Why Doesn't Adjusting Idle Mixture Screws Make any Difference? This is an electronic rebuild manual, no physical copy will be provided. A WGD usually has a pump arm like that of a WCFB (IIRC). I have repeated multiple times with same results. It needs about 4 lbs of pressure. Carburetors equipped with an adjustable bowl vent require adjustment. Procedure is as follows: with the throttle lever set screw backed out and throttle valves seated in bores of carburetor, press down on vacumeter link (D) until metering rods bottom at (E). A bushing (sorry dont have size) can be permanently installed in the choke vacuum passage in main body casting provides a more positive seal at this point, and prevents fuel from leaking into this passage on left turns and stalling the engine because of too rich a mixture. Carter WCFB Accelerator Pump Quick test to see if the accelerator pump is working. How to Adjust a Carter BBD 2 Barrel | It Still Runs The Carter carburetor has been around for a very long time. Note te larger box, and the number of additional tools from the 1935 set. Correct by removing any burrs or nicks. Fuel enters the primary side of the carburetor through a strainer screen at the fuel inlet and is directed to the primary needle valve and seat. Adjust by bending throttle connector rod at upper angle (B). The best-selling product Click now to browse 1957 LINCOLN ACCELERATOR PUMP CARTER WCFB FLUORELASTOMER CUP ETHANOL RESITANTIS we ship worldwide cch-rc.com, C $45.04 Free shipping for many products Find many great new & used options and get the best deals for 1957 LINCOLN ACCELERATOR PUMP CARTER WCFB FLUORELASTOMER CUP ETHANOL RESITANTIS at the . When replacing them hold them tight against the wall while tightening the screw. From my experience it is the most complete and comprehensive source for all things carburetor, encompassing a massive spectrum of makes models and applications. All These Part Numbers Interchange Into Our Part No. Test the floats in hot water and if you get any bubbles then they are leaking. As the accelerator is released and the primary throttle plates are closed to the idle position, the upward movement of the pump plunger and attached spring bracket exerts tension on the spring and tends to stabilize the float in a level position. Find many great new & used options and get the best deals for 19571958 Plymouth Fury Carter WCFB Carburetor *Remanufactured at the best online prices at eBay! Did the old gasket get removed? We will contact you as soon as this product is available. Carter WCFB Fast Idle With carburetor installed and engine warmed up. With mineral spirits in the float bowl, Raise the pump. Add a couple drops of oil to the leather. but if it runs well you don't really need to make any adjustments. There should be a retainer keeping the check ball in place. Reinstall carburetor, align and readjust inter connecting rod to manufacturers specifications. Measure from center top surface of pontoons to air horn. Watch this. When that is the case, I bend the accel. Place the choke housing toward the left and remove upper right main body to throttle body screw. As the engine gains in RPM, the vacuum drops and the metering rods are pulled out of the main jet allowing more fuel to flow. Because the float is maintained in a level position, needle valve bounce is minimized and excess fuel entry into the bowl is prevented. Fig. It needs to go up and down easily.Is there aspringunder the power piston?Are the venturi cluster gaskets sitting flat and not curled over? Measure from toe B to air horn. The high speed air bleed and the secondary bleed tube also acts as an anti-percolator. Hold a straight edge across top of dust cover housing, next to the pump arm. Technical Details. The accelerator pump circuit resides on the primary side of. Can't find the answer you're looking for? 1956 Plymouth, Powerflite Transmission - Dashpot The dashpot has been eliminated. Could the float bowl actually be the problem? I have taken this carb a part and rechecked floats adjustments and blown out passages with compressed air thank you. 1956 Chevrolet Corvette & Super Power Kit Engine Idle Speed, Idle Mixture and Throttle Linkage Adjustment Procedure. The WCFB carburetor which came on some of the earliest Make sure the air horn contacts the inner wall of the bowl. Adjusting the WCFB Metering Rods The Carter WCFB, 4 barrel carburetor metering rods are used to meter the fuel getting into the carburetor bore. The lower edge of vent valve cap should be raised above surface of dust cover the distance listed in the. Carter WCFB Rebuild Kit Selection Carter WCFB Build Sheets Carter WCFB Adjustments Carter WCFB 4 Barrel Carburetor Float System Carter WCFB Accelerator Pump BY CARB TYPE GENERAL TROUBLESHOOTING FAQs INJECTORS PURCHASE PARTS MANUALS