On the side of the carb is a rod with an. Well, I'm making some progress. It works perfectly with a vacuum advance distributor. Pick up a rebuild kit and get intimate with it. Offer ultimate engine tuning with total air and fuel metering and adjustment. Titanium Valve Spring Retainers. 00 Includes a doghouse cooler for the best cooling Rebuilt 1776, 1835 or 1915 Dual Port w/ 40mm Kadron Carburetors Outright $4645. Weber Carburettor IDF / IDA Diagrams and Parts list 27 Feb 2015, 06:27 Technical Articles Rod Penrose 3685 views As you would probably know, I have been using both genuine Weber IDF carbys and Weber IDF "style" carbys for many years now and have also recently brought out my own RPR Weber IDF carby range:. Weber IDA, Weber IDF, Weber DCOE or EMPI HPMX Accelerator Pump Exhaust Valves This little check valve is at the bottom of the float bowl. EMPI HPMX Carburettors offer ultimate engine tuning with total air and fuel metering and adjustment. Once done, set the base line according to instructions. On this page you will find all currently available parts for the Weber IDF series carburetors. 055 pump exhaust jet, 50 intake pump jets and 55 mains, but were from a previous Corvair application with a bigger cam. Kit includes early and late style accelerator pump diaphragms 40 44 48 IDF top cover gaskets base gaskets etc. DCOE Accelerator Pump Jets and Washer. Late model IDF's have a spring on an arm with a tiny lock nut that can adjust the amount of stroke applied to the diaphram. If you do not have any fuel flow. Check rule of thumb for idle jet selection in Redline Weber basic idle adjustment instruction. I have ordered several sets of venturis in different sizes. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. The Accelerator Pump Jet has a very small aluminum washer fitted to ensure a correct fit. Weber 32/36 Carburetor Adjustment Weber Carburetor Adjustment Procedure. Keep in mind. Pay attention to STEADY throttle position when testing in these areas! It's easy to confuse the two. 00 Single 44 IDF Weber kit $695. Weber 40IDF is the recommended carb. Rebuild Kit for 40 44 48 IDF Weber Carburetors. No idea how IDA's work but I suppose it is similar. Description. I know the distance from the tip of the accelerator pump threaded portion to the top of the nut is the same for both carbs. WEBER DCOE Pump Rod & Retaining Plate assembly x1. Weber HSR Fuel. The IDF-XE plus series IDF's have separate idle and main circuits featuring changeable air and fuel jets. in fact as i recall most parts interchange. Replace the pump. 6l Empi 43-5725 Accelerator Pump Diaphragm. The accelerator pump on the 48 IDA and DCOE is a brass piston that goes down into its cylinder. This includes the choke, fast idle cam and linkage, and fast idle adjustment screw. 5 mm Float level 5 mm (13/64 ") Adjusting the float level Keep the tank above the vertical so that the weight. I have worked out my flat spot. Our commitment to providing the best parts at the best prices is topped only by our dedication to providing the very best service to our clients. Adjusting screw set for the carburetor idle air needle valve. weber idf accelerator pump adjustment? MotoCarlo Supporting Member. Don't lose that spring beneath the diaphragm. A float level that is too high will cause the engine to run rich and may flood the carburetor with too much gas. Time taken in the setup will provide more fun later. The specified clearance is 10 mm (0. ADVANCE PORT O AIR BYPASS SCREW & JAM NUT IDLE MIXTURE SCREW 1. Check rule of thumb for idle jet selection in Redline Weber basic idle adjustment instruction. 2) Pump well. Try increasing the timing 2 degrees. 055 pump exhaust jet, 50 intake pump jets and 55 mains, but were from a previous Corvair application with a bigger cam. Note: this kit is specifically for vehicles with weber carburetors, mfi or cis injection. "Two barrels" because there are two barrels, and "progressive", because the throttle plates open progressively, not in unison. Pump Adjusting. The accelerator pump jet is installed under a plug between the float bowl and the intake manifold on the DCOE series and 45 MCHH carburetors. Most Critical!. It works perfectly with a vacuum advance distributor. Webers are marketed as having no rubber parts, but the IDF carb has a rubber diaphragm-type accelerator pump. Can someone point me to a post on it or help in this?. Appletree Automotive offers a complete line of VW CARBURETION WEBER REPLACEMENT PARTS. I just go with 00s and adjust using the pump jets/accelerator pump rod. WEBER Carbs. The IDF-XE plus series IDF's have separate idle and main circuits featuring changeable air and fuel jets. ] never come out of the box clean or jetted perfectly for your engine. IDF's, again, were made to take air cleaners. 