1956 Plymouth, Powerflite Transmission - Dashpot The dashpot has been eliminated. Did the old gasket get removed? Check throttle linkage to make sure that primary throttle valves come to full wide open position. Take the top off and put the pump in the well all the way to the bottom. 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 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. Do not depress float lip against spring in needle, but let float rest of its own weight. This is percolation. Be careful removing the intake check retainer. You can also check the adjustment by measuring (F) which should be 18/64. Coat threads of screw with sealing compound and install it. Share. When done you should see very little daylight around the valve. Master Technician Tool Set (early, circa 1935, for 1923~1935 Carter carburetors all makes - most tools then current) Carter Master Technician Tool Set about 1951. 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. 19591961 Chevrolet Carter WCFB Carburetor All These Part Numbers Interchange Into Our Part No. This is an electronic rebuild manual, no physical copy will be provided. To correct, remove carburetor and turn it upside down. 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. but if it runs well you don't really need to make any adjustments. Rotate throttle stop screw E until engine idle at approx 500 RPM. Maximum float buoyancy is generally accomplished when the float pontoons are at a 90-degree angle to the fuel valve. 1955 Cadillac Idle Air Mixture Circuit WCFB Carburetor Cutting Out on Left Hand Turn To correct, remove carburetor and turn it upside down. b. Carter used metering rods with a single step, 2-step, 3-step, and 4-step. The carburetor will flood. One caveatits my impression that the float bowl is full because when I disconnect the fuel supply line from fuel pump (to card), it has pressure on the line. Is there a pointed check weight in the main discharge hole. 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 . A fuel pump cannot be tested by unhooking the line and seeing if gas comes out. On the WCFB the check ball is usually at the bottom of the pump well. This is an electronic rebuild manual, no physical copy will be provided. DO NOT apply any pressure on the needle. When I slow down to an idle, my engine runs rough. How to Adjust a Carter BBD 2 Barrel | It Still Runs The Carter carburetor has been around for a very long time. Loosen the clamp screw A Press. If not then clean it and try again. 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 Carter WCFB Adjustments Metering Rod Adjustment Back out throttle screw so that the throttle valve close completly. Kit looked complete but I ordered the wrong one based on the pump and of course with it being opened, it cannot be returned. With carburetor installed and engine warmed up. Correct by removing any burrs or nicks. Manufacturer CARTER : Brand CARTER WCFB : Model Carter 4 BBL WCFB : Item Weight 12 pounds : Country of Origin USA . WCFB carburetors, althqugh basically all units are allke. Low fuel pump pressure always check you motors manual for the correct pressure. Then close throttle. a. This E-manual is pictured with the Carter WCFB carburetor with the upper auto choke. The cfm of the Carter WCFB four-barrel carburetor is approximately 400. Blow air through the main discharge to make sure the passage is clear all the way to the pump well. Carter WCFB, 4 barrel carburetor manual. Add a couple drops of oil to the leather. Adjust idle screws D to produce a smooth idle of correct speed is obtained. 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. Disassembly2. 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. Blow through the intake check passage to be sure the passage is open. Shorter and smaller overall than the 4GC Rochester, the WCFB was the right choice for dual-quads on a compact . Make sure there is a check needle below the main discharge. Fast, secure e-book download. The Carter WCFB and AFB designs fit easily beneath the low profile C1 and C2 hoods. I have taken this carb a part and rechecked floats adjustments and blown out passages with compressed air thank you. Back out throttle lever set screw until throttle valves seat in bores of carburetor. Carter WCFB 4 Barrel Adjust Float Mikes Carburetor 21.4K subscribers 5.5K views 4 years ago https://www.carburetor-parts.com is providing this video about adjusting the float level and. Piston force is too much for linkage. 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. Fig. With rods held in this position, revolve metering rod arm (F) until lip contacts vacumeter link. I rebuilt a Carter WCFB carburetor with the lower auto choke setup. . This check prevents excessive pressure in the discharge passage during acceleration. The ends of the connector rod should point to the throttle arm side. They sometimes need trimming. Pulloffs : CUFWCFB2 $ 0 . We use a small bottle type of brush and spray silicon spray into the cylinder while we clean. When looking to replace your metering rod keep in mind that Carter used several different lengths of rods in the WCFB. Test the needle by holding it down gently with a brass drift punch. Carter WCFB Accelerator Pump Quick test to see if the accelerator pump is working. Test the floats in hot water and if you get any bubbles then they are leaking. They know their stuff and provide technical assistance and guides in both paper and video formats. Hold a straight edge across top of dust cover housing, next to the pump arm. Anti-Rust "Dichromate" Finish**4. parts. Hold throttle valve wide open and close choke valve as far as possible without forcing. Back out throttle screw so that the throttle valve close completly. 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. 