Rebuild a Holley Carburetor
Remove the accelerator-pump cover. Underneath these four screws you’ll find a rubber diaphragm, a short spring, and a small orange rubber check valve. The check valve allows fuel to enter the accelerator-pump cavity, but when the accelerator lever is pushed, the orange check valve prevents the fuel from travelling back up into the float bowl. Your new rebuild kit should include a new check valve.
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