251: accelerator pump rod spring LONG for HPMX, IDF carbs: 47600. Model number is stamped on the lower carb flange. ( If vehicle has been out of service for an. If you have a mechanical pump, crank the engine over. The IDF-XE Plus series IDF's have separate idle and main circuits featuring changeable air and fuel jets. Adjust the fast idle setting with the engine at operating temperature. For those using the IDF model carburettors, these use a hybrid of DCOE and DGV jets, and as such, we can sometimes run into issues with jetting. Is the accelerator pump squirting when you hit the gas? Is it aiming at the throttle plate gap? ~~~ Here's what Dave did in an attempt to fix the stumbling-on-acceleration problem - Adjusted the accelerator pump for maximum squirt and made sure it was aimed properly (at the throttle plate gap). Find the Carburetor Interior you need and save. My question is, can anyone direct me to a guide that will dumb down the jetting process on this carb? I already backed off the accelerator pump as far as I can but it still fouls spark plugs after about 30 miles. Tuning Dual Weber IDF Carbs on the VW Type 1 Engine A fact - Weber carburetors never come out of the box clean or jetted perfectly for your engine. 40 DCOE Series 18, 22/23, 29/30. Carburetor only, 44 IDF Weber, 1800ccc-2270cc. distributor would eliminate the need for vacuum advance port Weber carb. Weber accelerator pump diaphragm IDF WEBAPDIDF-2 No Tax, Each £16. No man likes a weak squirt. This is for maximum fuel delivery from the accelerator pump circuit. If the main jet doesn't solve it, try the pump. Technical assistance is free for the first 60 days of purchase. Maybe the 38 weber,twin /triple su's , 390 holley. If the pump is working properly, you will see the fuel or water squirt from the accelerator pump nozzles in the carburetor air horn. Size 40 Pump Squirter Exhaust/Bypass/Spill Valve for Weber ICT and IDF, per EACH, 79701. Electric Choke (Loosen ring to adjust) Weber 32/36 Carburetor Adjustment Weber Carburetor Adjustment Procedure. "Two barrels" because there are two barrels, and "progressive", because the throttle plates open progressively, not in unison. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. Jim's web site: Home Z. Before the actual tuning process, let's take a qlook at the various carburetor circuits and what they do: • Cold start circuit. Intermediate jet too small. Tips on how to fix that dreaded Weber Flat Spot / Lean Hole? I adjust my stop screw until it just touches then about 1/8 turn. My engine is a standard x1/9 1500 with a 284 duration camshaft from dbilas. Well, now that you've optimized the mixture curve over normal driving / racing parameters, you have probably virtually The missing piece of the puzzle is the accelerator pump. Appletree Automotive offers a complete line of VW CARBURETION WEBER REPLACEMENT PARTS. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. The IDF is ideal for use on most opposed-cylinder engines, or on engines where the intake ports are nearly vertical. I know the distance from the tip of the accelerator pump threaded portion to the top of the nut is the same for both carbs. The IDF features diaphragm type accelerator pump circuits and ball bearing throttle shafts. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. That should satisfy any A12, even a full racing A12. Check to see if the fuel is old or bad. Accelerator Pump Rods - These are found on the newer Webers, and can drive you nuts if they are not set equally. WEBER DCOE Pump Rod & Retaining Plate assembly x1. More Tuning & Adjustment. Air-Cooled VW Bug, Bus, Sand Rail & Dune Buggy Weber IDF Jetting Guide. WEBER carbs. DCOE Adjustment controls Tuning & Adjustment. " The IDF features diaphragm type accelerator pump circuits and ball bearing throttle shafts. Designed to be used on Berg manifolds with K & N offset or ARPM. · Cold Start Circuit eliminated. 25 Taxed, Each £19. This is for maximum fuel delivery from the accelerator pump circuit. Adjust it by bending the adjusting arm. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. No matter what you're driving, we have the right Weber 50 Dcoe for your automobile. An absolute "must have" for anyone installing or tuning Weber carburettors. