This is true for your engine in both performance and mileage. Rochester Quadrajet accelerator pump catalog. Dirt in the system – take the top off the carburetor. 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. $180.00. Rochester Quadrajet Carburetor 1975 76 Pontiac Firebird Lemans 350" 400" 455" $400.00. You can get your C3 Corvette—or any other carbureted vehicle, … It was used on vehicles with air conditioning. The carburetor is simply puking out too much fuel. This can be caused by several things, but there is one item often missed by the rebuilder and that is the idle tube. The fuel is too high in the float bowl and is being sucked out of the jets into the engine, thereby flooding the engine. Remove the air cleaner. If wire doesn’t do it, try heating the outside of the passage and then blow air through. Use thin wire to clean out the passages completely. The choke valve will close once you step on the gas. First of all be sure you are adjusting the idle mixture at the idle RPM. The Quadrajet became an instant success. Be sure the throttle body gasket isn’t leaking. My question is, how is the gas getting out of the float bowl, and how do you fix it? (Accelerator pump assemblies and accelerator pump cups.) 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. If the RPM changes then you found your problem. Rochester QuadraJet is a superior carb when tuned and set up right. A damage viton tip can cause this along with some chemicals added to the gas. This baby is the factory original Rochester Quadrajet spreadbore, PN7040202. Float isn’t dropping far enough to open the needle fully. and customer satisfaction. It’s description states that there are 2 that stick out from of the bottom of the float bowel top. On all carburetors, the vacuum created as air is moved into the engine sucks the fuel out of the passages in the carburetor. $31.56 shipping. Created Date: Test your fuel pump – new pumps are especially suspect and often have too much pressure. A: There are two things that can cause a Quadrajet to leak. First lets start by learning how to start a classic car with a carburetor. Rochester Quadrajet Carburetor Cadillac 472, refurbished. Grimsrud on troubleshooting and tuning Quadrajet carburetors. 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. ROCHESTER QUADRAJET INSTALLATION These instructions cover all QUADRAJETS. A Quadrajet is a unique carburetor in that it has small primary plates and huge secondary plates. This means that not only does it not work, it's leaking vacuum and interfering with the mixture in the carburetor. There could also be a leak at the intake manifold. We recommend using. How does the Quadrajet idle work and what can I do when things go wrong. Too much fuel boils down to getting too much in the float bowl. All carburetors are installed on our test engine prior to shipping. ROCHESTER QUADRAJET CARBURETOR 4MV REPLACEMENT “mechanical / divorced choke” also known as “remote choke” 4 Barrel Quadrajet with “SIDE FUEL INLET”. It needs the extra gas and the extra air to start. Rochester Carburetor Troubleshooting by John Stevens J.D. Main metering jet may be the wrong size. Polish the pump well with crocus cloth, or 2000+ sand paper. Move the float up and down by hand – Do you feel anything catching? Today’s gas has little lubrication. Be sure the clip is not routed in one of the small holes. Quadrajet bbl.) Spray carb cleaner around the outside of the gasket. These are just a few ideas, but bottom line is that too much fuel is getting into the float bowl. For the carburetor to function properly, it is imperative that the PROPER throttle body gasket is used. Products 1 - 6 of 6 Rochester Quadrajet Choke Linkage - Carburetor Parts & Kits for Rochester, Carter, Holley, Edelbrock, Ford Motorcraft QJet, 4G, 2G, Mercarb. The cup curled, or is damaged. If the engine runs OK except at an idle, the idle jets may be out of adjustment of dirty. Power valve may be dirty, or sticking. Here is a list of items to check when this happens: Sorry about lack of knowledge and poor terminology. They absorb fuel over time. Because there are so many different combinations, we cannot possibly duplicate the vacuum signal When the engine is started, the throttle should be tapped just a little to allow the choke to snap shut. Float level may be too low – set to specifications. Press the throttle down one time, then let up. Most carb problems are attributed to dirt. NOTE: Do not apply any pressure to the needle when adjusting the float. Vacuum leak – Use spray carburetor cleaner and spray around the base of the carburetor and any vacuum lines. Its limit in horsepower applications and ability to be modified was its downfall at the racetrack when horsepower climbed. You need to follow each one with compressed air to be sure they are open. Fuel filters are dirty, or plugged – replace any in-line filter and the filter at the carburetor fuel inlet. Using a solid gasket on a carburetor designed for the slotted gasket WILL result in hot idle issues. Wiping with mineral spirits can help. It appeared to be flooding at idle and the fuel was leaking excessively from the throttle body linkages (on both left & right side). The Rochester QuadraJet, in its various forms and configurations, has been used by various GM Divisions for various applications since the mid sixties. New viton tip needles sometimes are covered with residue, causing it to not seal until started several times. Turn the screw out just until the RPM stops rising and turn the screw one half of a turn further. The gas cap should be vented. A little grease will help. It is a good carburetor for fuel economy and still has stellar performance when required. Also watch the needle to make sure it is move straight up and down and not getting caught up. 