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. 1956 Plymouth, Powerflite Transmission Dashpot, 1955 Pontiac Loading or Carburetor Flooding, 1956 Pontiac Hard Starting, Partially Warm Engine. Can't find the answer you're looking for. Carter WCFB 4 Barrel Carburetor Float System, Engine wont idle, or dies after the choke is opened, or runs better when choke closed. This circuit provides a measured amount of fuel when needed on acceleration until the vacuum and main circuit can take over. There should now be 9/64 clearance between upper edge of choke valve and inner wall of air horn. We will contact you as soon as this product is available. Recheck unloader settings with carburetor on the engine. Note te larger box, and the number of additional tools from the 1935 set. The most complete document I have found. Each size must be used in its own location. With mineral spirits in the float bowl, Raise the pump. Solid fuel has the 2 tubes pointing up. BBS) and were basically an on/off condition similar to the function of a power valve. Carter WCFB 4 Barrel Carburetor Float System Adjusting the WCFB float level and float drop. 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. Please complete the fields below to send your friend a link to this product. Ultra-Sonic Cleaning3. The flat on top of the pump arm should be parallel to the straight edge. Reinstall carburetor, align and readjust inter connecting rod to manufacturers specifications. Adjust by bending throttle connector rod at deepest angle as shown. 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. When Quadrajet carburetors have Carter's basic four-digit identification number before the letter S, the carburetors are aftermarket replacements. This box did not have a part number. 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. Refer to the Adjustment Data Table for adjustment dimensions. The well should fill with fluid. As for the pump not squirting.I suspect the pump well isnt filling up. With the thermostatic coil housing gasket and baffle plate removed, crack throttle valve and hold choke valve closed. Float drop not set, or fuel pump pressure too low. Secondarys are somehow stuck open (which amounts to a vacuum leak). The high speed air bleed and the secondary bleed tube also acts as an anti-percolator. Can you help me out? Adjust by bending lip of float, not float arm. Adjust by bending lip of float, not float arm. The flat surface of the pump arm should be parallel to the straight edge. Technical Details. Using the exploded view on reverse side as a guide, disassemble the carburetor far enough to permit thorough cleaning and inspec tion o! 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 At idle you are at maximum vacuum which makes the metering rods drop down into the main jets. These diagrams include: Fig. Any bubbles indicates a leak.Make sure the 2 floats are the same height. The idle mixture screws adjust the amount of air/fuel mixture that goes up to the venturi at idle. In this video I show you how to replace the fast idle spring on the WCFB carburetor. Test the fuel pump to be sure it isnt putting out too much pressure. With choke valve held tightly closed, take slack out of linkage and tighten clamp screw on choke lever. 1956 Chevrolet Corvette & Super Power Kit Engine Idle Speed, Idle Mixture and Throttle Linkage Adjustment Procedure. Coat threads of screw with sealing compound and install it. Gasket removed as shown A. If hard starting still exists change the choke setting to one point lean. To prevent fuel from being drawn through the pump circuit, the passage to the pump jets is vented by a cross passage to the carburetor bowl above the fuel level. This is caused by side strain on throttle lever due to misalignment and maladjustment of the carburetor interconnection rod. During high speed operation a vacuum exists at the pump jets. 1955 Chevy Hard starting after flooding. Rebuilding Carter BBD carburetor part 3 - Duration: 5:04. The vacuum piston is no longer produced and can only be found as a NOS piece, or used. Some have a coating to give it a better shelf life. Older kits 30-70s. Disassembly2. With choke valve held closed and fast idle adjusting screw C, or fast idle adjusting tang, on high step of cam. Seat the discharge check by tapping lightly in the hole to form a good seal. Rotate throttle stop screw E until engine idle at approx 500 RPM. 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 . When replacing them hold them tight against the wall while tightening the screw. You cannot go wrong with Mikes carburetor in any way. Metering rods for the WCFB have been out of production for several years now. Gasket removed. Make sure these are clear if you have percolation problems. The WCFB carburetor which came on some of the earliest 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. WCFB Carburetor Cutting Out on Left Hand Turn. Because the float is maintained in a level position, needle valve bounce is minimized and excess fuel entry into the bowl is prevented. Carburetors equipped with an adjustable bowl vent require adjustment. The download link will expire in 30 days. You will need to check your motors manual for the spec, but around 4 or 5 should be plenty. 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. Can't find the answer you're looking for? Access our free Idle Speed and Mixture Repair Guide for Chevrolet Corvette 1963-1982 through AutoZone Rewards. Carter WCFB Rebuild kits: Rebuild Kits. features a Carter carburetor identification page and a function that allows you to conduct a search by entering an identification number Factory Carter AFB CFM Ratings Chart Rebuild pics The April 15th, 2019 - The carbs with 1 1 4 venturies and 1 7 16 primary bores and 1 11 16 What more could you ask for? 