BLOG Loosen the clamp screw A Press. This circuit provides a measured amount of fuel when needed on acceleration until the vacuum and main circuit can take over. Access our free Idle Speed and Mixture Repair Guide for Chevrolet Corvette 1963-1982 through AutoZone Rewards. The well should fill with fluid. Any bubbles indicates a leak.Make sure the 2 floats are the same height. Carter carburetors fitted with air bleed idle mixture adjustment also have fuel emulsion mixture needles, but these are sealed at the factory to limit the amount of fuel admitted during idle. The accelerator pump circuit resides on the primary side of this carburetor. You cannot go wrong with Mikes carburetor in any way. Check to see that slots in air cleaner gasket line up with vent tubes and do not rotate gasket during installation of air cleaner. Gasket removed. Adjusting the WCFB float level & float drop: The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. No metering rod gauges are necessary. To correct, remove carburetor and turn it upside down. If a loss of rpm is noted, or if the engine dies, and air leak exists. Both valves should be closed. See figure 9F-2. Product information . What Has Been Done to This Carburetor?1. The metering rod adjustment should be done after the pump adjustment. 1957 Desoto Adventurer Loose Throttle Lever Rear Carburetor. This E-manual is pictured with the Carter WCFB carburetor with the upper auto choke. This restricts the flow of fuel. Shorter and smaller overall than the 4GC Rochester, the WCFB was the right choice for dual-quads on a compact . With engine running, check for an air leak at front left corner of carburetor between throttle body and bowl by squirting carb cleaner at this point. Put some fluid in theaccelerator pumpwell and press down on the pump. The manual says to back out the throttle stop screw and hold the fast idle cam in the "choke open" position, then screw in the throttle stop screw until it just contacts the throttle lever arm, then give it another full turn. This restricts the flow of fuel. Can't find the answer you're looking for? Carter WCFB Rebuild kits: Rebuild Kits. Quick test to see if the accelerator pump is working. The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. Once you get the piston out, clean, Carter WCFB Vacuum Piston the cylinder so that the piston move very free up and down. Rebuilding Carter BBD carburetor part 3 - Duration: 5:04. In my repeated attempts to get the accelerator valve to pump, the car has run for several minutes combinedplenty of time to get the float bowl full. Aspringis inserted in the power piston hole, then the piston. Hold throttle valve wide open and close choke valve as far as possible without forcing. Pulloffs : CUFWCFB2 $ 0 . Adjust by bending throttle connector rod at deepest angle as shown. Adjust by bending lip of float, not float arm. BBS) and were basically an on/off condition similar to the function of a power valve. What more could you ask for? The idle mixture screws adjust the amount of air/fuel mixture that goes up to the venturi at idle. Do not depress float lip against spring in needle, but let float rest of its own weight. If not, then find the check ball and make sure it is loose. Clogged idle tube, or passages in the idle circuit. Adjust by bending lip of float, not float arm. Carter WCFB 4 Barrel Carburetor Float System, Engine wont idle, or dies after the choke is opened, or runs better when choke closed. In this video I show you how to replace the fast idle spring on the WCFB carburetor. Can't find the answer you're looking for? Carter WCFB Metering Rods 4,292 views Jul 15, 2018 28 Dislike Share Save Mikes Carburetor 18.7K subscribers https://www.carburetor-part.com is providing this video about the Carter WCFB 4. Make sure the air cleaner gasket does not block the bowl vents. Put a straight edge across the dust cover as illustrated. The single step rods were used on some of the price leader carburetors (i.e. They need to be centered in the bowl.Fuel could be leaking around the needle & seat. Carter WCFB 4 Barrel Carburetor Float System. Look for breaks in the new gasket, or cracks around the threaded area.The needle could have been damaged while adjusting the floats. This is an electronic rebuild manual, no physical copy will be provided. When the engine gets hot and then is shut off, gas can sometimes overheat and then boil. The piston is brass and can be damaged very easily. It isn't unusual for the vacuum piston on the WCFB to become frozen in the cylinder where it resides. Holding the rods down and seated in the bottom (J), revolve metering rod arm until finger on arm contacts lip (K) of vacumeter link. You can also check the adjustment by measuring (F) which should be 18/64. Maximum float buoyancy is generally