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. Compatible with all Chevy/GMC trucks and cars 1966 thru 1973 Available for 327, 350, 396, 400, 402 or 454 Engines Bolts on to any Quadrajet/Spread bore GM style intake manifold A couple of jets can be seen in the front primaries. This causes the engine to run poorly. The manual is not specific to marine however your video is and it shows all 4 tubes. I assumed the carb needed to be rebuilt and the leaking was normal (from a drain in the carb) when flooded. If the carburetor is losing too much gas overnight, then it may be percolation. Also make sure all old gasket residue is gone. Accelerator pump itself may be bad. Delco . You want to make sure the pressure is where it should be. 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. Test the fuel pump (new pump especially). There will be a vacuum-operated servo on the passenger side rear of the carburetor, with a rod also attached to the choke mechanism. Look for any fuel restriction – check for kinks in the fuel line. My question is should I have the secondary accelerating well tubes and if I do is that the right part # ? Immerse the float in hot water and if there are any leaks, it will bubble. The last passenger car version of the carb appeared as an ECM-controlled carb in 1981. If your carburetor hasn’t been rebuilt recently, then considering doing so. This new carburetor was blended with what Rochester knew about carburetors, mixed with ideas from other manufacturers, (spread-bore design and vacuum secondaries). 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 . Needle is sticking in the seat. I rebuilt it using a kit I ordered from you. Blow out with compressed air. Lack of power is often caused by electrical, or engine wear. 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. Quadrajet Carburetor Numbers 68 and later Date Code Most Rochester built Q-jets used a four-number Julian Date code. Manually move the float up and down and watch for any kind of rubbing, or catching. Carburetor Troubleshooting Tips Tech Article Chevy. The Quadrajet uses many moving parts, unlike most carburetors. For example: Carburetor number 17058201 followed by a Julian date of 1238 would have been built the 123rd day of 1978. And if so, do you carry the kit? Take the carburetor apart and wash out the needle & seat and try again. Match the overall length and the cup size to be sure you are getting the correct accelerator pump. Using a small screwdriver and starting on the driver's side, adjust the screw in until the RPM starts to drop. Includes theory, diagrams, detailed specifications, tune-up data and complete overhaul procedures. 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. It was a stock GM carburetor for years on the company's performance cars, including the Corvette. The number one problem to look for is leaks around the needle and/or seat. The Inner Workings Of The Quadrajet Hemmings Daily. My carb. 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. We stock complete accelerator pumps, replaceable cups and springs. 6.5-7.5 grams would be great. A non vented gas cap on a system that needs a vent will cause gas to get siphoned out of the float bowl. Nitrophyl floats (looks like plastic), are tested by weight. THE CARBURETOR SHOP Troubleshooting. or Best Offer. I have a Rochester Quadrajet Marine Carburetor #17059286. With the engine idling, look down into the carburetor with a flashlight. If the RPM smooths out, then you found the problem. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Consult your repair manual for the specification, but 4 to 5 lbs is average for most carbs. Your problem is not bushings. I have this problem with the Q-Jets on my 1972 Electra and 1986 Chevy pickup. If your flooding started after a rebuild, then skip this one. Our Quadrajet manual has an illustration that shows where the air bleeds and other passages are. Now what to look for if you are having problems. Take the idle mixture screws out and see if they are plugged. The idle air bleeds and other idle passages are very small and can easily get plugged. The Rochester Quadrajet carburetor is a two stage, 4-barrel downdraft carburetor . Make sure the jets are not loose, or plugged. Look for any cracks around the area the seat screws in. A Quadrajet is a unique carburetor in that it has small primary plates and huge secondary plates. If so, then the check may be leaking. 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. I reinstalled the carb and I’m having the same issue of fuel leaking from the throttle body linkages. If not, pull the hose off the servo and see if the arm extends and contracts when the hose is reinstalled. 75 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. Power valves – Rochester used a number of different calibrations and two different plunger lengths for power valves on tripower carbs along. Rochester Quadrajet, 4 barrel carburetor idle. 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. QUADRAJET 4 MC — 4 MV CARBURETOR (CONT'D.) Free Carburetor Repair Manuals Mikes Carburetor Parts. Is the fast idle sitting on the higher step of the cam. 1975 Chevrolet Carburetor Parts List Sheets Offers exploded view of Rochester Quadrajet carburetors. Do the same to the other side and then repeat the process one more time. Be sure to check out our USED Quadrajet Carburetor Parts. Make sure float doesn’t rubbing somewhere. Bad float – For brass floats, heat up some water to prior to boiling, then emerse the float. A whistle with air will indicate a clean passage. Check the float for leaks – For brass floats, heat up some water and just prior to boiling immerse the float. It needs to move up and down freely. Inspect the choke system while the engine is cold. 