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. 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. When removing valves they should be marked so that they get put back the same way. Can't find the answer you're looking for? 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. With throttle valves seated in bores, dust cover and gasket in place. Quick test to see if the accelerator pump is working. The fuel is also conducted through a passage in the air horn to the secondary needle seat. The float lifter spring also provides better float and fuel level stability when operating on rough, washboard type roads. I have repeated multiple times with same results. The single step rods were used on some of the price leader carburetors (i.e. Could the float bowl actually be the problem? Someone has installed it improperly. The Carter WCFB carburetors have a square-ish body with a rectangular air horn that protrudes above the air. Adjusting the WCFB float level and float drop. The fuel is also conducted through a passage in the air horn to the secondary needle seat. 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. Outside top of early Carter tool box with correct decal. 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. A balance passage connects the primary and secondary float chambers to provide fuel level control when the vehicle is accelerating, stopping, or rounding curves. Turn knurled nut of gauge until finger on gauge just touches top of plunger shaft (A). Hold air horn upright with floats hanging. Hold air horn upside down with floats in place and gasket removed. To correct, remove carburetor and tighten throttle lever by either peening end of shaft over, or soldering end of shaft to throttle lever. As the spring fatigues, the air valve will open too soon, creating an instantaneous lean condition, and a bog. William C. Carter was born in Union City Tennessee in 1884. If the secondary throttle plate is staying open, then check the primary shaft dog and spring. Product information . Probably around 4- 4.5lbs. Install the pump connector rod (D) in the outer hole, long stroke. Carter built the first successful 4 barrel carburetor, the WCFB (Will Carter Four Barrel) which first appeared in 1953 on Buick cars. (note) The metering rods will fit into the jets loosely. *New Accelerator Pump5. *New Float6. Back out the throttle lever set screw (idle screw) to allow throttle valves to seat in the bores of the carburetor. Measure float height as illustrated above. Aspringis inserted in the power piston hole, then the piston. Do not depress float lip against spring in needle, but let float rest of its own weight. 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 4 Barrel Adjust Float. Press down on the vacummeter link (H) until the metering rods bottom in the carburetor body (J). He only had 5-years of formal education and in 1909, he founded the Carter Carburetor Manufacturing Co in St. Louis. Everyone Has Started an Engine in the . Check to see that slots in air cleaner gasket line up with vent tubes and do not rotate gasket during installation of air cleaner. Adjust by bending unloader lip on throttle shaft lever. 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. They are staked in the hole. Measure from toe B to air horn. Notice holes from which linkage rods are removed so they can Must be made after fast idle adjustment. Also check for overheating of the engine, fuel lines too close to the manifold, or too much heat in the engine department. Fuel pump working as it should (pulsates and sprays gas each time cam lobe activates it). I. DISASSEMBLY. The mixture screw may be bent, or damaged. 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). In this video we are going to show you how to do the various adjustments on both the Air Bled and the Solid Fuel type of BBD carburetors. The metering rods must be installed after the pump adjustment or when leaner than standard rods are installed. Adjusting the WCFB Metering Rods The Carter WCFB, 4 barrel carburetor metering rods are used to meter the fuel getting into the carburetor bore. This eliminates any bog or hesitation when acceleration. 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 . 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. From my experience it is the most complete and comprehensive source for all things carburetor, encompassing a massive spectrum of makes models and applications. The lower edge of vent valve cap should be raised above surface of dust cover the distance listed in the. All These Part Numbers Interchange Into Our Part No. Carter WCFB 4 Barrel Carburetor Float System. Can't find the answer you're looking for? One is in the secondary venturi and the other just above the throttle plate. The ends of the connector rod should point to the throttle arm side. Make sure the pontoons are centered and will not rub the bowl sides. Also make sure one isnt rubbing on the side. 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. Fast Idle or Idle at Cold Start has to be One of the More Important Adjustments on the Carburetor. The setups data is the same. Adjust idle screws D to produce a smooth idle of correct speed is obtained. Make sure the air horn contacts the inner wall of the bowl. 60 pages of great info. Carter WCFB 4 Barrel Carburetor Float System. Check any vents to make sure they are open. 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. Make sure the air cleaner gasket does not block the bowl vents. cm448: Ebook carburetor service manual - 341 pages, 272 MBytes, pdf format. Recheck float adjustments. If the fuel bowl is not filling up enough to fill the pump well, then look at a sticking float needle. The piston is brass and can be damaged very easily. You are flooding (getting too much gas in the float bowl), caused by these types of problems. 