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. Repair kits gasket kits and Key repair parts. The accelerator pump on the 48 IDA and DCOE is a brass piston that goes down into its cylinder. The Accelerator Pump Circuit contains additional parts to. It bypasses some of the fuel the accelerator pump fluid BACK to the float bowl, to self adjust the squir. Used to adjust idle speed and to sync carbs. Yeah, good luck with that. See photo below. Top End Performance has been your source for the best prices on brand name, top quality car parts since 1994. FIAT 124 Spider Engine Maintenance + Modification delivered by the accelerator pump is exhausted into bowl (17) along with pump chamber vapors, through the calibrated bush (53). 000 carburetor parts in stock, ready to ship! Dellorto Shop - CarburettorShop - RicambiCarburatori - Carburettor Spare Parts Jets and Service Kits. I am also running 40 IDF's from a 124. WEBER Carbs. We offer a plethora of Weber Carburetor 44 for your vehicle needs. The single hole job is for a 50-cc pump, while the others are used on 30 cc pumps. More Tuning & Adjustment. No man likes a weak squirt. More than 17. Weber Jet Pump Bearing and Seal Rebuild Kit. The only way to get it to run half decent is that I need to have the idle mixture screws turned out 2 1/4 to 2 1/2. I just rebuilt my Weber 32 36. No idea how IDA's work but I suppose it is similar. DCOE Adjustment controls Tuning & Adjustment. The 40 IDF is truly the mileage champ, they are factory equipped with 28mm venturies that help provide a terrific combination of fuel economy and performance. This jet along with the idle mix setting is primarily used up to about 3000-3500 rpm. The piston style is better because it is less prone to problems or wear. 2) Choke linkage binding. Cool, you think, I will just bolt 'em up and run 'em. PMO/Weber Jets, Venturi's, almost ANYTHING for IDA & IDF Webers! Pls note!! Our Partner, PMO cannot ship orders for Carb Parts of less than $35. This is for maximum fuel delivery from the accelerator pump circuit. distributor would eliminate the need for vacuum advance port Weber carb. The motor is a stock 80" evo crate motor, the intake is a split manifold with a downdraft weber idf 40 on it. 00 (Velocity stacks not included) Dual 44 IDF Webers kit. IDF / DCOE / IDA / 38 DGAS Adjustments Addendum to lean Best Idle adjustments Notes and adjustments for IDF and DCOE Carburetors All adjustment procedures are the same as the progressive carbs. Type 1 Weber IDF / Dellorto DRLA bell crank linkage kit; 99010. I can not find anything on this forum regarding what is the correct adjustment for accelerator pump rods on the Weber 44 IDF's. but don't know how to adjust the acc. The IDF features diaphragm type accelerator pump circuits and ball bearing throttle shafts. It bypasses some of the fuel the accelerator pump fluid BACK to the float bowl, to self adjust the squir. Check rule of thumb for idle jet selection in Redline Weber basic idle adjustment instruction. Appletree Automotive offers a complete line of VW CARBURETION WEBER REPLACEMENT PARTS. Should I install an electric pump with regulator and try again, or might it be something in the carb. Wastegate Repair Kit. WEBER carbs. Is there any sort of accelerator pump adjustment on these carbs? I cant seem to find any info about it and this appears to be a common problem on other OT threads. It should have jetting from the factory close to what you need. Weber Standard Bore Replacement Sleeve. Once again, fill the float bowl with fresh fuel or distilled water. Weber carburetor fajs products are most popular in South America, Eastern Europe, and Africa. Parts list: All new parts Pressure plate, disc & t. It provides fuel to the idle mixture screw (responsible for idle supply. 251: accelerator pump rod spring LONG for HPMX, IDF carbs: 47600. No matter what you're driving, we have the right Weber 50 Dcoe for your automobile. It is not until the accelerator is at least 2/3 down that the throttle plate in the second barrel opens. Intake air is metered by changeable centuries and accelerator pump is adjustable for maximum acceleration. 001 Weber DCOE/IDF pump valve weight. The IDF features diaphragm type accelerator pump circuits and ball bearing throttle shafts. 