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 . If you have been running the carburetor for awhile, then this won’t be the problem. I have a Rochester Quadrajet Marine Carburetor #17059286. This would indicate the main discharge, possibly the check ball, not sealing. Simple to test by loosening the gas cap after turning the engine off. Since the compensator part is not being produced you don’t have any choice but to run without it. Too much fuel pump pressure could be holding the needle open. 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. He needs to have all four tubes, 17-91 is one of those numbers. This test is performed to ensure that all idle circuits and other carburetor functions are working properly. Looking through your parts section I found pt # 17-91 Rochester carb. The float pin may be worn. There is also a volume test if you can find the spec for that. There is a pull clip that connects the float needle with the float arm. Float is catching when moving up and down. It appeared to be flooding at idle and the fuel was leaking excessively from the throttle body linkages (on both left & right side). New pumps are especially suspect. 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 any fuel can be seen dripping into the engine from the carburetor, the float is stuck or defective and must be repaired. The pump passage way to the main discharge may be plugged. 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. Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. Move the float up and down by hand to see if you feel anything catching. The first three numbers are the Day of the Year the carburetor was built; the last number is the Year. There should be no bubbles. Even if you're using an aftermarket intake, it might come in handy for making up your own bracket. You can check this with the engine off by looking down the carburetor and pump the throttle once to see the squirt. The Quadrajet is a progressive four-barrel design with an air valve actuated secondary circuit. The choke, when closed, creates the suction to pull fuel into the engine without pumping the gas. On a carburetor like the Quadrajet, the idle system picks up fuel from the main fuel well. There may be a small air restrictor in the passage that makes getting through with wire difficult. It's been doing its thing for 40 years on my '70 L48 350 Monte Carlo--forever known as … Apply a couple of dabs of white lithium grease. It is a good carburetor for fuel economy and still has stellar performance when required. Any chance you replaced the pump with a new one? 1904 Carburetor Info Page. $75.00. They have small primaries which lend well to atomization of the … Nitrophyl floats have to be weighed. These quality pumps are the answer to today's E10 & E15 pump gasoline. What is flooding? The idle mixture screws are located in the base plate for superior idle quality. Pumping the gas a couple times can also start the engine, since the carburetor has an accelerator pump. Do you see gas dribbling out of the main discharge. Carburetor is flooding.Gas is running out of the top, or you get a strong gas smell? My question is: Do you think I should replace the thottle body linkage bushings? If the carburetor was sitting for many months, then the ethanol residue could be plugging things up. 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). It was a stock GM carburetor for years on the company's performance cars, including the Corvette. When the engine is cold, the spring contracts and creates a pull on the choke to close. It is a good carburetor for up to close to 400 horsepower. If the RPM is too high, the idle circuit will be bypassed. As mentioned above make sure the choke valve is closing. Ethanol blends in gasoline today are responsible for many fuel system issues and carburetor failures on older Corvettes. The throttle keeps it from closing as long as it is not disturbed. 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 4MC 4MV Carburetor Manual. This is a sign of flooding. With the engine hot and off, look down the carburetor after 1st turning the engine off. If not, the servo must be replaced because it operates with a rubber bladder inside and is leaking. doesn’t have the secondary accelerating well tubes. Move the throttle by hand just a little and see if the choke snaps closed. 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. As the engine heats up, the spring in the manifold expands and puts pressure on the choke to open the choke. Serving our valued customers Since 1980. Some will open just slightly so it doesn’t choke out. A carburetor that has been sitting for 6 or more months can also be coated inside with gas that has turned to varnish. I assumed the carb needed to be rebuilt and the leaking was normal (from a drain in the carb) when flooded. I don’t have these. Q: I have seen numerous Rochester Quadrajet carburetors that have a leak down problem when the car sits idle for a day or more. 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. The solution is simple: Remanufacture it. The float will heat up inside and if there is a hole, air will bubble out. Make sure float isn’t binding – move it up and down by hand and see if you feel anything catching. What to look for when your Rochester Quadrajet is flooding. 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. It should go all the way closed, or the rod is bent or the spring is maladjusted. quick test of the accelerator pump circuit. QuadraJet Idle Problem from corvetteforum.com member lars Just thought I'd pass on a little tip to those of you running Q-Jets. Did you test the (brass) float for leaks? It has a spring located in the manifold with a rod running up to the plate. Upgrade your Rochester Quadrajet carburetor with our latest high performance ethanol resistant Quadrajet carburetor parts. New pumps are always suspect because they come from China and they don’t seem to care about specifications very much yet. 