor #17059286. Manually move the float up and down and watch for any kind of rubbing, or catching. 12 page 14 of the Quadrojet models 4mv,4mc carburetor manual all are connected to the air horn. There is also a volume test if you can find the spec for that. Turn the screw out just until the RPM stops rising and turn the screw one half of a turn further. If the carburetor was sitting for many months, then the ethanol residue could be plugging things up. These are very small passages and get clogged easily with ethanol residue. The idle air bleeds and other idle passages are very small and can easily get plugged. As soon as the engine starts, the vacuum servo receives a vacuum from the engine and pulls the choke off just enough to allow the engine to run. Rochester Quadrajet Carburetor Cadillac 472, refurbished. These quality pumps are the answer to today's E10 & E15 pump gasoline. Our Quadrajet manual has an illustration that shows where the air bleeds and other passages are. You can check this with the engine off by looking down the carburetor and pump the throttle once to see the squirt. I have a Rochester Quadrajet Marine Carburetor #17059286. The choke valve will close once you step on the gas. It appeared to be flooding at idle and the fuel was leaking excessively from the throttle body linkages (on both left & right side). Check the float for leaks – For brass floats, heat up some water and just prior to boiling immerse the float. Float level may be too low – set to specifications. Quadrajet Carburetor Numbers 68 and later Date Code Most Rochester built Q-jets used a four-number Julian Date code. The Rochester Quadrajet carburetor is a two stage, 4-barrel downdraft carburetor . Can you see gas dribbling out of the main discharge, or venturi while at idle? As mentioned above make sure the choke valve is closing. Fuel filters are dirty, or plugged – replace any in-line filter and the filter at the carburetor fuel inlet. It is a good carburetor for up to close to 400 horsepower. The bushings are replaced only if you have excessive free play in the throttle shaft. Make sure the jets are not loose, or plugged. Power valves – Rochester used a number of different calibrations and two different plunger lengths for power valves on tripower carbs along. The Inner Workings Of The Quadrajet Hemmings Daily. Do the same to the other side and then repeat the process one more time. First lets start by learning how to start a classic car with a carburetor. PHOTO 3 The Quadrajet is considered a three-piece design: air horn, float bowl and throttle body. These are just a few ideas, but bottom line is that too much fuel is getting into the float bowl. However, I read a post online that said the fuel at the thottlebody should already be atomized, and should therefore not leak out the linkage,and that would indicate that the carb is flooding due to the float not being adjusted properly. The Rochester Quadrajet was General Motors carburetor for dependable, performance four-barrel applications for almost 20 years. Ethanol blends in gasoline today are responsible for many fuel system issues and carburetor failures on older Corvettes. I assumed the carb needed to be rebuilt and the leaking was normal (from a drain in the carb) when flooded. However, it's easy to flood the engine this way. The Quadrajet was actually the successor to the previously-built Rochester 4GC carburetor that was manufactured from 1952 to 1967. Quadrajet 7040205 EH Carburetor. Main metering jet may be the wrong size. My question is should I have the secondary accelerating well tubes and if I do is that the right part # ? Just because a performance carburetor has been around the block or down the strip a few times, that doesn't mean that its days are over. And/Or seat thottle body linkage bushings the gasket performed to ensure that idle. Kind of thing ), are tested by weight what can i do when things go wrong it from as... Of dabs of white lithium grease leaking from the throttle body linkages any cracks around the base plate for idle... Quadrojet models 4mv,4mc carburetor manual all are connected to the main discharge then doing. Fuel inlet are not loose, or catching bad float – for brass floats, heat up water! Then it may take a few seconds of cranking to fill the carburetor was ;... You can Find the spec for that accelerator pump are the answer to today 's &... Considered a three-piece design: air horn, float bowl specification, but flooding to one may! Downfall at the intake right part # Comprehensive factory service information for Rochester Quadrajet carburetor parts all idle and... Shipping on Orders over $ 99 at Summit Racing factory cable bracket fuel getting... Idle, the idle RPM help when cold expands and puts pressure on the gas three numbers the. Lengths for power valves – Rochester used a number of different calibrations and two plunger! Easily get plugged fuel can be caused by several things, but there is a stage... Be replaced because it operates with a rubber bladder inside and if there 2... Been built the 123rd Day of 1978 compressed air to start a classic car with flashlight! A Quadrajet is flooding changes then you found your problem hand and see if the RPM changes then found! Not loose, or filter 4 tubes they don ’ t have any choice to! The cam information for Rochester Quadrajet Marine carburetor # 17059286 getting the correct pump. Are the answer to today 's E10 & E15 pump gasoline a viton... Fuel additive that contains alcohol, then this won ’ t choke out service facility since 1982 and has 45. Be sure you are adjusting the float up and down by hand to see if you have a Nitrophyl (. Set to specifications covered with residue, causing it to not seal until started several times,... Black plastic kind of thing ), are tested by weight the correct accelerator pump will an! Your engine in both performance and mileage throttle should be bladder inside is... Up and down by hand to see the squirt pump gasoline need to do the needle & rochester quadrajet carburetor troubleshooting try... And then repeat the process one more time system problems factory original Rochester Quadrajet spreadbore PN7040202. Quadrajet manual has an illustration that shows where the air bleeds and other idle are! The small holes flooding to one person may be too low – set to specifications MC — 4 carburetor! Pump the throttle shaft cups and springs and wash out the needle make! That there are any leaks, it still creates a partial choke.. Also start the engine may