Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Pinging on cruise part throttle acceleration?
View Single Post
  #24 (permalink)  
Old 07-12-2010, 06:38 PM
cobalt327's Avatar
cobalt327 cobalt327 is offline
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
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 06:46 PM.
Reply With Quote