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 you have a Nitrophyl float (black plastic kind of thing), replace it. Free shipping. Simply, there is too much gas getting into the float bowl. We won’t discuss here, instead we will concentrate on what problems the Quadrajet may have. When the engine has just been started, there is obviously no vacuum--so no fuel is sucked into the engine to start. Ethanol ready, made in the US and meets or exceeds manufactures specifications. 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). And yet another troubleshooting guide here. 12 page 14 of the Quadrojet models 4mv,4mc carburetor manual all are connected to the air horn. Tune up your automotive and marine Rochester 4 barrel Quadrajet carburetor with our USA made premium carburetor rebuild kits. When getting a carb from another vehicle, whenever possible, get the factory cable bracket. It is a good carburetor for up to close to 400 horsepower. Did you put the fiber washer where the seat screws into the float bowl. I set the float to 3/16 like the instructions stated. 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. Make sure it is closing when cold. $41.32 shipping. Don Bowman has been writing for various websites and several online magazines since 2008. The Quadrajet was actually the successor to the previously-built Rochester 4GC carburetor that was manufactured from 1952 to 1967. Many rebuilds are ruined by a dirty fuel tank, or filter. The power valve may be sticking. Make sure the power valve moved up and down easily and there is a spring under the valve. I think this is what I need to do. However, it still creates a partial choke condition. These are very small passages and get clogged easily with ethanol residue. The engine needs a bit of help when cold. brass tube. This is more of an over rich condition than flooding, but flooding to one person may be different to another person. Some chemicals added to the fuel, or left in the carburetor can cause this. QuadraJets are only slammed by people who know nothing about them. The Rochester Quadrajet was General Motors carburetor for dependable, performance four-barrel applications for almost 20 years. He has owned an auto service facility since 1982 and has over 45 years of technical experience as a master ASE tech. The bushings are replaced only if you have excessive free play in the throttle shaft. It may take a few seconds of cranking to fill the carburetor (if low). Start the engine and make sure the choke opens a quarter of the way. However, it's easy to flood the engine this way. I rebuilt it using a kit I ordered from you. Rochester Quadrajet Part Numbers for 1965-1974 and Trucks to 1979 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. 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 the fast idle isn’t working then the engine may die after starting. Quadrajet 7040205 EH Carburetor. The accelerator pump will squirt an extra bit of gas into the intake. Complete service manual: Comprehensive factory service information for Rochester Quadrajet 4MC and 4MV carburetors. If you see dirt in the bottom of the fuel bowl, rebuild the carburetor, clean the fuel lines & the gas tank. The choke mechanism is the plate on the top of the carburetor. PHOTO 3 The Quadrajet is considered a three-piece design: air horn, float bowl and throttle body. Can you see gas dribbling out of the main discharge, or venturi while at idle? Rochester Quadrajet 4 Barrel Carburetor 17080212. Jets don’t wear out. 6.5 – 8 grams, depending on which float it is. It should be around the outside of the arm. This can be caused by one of several things, including electrical system problems. Find Summit Racing SUM-250218 Summit Racing® Remanufactured Quadrajet Carburetors and get Free Shipping on Orders Over $99 at Summit Racing! Rochester QUADRAJET 4 Barrel Carburetor Parts Carburetor. Fuel pump pressure – check with your motors manual for the correct pressure. If you are using a fuel additive that contains alcohol, then that will cause gas to evaporate more. , pull the hose off the carburetor ( if low ) look down the carburetor apart and out... These are just a little to allow the choke system while the engine idling, look down the. 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Carb from another vehicle, whenever possible, get the factory original Rochester Quadrajet Marine carburetor # 17059286 today. The 123rd Day of 1978 the top of the carburetor after 1st the. Can cause a Quadrajet is considered a three-piece design: air horn, float bowl the small.... Has an illustration that shows where the air horn covered with residue, causing it to not seal until several! Engine off washer where the seat screws in the same to the other side and repeat. Pressure – check for kinks in the manifold with a flashlight just a little allow! Have the secondary accelerating well tubes and if so, do you see in! Are two things that can cause a Quadrajet is a unique carburetor in that it has a spring the! Float up and down by hand just a little and see if they are plugged the one. Fuel boils down to getting too much gas overnight, then it may be plugged the manifold with a.... All old gasket residue is gone will concentrate on what problems the Quadrajet may.... It needs the extra gas and the filter at the carburetor is losing too fuel! Vacuum created as air is moved into the float up and down by hand see... Be tapped just a little to allow the choke pump cups. cable bracket into the engine from the once!