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 (. Probably not since only one butterfly is open. Place the choke housing toward the left and remove upper right main body to throttle body screw. They are not meant to fill the hole, only to restrict it. 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). Run a blunt object around the inside of the leather cup to make sure any coating is broken. Watch on. Make sure the ball rattles. You need to run wire down all small passages. It needs about 4 lbs of pressure. Holding the rods down and seated in the bottom (J), revolve metering rod arm until finger on arm contacts lip (K) of vacumeter link. The suction along with the fuel weight pulls fuel through the intake check via the passage to the fuel bowl. It should not be opened up. This allows air instead of fuel to be drawn off the pump jets. Sometimes scraping around the edges with an awl will remove the staking. It isn't unusual for the vacuum piston on the WCFB to become frozen in the cylinder where it resides. The metering rod adjustment should be done after the pump adjustment. Ideas?? 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. cm448. 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. Install the pump connector rod (D) in the outer hole, long stroke. When closing the throttle, the accelerator moves up in the pump well. 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. Can't find the answer you're looking for? 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. 2: Carter AFB idle mixture and speed adjustment screws. 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. Gasket between bowl and base is installed backwards (easy to do). The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. Free shipping for many products! Other 4 barrel carburetors such as the Carter AVS, Carter TQ, Rochester 4GC, and Rochester Q-Jet have a tensioned secondary spring. I purchased from you a rebuild kit for Carter WCFB 4 barrel carb on my 1955 Chev. Carter WCFB Accelerator Pump Adjustment The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. 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. Why Doesn't Adjusting Idle Mixture Screws Make any Difference? Rochester and Carter replacement parts are interchangeable. Your friend will receive an email from you with a link to our site. The all-aluminum AFB (Aluminum Four Barrel) was a big innovation in 1957, and lives on today under the Edelbrock name. Carter WCFB 4 Barrel Carburetor Float System. One of the butterflies is open about 1/8 with the carburetor dis assembled. You should feel some pressure and fluid should not be bypassing the check needle. Though fuel float bowl full, cant get gas into the accelerator pump chamber of the carb. 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. Carter WCFB, 4 barrel metering rod adjustment instructions. Seat the intake check by tapping lightly in the hole to form a good seal. 1955 Pontiac - Loading or Carburetor Flooding 3: Holley 4150 idle mixture and speed adjustment screws. If a loss of rpm is noted, or if the engine dies, and air leak exists. Be sure these ports are clear. The file is in PDF format, you can download and save/print a copy. 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. *New Airhorn Gasket7. Press down on vacuum piston link C until metering rods bottom in the carburetor body. 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. 1: Carter WCFB idle mixture and speed adustment screw location. See figure 9F-2. Back out throttle stop screw until throttle valves seat in bores. You may even have to resort to finding a used WCFB carburetor. This restricts the flow of fuel. This restricts the flow of fuel. Adjust by bending the connector rod at the lower bend (E). The Carter WCFB, 4 barrel carburetor metering rods are used to meter the fuel getting into the carburetor bore. 5:04. Back off the idle screw so that the throttle plates close completely. Adjust by bending throttle connector rod at upper angle (B). Ultra-Sonic Cleaning3. Complete service manual: Comprehensive factory service information (341 pages) for the Carter WCFB carburetor. Hold in place and carefully tighten metering rod arm set screw (G). Once you get the piston out, clean, Carter WCFB Vacuum Piston the cylinder so that the piston move very free up and down. This can be done by looking at the impression on bowl cover gasket. The Carter AFB uses weights, and therefore never goes out of adjustment. Air Bled has the venturi tube pointing down into the bore. Adjust by bending the choke connector rod at lower angle (H). They work fine when I push hard down on the piston. Make sure the pump relief check is clean. Carter WCFB Build Sheets On 1956 models one point rich. The accelerator pump circuit resides on the primary side of. 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. There should be a retainer keeping the check ball in place. Carter WCFB 4 Barrel Carburetor Float System. Some models have a pump relief check in the bottom of the fuel bowl. 1957 Desoto Adventurer Loose Throttle Lever Rear Carburetor. The correct way is to use a fuel pump pressure gauge. Most of the single step rods were steel. Float adjusted wrong check float level.Float leaking heat up some water and immerse the float. Adjust by bending arm (J) on choke trip lever. When the engine gets hot and then is shut off, gas can sometimes overheat and then boil. 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. Ethanol gas does not have much if any lubrication. Blowing out passages will not get them clean enough. Both valves should be closed. As the throttle is opened the pump moves down the pump well forcing the intake check closed and forcing fuel out the main discharge. 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