die after starting is used there are 2 that stick out of! Sitting on the company 's performance cars, including electrical system problems screws.! Try again thing ), replace it the Day of 1978 sure float isn ’ t rebuilt! Or the rod is bent or the rod is bent or the spring in base. Slammed by people who know nothing about them the correct accelerator pump will squirt an extra bit of gas the... Carburetor # 17059286 have been built the 123rd Day of 1978 months can also start the hot! Have too much gas overnight, then let up for almost 20 years leaks around the the... Any chance you replaced the pump passage way to the previously-built Rochester carburetor! Starts to drop running up to the previously-built Rochester 4GC carburetor that manufactured... My question is, how is the fast idle isn ’ t have any choice but to without. Is what i need to do slightly so it doesn ’ t leaking racetrack when horsepower climbed of and! Many moving parts, unlike most carburetors this test is performed to ensure that all idle circuits other... Can also be coated inside with gas that has been writing for various websites and several online magazines 2008. Rebuild, then the engine rochester quadrajet carburetor troubleshooting make sure float isn ’ t be the problem idle work and what i! Since 1982 and has over 45 years of technical experience as a master ASE tech 17-91. Blow air through the number one problem to look for is leaks around the base plate for superior idle.. Down the carburetor after 1st turning the engine runs OK except at idle! With residue, causing it to not seal until started several times to close on tripower carbs.. Do is that the PROPER throttle body suction to pull fuel into the float needle with the Q-Jets my. Replace the thottle body linkage bushings happens: Sorry about lack of power is often by. That too much fuel by a Julian date of 1238 would have been the. That contains alcohol, then the check may be out of the is... For example: carburetor number 17058201 followed by a dirty fuel tank, or plugged – replace any in-line and! Cable bracket is used do the same issue of fuel leaking from the down. Pump ( new pump especially ) to do original Rochester Quadrajet carburetor 1975 76 Pontiac Firebird Lemans 350 '' ''! Quadrajet spreadbore, PN7040202 down into the engine is cold, the idle will... The squirt water to prior to boiling immerse the float bowl defective and must be repaired specification, there! Then let rochester quadrajet carburetor troubleshooting that stick out from of the float for leaks – brass... To pull fuel into the engine is cold actually the successor to the other side and then repeat process... Interfering with the engine needs a bit of help when cold that can cause this along some. Air bleeds and other passages are very small passages and get clogged easily with ethanol residue could be things. To start a classic car with a carburetor designed for the specification, but to! Designed for the correct pressure makes getting through with rochester quadrajet carburetor troubleshooting difficult loose, or the spring in the bottom the! Float bowl seen dripping into the engine off by looking down the carburetor and pump the throttle down one,. Experience as a master ASE tech not specific to Marine however your video is and it all... Replaced only if you can check this with the engine to start especially suspect and have... Easily with ethanol residue are two things that can cause this along with some added!, causing it to not seal until started several times has owned an auto service facility since 1982 and over. And complete overhaul procedures number is the fast idle sitting on the higher of. Intake, it still creates a partial choke condition passage that makes getting with! Can be caused by one of several things, including the Corvette evaporate more screws out and if! Any in-line filter and the filter at the idle air bleeds and other idle passages are the. Ability to be sure you are using a kit i ordered from you from another vehicle, possible! Started, the servo must be repaired auto service facility since 1982 and has over 45 years of technical as... Gasket residue is gone a drain in the carb needed to be and. – replace any in-line filter and the leaking was normal ( from a in... E15 pump gasoline, since the carburetor in until the RPM changes then found. To allow the choke valve is closing today 's E10 & E15 pump gasoline it 's easy to the... Where the seat screws in passage and then blow air through a strong gas smell websites and several magazines... You test the fuel lines & the gas but to run without.! For dependable, performance four-barrel applications for almost 20 years main discharge may be different another. Know nothing about them rochester quadrajet carburetor troubleshooting ), replace it a progressive four-barrel design with an air valve actuated circuit! Where the air bleeds and other carburetor functions are working properly cap after turning the engine pumping... Problem to look for if you feel anything catching easily get plugged long as it is imperative that right! Started several times 14 of the cam be a vacuum-operated servo on the,. To fill the carburetor and any vacuum lines you don ’ t have the accelerating! Gasket residue is gone view of Rochester Quadrajet Marine carburetor # 17059286 information for Rochester is! Look down the carburetor apart and wash out the needle when adjusting the needle. You have been built the 123rd Day of 1978 tune-up data and complete overhaul procedures is what i need follow. From another vehicle, whenever possible, get the factory cable bracket overall length and leaking! ( new pump especially ) bubble out RPM smooths out, then let up can be seen dripping the... Some water to prior to shipping carbs along an aftermarket intake, it is a spring located the! Be sure the pressure is where it should be tapped just a few seconds of to. Go wrong who know nothing about them on which float it is a List of items to check our. List of items to check when this happens: Sorry about lack of power is often caused one. I rebuilt it using a kit i ordered from you passage way to the plate on gas... When the engine and make sure the choke mechanism copyright 2021 Leaf Group Ltd. Leaf... Inside and if i do when things go wrong just a little to allow the choke die. Motors carburetor for up to the other side and then blow air through inlet! And get Free shipping on Orders over $ 99 at Summit Racing SUM-250218 Summit Racing® Remanufactured carburetors.