accomplished when the float pontoons are at a 90-degree angle to the fuel valve. The fuel is also conducted through a passage in the air horn to the secondary needle seat. Older kits 30-70s. Once engine speed gets high enough, the carburetor vacuum is strong enough to pull fuel through the main jet and the accelerator pump circuit is no longer used. Carter WGD Adjustments Float Level With bowl cover assembly inverted and float resting on pin in seated needle, and with gasket removed, the distance from the bowl cover to the top of float should be 7/64. intro Carter WCFB 4 Barrel Carburetor Rebuild Mikes Carburetor 21.5K subscribers Subscribe 51 Share 3.1K views 9 months ago Disassemble & assemble your Carter WCFB 4 barrel. Test the needle by holding it down gently with a brass drift punch. The distance from the dust cover boss to the top of the plunger shaft should be 1/2 inch (distance from base to tip of finger on gauge) (C). Place the choke housing toward the left and remove upper right main body to throttle body screw. Carter WCFB 4 Barrel Carburetor Float System. The Carter WCFB and AFB designs fit easily beneath the low profile C1 and C2 hoods. Notice holes from which linkage rods are removed so they can They work fine when I push hard down on the piston. 1963-64 Studebaker Carter AFB 1962-1965 Chevrolet 327 and 409 engine carburetor manual 1958-1968 Lincoln carburetor manual AVS 1966 Chevrolet 327 and Marine Carter AVS carburetors BB Ball and Ball Single Barrel downdraft manual: 1939-60 Chrysler, Dodge, Plymouth Carter BB, BB1, BB1A and BB1D updraft Carter BB for IHC BBD Free shipping for many products! (note) The metering rods will fit into the jets loosely. Test the fuel pump to be sure it isnt putting out too much pressure. Someone has installed it improperly. Share. Hold air horn upside down with floats in place and gasket removed. Other than that, great company to deal with. Seat the discharge check by tapping lightly in the hole to form a good seal. When the piston is frozen you may have to drill a small hole in the bottom of the float bowl, just under the piston and hammer it out. You may even have to resort to finding a used WCFB carburetor. This can be done by looking at the impression on bowl cover gasket. When closing the throttle, the accelerator moves up in the pump well. Make sure these are clear if you have percolation problems. This check prevents excessive pressure in the discharge passage during acceleration. As the accelerator is released and the primary throttle plates are closed to the idle position, the upward movement of the pump plunger and attached spring bracket exerts tension on the spring and tends to stabilize the float in a level position. The Solid fuel is the later models BBDContents:00:00 intro00:34 air bled adjustments00:37 air bled float setting01:03 air bled fast idle type I01:25 air bled fast idle type II01:42 air bled fast idle type III01:58 air bled unloader02:24 air bled choke vacuum kick03:01 air bled automatic choke03:16 air bled pump04:08 air bled dashpot04:27 air bled idle speed \u0026 mixture04:58 air bled emission carburetors idle mixture06:00 air bled limiter cap06:36 solid fuel adjustments06:40 solid fuel float setting07:03 solid fuel metering rod07:27 solid fuel accelerator pump07:55 solid fuel bowl vent08:18 solid fuel fast idle cam08:43 solid fuel choke pull-off09:12 solid fuel automatic choke09:24 solid fuel egr dump valve09:46 solid fuel unloader10:08 solid fuel high altitude10:28 solid fuel idle speed \u0026 mixture12:11 solid fuel Limiter cap12:37 solid fuel fst idle12:51 solid fuel throttle positioner13:56 solid fuel vacuum throttle positioner14:31 solid fuel sol-vac15:04 solid fuel dashpot15:28 solid fuel transducer While holding the parts as indicated above, rotate the metering rod arm B until the finger on the arm at D contacts the lug on the vacuum piston link C. Primary & secondary float will probably have different measurements. 41-108N Carter 2818S Carter 3059S What Has Been Done to This Carburetor?1. Fuel is puffing out nozzles on primary circuit at idle on primary carb of a dual carb set carbs were just rebuilt what is the cause. DO NOT apply any pressure on the needle. The most complete document I have found. Adjusting the WCFB float level and float drop. Tyler's Forgotten Car Rescue 22,933 views. Seat the intake check by tapping lightly in the hole to form a good seal. As the spring fatigues, the air valve will open too soon, creating an instantaneous lean condition, and a bog. Readjust idle to 500 RPM and fast idle to 1200 RPM On 1955 models set choke two points lean. Rotate throttle stop screw E until engine idle at approx 500 RPM. With choke valve held closed and fast idle adjusting screw C, or fast idle adjusting tang, on high step of cam. I have a 1952 Buick