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Old 07-12-2010, 07:38 PM
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cobalt327 cobalt327 is offline
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There are two check valves per accelerator pump circuit in the Holley. One is a rubber umbrella inside the pump chamber (if a newer carb) or a ball retained by a brass bail if an older carb. This works as a one-way valve (along w/the under squirter check) to allow fuel to go out via the accelerator nozzle, and fuel to enter to refill the pump as the pump returns after a shot.

Then, under the squirter there's another needle valve or ball.

The umbrella just gets replaced, the ball and bail can have the seat re-formed by carefully tapping a used check ball into the seat. Same thing for the under squirter check, if needed.

Last edited by cobalt327; 07-12-2010 at 07:46 PM.
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