13 Location Of the load sealing plugs (Sec 6) inserting the lead plugs (Sec 6) Fuel inlet Starting ducts 3 Idling duets 5 Accelerator pump duct. Adjust the fast idle setting with the engine at operating temperature. You can find out more about the cookies we use and learn how to adjust your settings, on our Cookie Policy page. "Two barrels" because there are two barrels, and "progressive", because the throttle plates open progressively, not in unison. It took 18 turns. The specified clearance is 10 mm (0. When it comes to adrenaline and speed, you can't beat the thrill of sand cars, dune buggies, street racers, or any custom racing vehicle. It bypasses some of the fuel the accelerator pump fluid BACK to the float bowl, to self adjust the squirt based on how fast you hit the gas. The 40 IDF is truly the mileage champ, they are factory equipped with 28mm venturies that help provide a terrific combination of fuel economy and performance. milo manx 22,619 views. This device should actually give significantly stronger initial throttle response than a constant-depression carb. to the OEM jets and adjust the mixture screws. The piston style is better because it is less prone to problems or wear. The Spill Jet, Weight, & Ball Valve: Figure 60a shows the details of the Accelerator Pump Circuit. Description. If the main jet doesn't solve it, try the pump. One needed per carb. Some tuners advise against the Weber for this reason. Cold start lever (choke) 4. If the vehicle is equipped with an electric fuel pump, test the pump by applying 12 volts and a ground to the pump. Hardly enough can be said about the DCOE. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. The clear fuel filter seems to show sporatic fuel delivery from the pump. Adjust it by bending the adjusting arm. More Tuning & Adjustment. Manually operate the pump lever several times. This is for maximum fuel delivery from the accelerator pump circuit. Before the actual tuning process, let's take a qlook at the various carburetor circuits and what they do: • Cold start circuit. I have ordered several sets of venturis in different sizes. 6l Empi 43-5725 Accelerator Pump Diaphragm. The Accelerator Pump Circuit contains additional parts to. The main issue with the Weber carb on an early model holden is that you will need to convert your accelerator to a cable setup to get the most advantage from the carb, yes it'd be possible to use linkages but it'd be a completely custom setup and more effort than doing a cable conversion. When used with an adapter, the IDF will replace the Solex 40 PII carburetors used on many Porsches. We increase accelerator pump volume / unit time most easily by enlarging the metering hole (this item is as easily accessible as the main and idle jets). Technical assistance is free for the first 60 days of purchase. 40 IDF / HPMX accelerator pump jet - Screwed model - Size 50 on Mecatechnic. For warmer weather, it's recommended to have 0. WEBER CARBURETOR CONVERSION KIT INSTALLATION GUIDE PART # INS -WK551 Page 5 WEBER NA WEBER CARBURETOR INSTALLATION (continued) 2B • screw Do not touch the accelerator and restart engine to check RPM. 43-7316 WEBER 44 IDF Single Carb kit $539. Note: This is the best selling carburetor replacement. Kit is for off-road use, not for use on the highways, or in California. This is a static adjustment made with the top cover off and measured at both high and low. WEBER carbs. Comments: i am installing a weber 32/36 DVG-5-A on a B 20 Volvo. Part of this jet sticks out into the carburetor throat and sprays extra fuel when the throttle is opened, enriching the mixture for acceleration. No Tax, Each £16. · Enlarged Float Bowl, 20% more fuel volume. Intake air is metered by changeable centuries and accelerator pump is adjustable for maximum acceleration. On this page you will find all currently available parts for the Weber IDF series carburetors. Note: This is the best selling carburetor replacement. There is only 4 nuts, a cable and a choke wire to remove the carb to make absolutely sure here. When used with an adapter, the IDF will replace the Solex 40 PII carburetors used on many Porsches. Intermediate jet too small. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. 50 Carburettor service kit: Weber 40/44/48IDF (WE391) 92131905. It prevents the accelerator pump from pushing gas back into the float bowl instead of through the carburetor. