I'm getting ready to install Vans FAB. The instructions (under "O-320 only") speak of an "Accelerator pump", I think which is supposed to be part of the carb. What/where exactly is this pump?? I have a Precision Carb (Model MA-4SPA).
If you look at the last photo here, its the bit on the right hand side. you can see the plunger at the top. At the bottom is the bit that causes you to modify the air filter if I remember correctly.
When you move the throttle forward this injects extra fuel into the carb..