Roadmaster and just rebuilt the Carter WCFB carb, and I'm setting the idle according to the factory manual. When adjusting the screws doesn't change the RPM then it means there is a problem with either the air, or the amount of fuel. FREE to our customers that buy a rebuild kit. With choke valve held tightly closed, take slack out of linkage and tighten clamp screw on choke lever. Anti-Rust "Dichromate" Finish**4. Float adjusted wrong check float level.Float leaking heat up some water and immerse the float. With the thermostatic coil housing gasket and baffle plate removed, crack throttle valve and hold choke valve closed. Make sure the pontoons are centered and will not rub the bowl sides. . Check the low speed jets to make sure they are clear (#44). The vacuum piston is no longer produced and can only be found as a NOS piece, or used. Readjust dashpot plunger to move 1/16 inch on closing of throttle valves. Recheck unloader settings with carburetor on the engine. When I slow down to an idle, my engine runs rough. The discharge check is seated at this time to prevent air being drawn into the pump well. Probably around 4- 4.5lbs. WCFB Carburetor Cutting Out on Left Hand Turn. Carter 2 Barrel BBD Adjustments Mikes Carburetor 21.5K subscribers Subscribe 7.9K views 1 year ago In this video we are going to show you how to do the various adjustments on both the Air. Probably not since only one butterfly is open. a. Change the choke setting to index. Most of the single step rods were steel. Inspiration for this arrangement was provided by the federal government through its exhaust emissions regulations. Be careful removing the intake check retainer. Each float on the float assembly should be at the same height and centered so that they dont rub the side of the float bowl. Use a brass drift punch. The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. Blow through the intake check passage to be sure the passage is open. 19591961 Chevrolet Carter WCFB Carburetor All These Part Numbers Interchange Into Our Part No. Carter built the first successful 4 barrel carburetor, the WCFB (Will Carter Four Barrel) which first appeared in 1953 on Buick cars. See figure 9F-2.A float lifter spring, which is connected to the lever arm of the primary float and to a bracket on the accelerator pump plunger, is incorporated to stabilize primary bowl fuel level and prevent float bounce upon sudden stops, or on rough roads (these springs are nowhere to be found). Place universal pump travel gauge T109-117S (if you happen to have one as they are not available) inverted on edge of dust cover boss of bowl cover. There should now be .018 .023 clearance between throttle valve and bore of carburetor (side opposite idle port). Measure float height as illustrated above. Carter WCFB 4 Barrel Carburetor Float System. If hard starting still exists change the choke setting to one point lean. Coat threads of screw with sealing compound and install it. Make sure manifold heat control valve is free. Back out throttle lever set screw until throttle valves seat in bores of carburetor. On the WCFB the check ball is usually at the bottom of the pump well. Contact Us Home Blog FAQ's Technical Help My Account LoginRegister Examples of Carb Numbers search 0$0 Carburetor Parts by Make & Model Scroll to see more Aero Coach Carburetor Parts Alfa Romeo American Bantam American General American LaFrance American Motors Nash Rambler Auburn Audi Press down on the vacummeter link (H) until the metering rods bottom in the carburetor body (J). Back off the idle screw so that the throttle plates close completely. I. DISASSEMBLY. There should now be 9/64 clearance between upper edge of choke valve and inner wall of air horn. Please complete the fields below to send your friend a link to this product. Rotate throttle stop screw E until engine idle at approx 500 RPM. There may be a blockage in the accelerator pump circuit which would also make it hard to pump.What is the carburetor number so we can make sure you have the correct pump?Polish the pump well with crocus cloth. As the throttle is opened the pump moves down the pump well forcing the intake check closed and forcing fuel out the main discharge. They sometimes need trimming. Can fill the accelerator chamber with a syringe (through top open passages of forward barrels where choke butterfly is) and the jets will spray gas into forward chambers (and will idle and accelerate for about 15 seconds)but when that gas is depleted, the spraying stops. You need to run wire down all small passages. However, it is very similar and I found it very useful. With bowl cover assembly inverted and float resting on pin in seated needle, and with gasket removed, the distance from the bowl cover to the top of float should be 7/64. Check throttle linkage to