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. If nothing squirts from the accelerator pump nozzles, they might be clogged. This jet along with the idle mix setting is primarily used up to about 3000-3500 rpm. Manual Choke 32/36 DGV Weber carburettor. HD KYB: 343144 43-1010, 40IDF Weber 40IDF 113 413 031A 43-1012, 44IDF Weber 44IDF 111 513 031C 113 129 027E Carburetor 211 415 701G Drag Link 113 129 027BR 31pict-1 131 415 811 Tie. but don't know how to adjust the acc. Good Quality China VW Beetle Parts , China Supplier for VW Aircooled Parts Ref. Fitted to newer DCOEs Screws should be seated unless needed to set proper idle. Figure 24: DMS Starting With lever (63) in position A >, butterflies (62) blank the carburetor air intakes whilst throttle (13) opens partially by mean of rod (67) and. DCOE Adjustment controls Tuning & Adjustment. bearing Doghouse fan shroud Doghouse German oil. I just go with 00s and adjust using the pump jets/accelerator pump rod. If you order a set, they may come to you in the ballpark, but every engine is different, even two engines built with the same parts. With a Haynes Techbook, you can do it yourself…from simple maintenance to basic repairs. More than 17. 50 Carburettor service kit: Weber 40/44/48IDF (WE391) 92131905. I have these a 1641 (Ya over kill for this motor but all I have kicking around in the shop). If you have a mechanical pump, crank the engine over. offer ultimate engine tuning with total air and fuel metering and adjustment. Weber 34 ADM conversion If it has a black smoke problem on acceleration then adjust the accelerator pump. Kit is for off-road use, not for use on the highways, or in California. Engine repair or replacement New, rebuilt, repair or complete Machine work, cranks, rods, cams and piston sets Carburetor kits Weber Progress kit from $495. Do NOT confuse accelerator pump adjustments with main jet adjustments! If the engine stumbles when you open the throttle, it could be a pump adjustment, but it could also mean a main jet change. This model is widely used on VWs and Porsche 356/912s. WEBER carbs. The IDF-XE plus series IDF's have separate idle and main circuits featuring changeable air and fuel jets. Wastegate Repair Kit. This carburetor has the late style accelerator pump linkage so will work perfectly with generator or alternator without any modifications. The website Aircooled. CSI Automotive Sales, Service & Parts. On this page you will find all currently available parts for the Weber IDF series carburetors. Basic Carburetor Circuits. Weber IDA IDS Carburetor. Pump Adjusting. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. 6l Empi 43-5725 Accelerator Pump Diaphragm. Setting the float height on a Weber carburetor is important to the proper operation of the engine. The by-pass/exhaust valve in the bottom of the float bowl is used to adjust the accelerator pump volume (not duration) in the early Italian models with the cam actuators. I know the distance from the tip of the accelerator pump threaded portion to the top of the nut is the same for both carbs. how to fix fuel carb pressure pump problem vw manx dune buggy carburetor solex weber - duration: 21:00. Complete Carburetor Rebuild kit for Holley Carburetor with governor on Ford Trucks with 370 and 429 engines. 6, 2000 GT Spider Europe etc. This 44 IDF Weber Carburetor will create maximum horsepower and performance for your Volkswagen. I tried adjusting the timing, but it didn't seem to have much of an effect. The 40 IDF is truly the mileage champ, they are factory equipped with 28mm venturies that help provide a terrific combination of fuel economy and performance. No Tax, Each £16. No matter what you're driving, we have the right Weber 50 Dcoe for your automobile. How to Tune Weber IDF Carburettor is a free how to guide for classic VWs from Limebug #AircooledVWeverything Oil Pump Guides Adjustment if possible should be. A wide variety of weber carburetor fajs options are available to you, There are 204 weber carburetor fajs suppliers, mainly located in Asia. Adjusting screw set for the carburetor idle air needle valve. A poorly adjusted accelerator pump will tend to make the car hesitate under acceleration. The clear fuel filter seems to show sporatic fuel delivery from the pump. Look for plugged filter or clogged lines, bad pump, stuck needle & seat, and fuel pressure. I found that the accelerator pumps on one carb were partially plugged. Disconnect throttle linkage drop links so each carburetor may be independently actuated. The IDF-XE Plus series IDF's have separate idle and main circuits featuring changeable air and fuel jets. No man likes a weak squirt. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. Intake air is metered by changeable venturies and accelerator pump is adjustable for maximum acceleration. Weber Carburetor 40 Idf 44 Idf Genuine Weber Pump Diaphrams Pair 2 47407. The Accelerator Pump Circuit contains additional parts to. If you have a mechanical pump, crank the engine over. 2) Lube with WD-40 and check for something bent. Manually operate the pump lever several times. REDLINE WEBER Kit K610 Chrysler / Mitsubishi with Manual Transmission Using REDLINE Weber 32/36 DGEV These instructions are intended as a general guide for installation. 40 IDF Weber Carburetor. Weber 40IDF Series Carburetors About the IDF • Upgrading • Operation • Installing • Tuning. Figure 24: DMS Starting With lever (63) in position A >, butterflies (62) blank the carburetor air intakes whilst throttle (13) opens partially by mean of rod (67) and. Pay attention to STEADY throttle position when testing in these areas! It's easy to confuse the two. 550 Pump Exhaust Valve Jet w/ Delrin balls,. ** I am sorry we must do this but PMO insists on this practice. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. The IDF-XE Plus series have separate idle and main circuits featuring changeable air and fuel jets. Intake air is metered by changeable venturies and accelerator pump is adjustable for maximum acceleration. A faulty accelerator pump will typically produce a noticeable effect on the engine performance when it fails or is having a problem. The specified clearance is 10 mm (0. 243 Weber IDF 40 & 44 throttle shaft; IDF 48 throttle shaft; Starter jet emulsion tube 85F9; IDF 36 - 40 spindle, Italian type; filter locating ring; Pump jet weight spring; 58300. More Tuning & Adjustment. The IDF-XE plus series IDFs have seperate idle and main circuits featuring changeable air and fuel jets,. The drawing will then open in a new window. WEBER CARBS, Carburettors, Jets, Emulsion tubes, Conversion Kits, Air Filters, Linkages, Rebuild Kits, carbparts. Try increasing the timing 2 degrees. Weber Accelerator Pump Discharge Valve, DCOE, IDF, IDA The accelerator pump dischage valve (also called the intake and exhaust valve) bleeds off some of the accelerator pump output back into the float bowl. The accelerator pump by- pass valve is located in the bottom of the fuel bowl, one is required per carburetor. A good upgrade for slightly modified engines. Buse 34 Main jet 125 Automaticity 200 Idling jet 55 Jet starter 65 Jet pump 35 Pump valve 50 Run pump 10 mm (25/64 ") Float 1. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. On this page you will find all currently available parts for the Weber IDF series carburetors. Check rule of thumb for idle jet selection in Redline Weber basic idle adjustment instruction. · Enlarged Float Bowl, 20% more fuel volume. The IDF-XE plus series IDF’s have separate idle and main circuits featuring changeable air and fuel jets. THE PMO CARBURETOR. net is a fan of the Weber IDF since it has many advantages over other dual port replacement carburetors. 9cc per pump (pump ten times and take the average). When used with an adapter, the IDF will replace the Solex 40 PII carburetors used on many Porsches. Accelerator pump stroke 40 DCOE Series 2, 4, 24, 27, 28, 32, 33 45 DCOE Series 15/16. Weak squirt. On the side of the carb is a rod with an adjustment nut to adjust the accelerator. Progression hole cap. Offer ultimate engine tuning with total air and fuel metering and adjustment. Rebuild Kit includes Weber 32/36 DGV 200 Needle and Seat Assembly, DGV Accelerator Pump Diaphragm Assembly. Weber Idf Or Empi Hpmx Carburetor Idle Jet Doctor Fixes Popping Sound From Clogged Idle Jets from Pacific Customs Unlimited your best source for Street, Off Road, Sandrail, Dune Buggy, Manx, Rock Crawler, Volksrod, or Mud Buggy VW Parts. It bypasses some of the fuel the accelerator pump fluid BACK to the float bowl, to self adjust the squirt based on how fast you hit the gas. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. Do NOT confuse accelerator pump adjustments with main jet adjustments! If the engine stumbles when you open the throttle, it could be a pump adjustment, but it could also mean a main jet change. Maybe the 38 weber,twin /triple su's , 390 holley. Critical! Be sure for initial carburetor set up all air by-pass screws should be in closed position. The Spill Jet, Weight, & Ball Valve: Figure 60a shows the details of the Accelerator Pump Circuit. Repair kits gasket kits and Key repair parts. WEBER Carbs. A defective advance mechanism can also cause bog; as can a defective accelerator pump. Once again, fill the float bowl with fresh fuel or distilled water. Pump Adjusting. If nothing squirts from the accelerator pump nozzles, they might be clogged.