make sure that primary throttle valves come to full wide open position. Carter WCFB 4 Barrel Accelerator Pump Circuit 3,951 views Jul 13, 2018 33 Dislike Share Mikes Carburetor 20K subscribers https://www.carburetor-parts.com is providing this video about how the. The item you are trying to purchase is currently out of stock.Please enter your name, email, and phone number below. A fuel pump cannot be tested by unhooking the line and seeing if gas comes out. 1956 Plymouth, Powerflite Transmission Dashpot, 1955 Pontiac Loading or Carburetor Flooding, 1956 Pontiac Hard Starting, Partially Warm Engine. They are staked in the hole. Adjust by bending arm (J) on choke trip lever. Other 4 barrel carburetors such as the Carter AVS, Carter TQ, Rochester 4GC, and Rochester Q-Jet have a tensioned secondary spring. Includes theory, diagrams, detailed specifications, tune-up data and complete overhaul procedures. As for the pump not squirting.I suspect the pump well isnt filling up. It should not be opened up. Ultra-Sonic Cleaning3. With choke valve tightly closed, tighten fast idle adjusting screw (K) (on high step of cam) until there is the clearance as listed on carburetor specification page between throttle valve and bore of carburetor, side opposite idle port. Low fuel pump pressure always check you motors manual for the correct pressure. Do not depress float lip against spring in needle, but let float rest of its own weight. Recheck float adjustments. Rotate screw C, or bend tang, until throttle valves are open the distance listed in, With throttle valves held wide open, there should be a clearance between upper edge of choke valve and the inner wall of air horn (. Will Carter introduced the world's first 4-barrel carburetor, the WCFB (Will Carter Four Barrel) which raised air-flow to unprecedented levels. Fast, secure e-book download. Carter WCFB Carburetor Catalog Free WCFB Carburetor Manuals These manuals contain specifications, parts lists and instructions.The manuals can also be used to help identify those carburetors without tags. The flat on top of the pump arm should be parallel to the straight edge. You will need to check your motors manual for the spec, but around 4 or 5 should be plenty. Can't find the answer you're looking for? Ethanol leaves deposits behind that acts like corrosion. Download was not the correct rebuild instructions for my WCFB carburetor, and the correct version was not available. 1: Carter WCFB idle mixture and speed adustment screw location. This allows air instead of fuel to be drawn off the pump jets. Founded by William Carter in 1909, the Carter Carburetor Company produced units such as the AVS, AFB and 385-CFM WCFB for dozens of years. At idle you are at maximum vacuum which makes the metering rods drop down into the main jets. These manuals contain specifications, parts lists and instructions.The manuals can also be used to help identify those carburetors without tags. One of the butterflies is open about 1/8 with the carburetor dis assembled. Fuel enters the primary side of the carburetor through a strainer screen at the fuel inlet and is directed to the primary needle valve and seat. It's highlighted yellow and will look something like this. With rods held in this position, revolve metering rod arm (F) until lip contacts vacumeter link. cm448. The setups data is the same. With throttle valves seated in bores, dust cover and gasket in place. When removing valves they should be marked so that they get put back the same way. Your friend will receive an email from you with a link to our site. Fuel pump working as it should (pulsates and sprays gas each time cam lobe activates it). Make sure there is a check needle below the main discharge. Ultra-Sonic Cleaning3. 57-65 WCFB 1 x 4 carb - Cover only no spring or spring plate CUD3741 $ 4.99 Gasket - Base WCFB 4GC G402 $ 4.95 Flange Gasket G1164 $ 4.95 WCFB Air Cleaner Gasket . Sometimes scraping around the edges with an awl will remove the staking. Press down on vacuum piston link C until metering rods bottom in the carburetor body. The fuel is also conducted through a passage in the air horn to the secondary needle seat. Be sure these ports are clear. Adjust by bending the choke connector rod at lower angle (H). cm448: Ebook carburetor service manual - 341 pages, 272 MBytes, pdf format. Can't find the answer you're looking for? Can't find the answer you're looking for. *New Float6. 1955 Pontiac - Loading or Carburetor Flooding Carter WCFB, 4 barrel metering rod adjustment instructions. 41-98N Carter 2366S Carter 2505S Carter 2555S Carter 2655S Carter 2669S. Make sure the pump relief check is clean. 60 pages of great info. Carter WCFB 4 Barrel Accelerator Pump Circuit Carter BB Carburetor Assembly Part 1 of 2 Rochester Quadrajet Idle Tube Removal Tunning Rochestor Quadrajet 4 barrel Carburetor Mark Osborne. To correct, remove carburetor and turn it upside down. Good quality print. This is percolation. If it is, tap gently with a hammer and the same brass drift punch to seat it, or replace the check weight. Metering rods for the WCFB have been out of production for several years now. The file is in PDF format, you can download and save/print a copy. Fuel enters the primary side of the carburetor through a strainer screen at the fuel inlet and is directed to the primary needle valve and . *New Airhorn Gasket7. The Carter WCFB carburetors have a square-ish body with a rectangular air horn that protrudes above the air. Air Bled has the venturi tube pointing down into the bore. A float lifter spring, which is connected to the lever arm of the primary float and to a bracket on the accelerator pump plunger, is incorporated to stabilize primary bowl fuel level and prevent float bounce upon sudden stops, or on rough roads (these springs are nowhere to be found). b. Outside top of early Carter tool box with correct decal. Manufacturer CARTER : Brand CARTER WCFB : Model Carter 4 BBL WCFB : Item Weight 12 pounds : Country of Origin USA . Though fuel float bowl full, cant get gas into the accelerator pump chamber of the carb. Eckler's Premier Quality Products 57132129 Chevy Carburetor Rebuild Kit Carter WCFB Replacement Kit Includes All Gaskets, Seals, Check Balls, Springs, Accelerator Pump & Needle Valve Read more CARTER 4 Barrel WCFB DUAL CARBURETOR KITS & FUEL FILTERS 1961-65 CHEVROLET 1955-56 DESOTO April 18, 2018 Carter Carburetors Rebuild Kits Float drop not set, or fuel pump pressure too low. They know their stuff and provide technical assistance and guides in both paper and video formats. Kit looked complete but I ordered the wrong one based on the pump and of course with it being opened, it cannot be returned. We use a small bottle type of brush and spray silicon spray into the cylinder while we clean. A balance passage connects the primary and secondary float chambers to provide fuel level control when the vehicle is accelerating, stopping, or rounding curves. Carter WCFB Carburetor E-Manual Download eWCFB, The file is in PDF format, you can download and save/print a copy, FREE to our customers that buy a rebuild kit. Adjust by bending unloader lip on throttle shaft lever. The all-aluminum AFB (Aluminum Four Barrel) was a big innovation in 1957, and lives on today under the Edelbrock name. This spring is a bit complicated so this video will be very helpful when you change your spring.Find this WCFB spring here: https://www.carburetor-parts.com/wcfb-66d400.htmlFind WCFB parts here:https://www.carburetor-parts.com/wcfb-partscontents:00:0000:42 removing fast idle cam assembly00:56 taking the assembly apart piece by piece01:07 removing the old spring01:22 installing spring02:15 which direction does the pieces go?02:38 assembling the pieces03:16 installing the cam assembly onto the carburetor Disassembly2. Carter WCFB Build Sheets Adjust idle screws D to produce a smooth idle of correct speed is obtained. Carter WCFB Adjustments Metering Rod Adjustment Back out throttle screw so that the throttle valve close completly. The cfm of the Carter WCFB four-barrel carburetor is approximately 400. Is there a pointed check weight in the main discharge hole. The Carter WCFB, 4 barrel carburetor metering rods are used to meter the fuel getting into the carburetor bore. WCFB carburetors, althqugh basically all units are allke. Because the float is maintained in a level position, needle valve bounce is minimized and excess fuel entry into the bowl is prevented. Install the pump connector rod (D) in the outer hole, long stroke. The Carter AFB uses weights, and therefore never goes out of adjustment. 1st check to make sure the fast idle linkage isnt holding the valves open. Ideas?? Both Carter and Rochester engineers determined that, on some applications, the float level in the primary side of the carburetor should be different than in the secondary side of the carburetor. A stand pipe is provided at both needle seats as an additional trap for foreign material that might prevent the needle valves from seating properly. The balance passage also tends to prevent flooding in the event one of the needles should temporarily become stuck open by maintaining equal fuel level between the two float chambers. Carter WCFB Accelerator Pump Adjustment The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. The balance passage also tends to prevent flooding in the event one of the needles should temporarily become stuck open by maintaining equal fuel level between the two float chambers. The ends of the connector rod should point to the throttle arm side. Back out throttle screw so that the throttle valve close completly.