If it only drops a little, say to 3-4 psi, that's probably just the inlet to the bowl opening.

PS. More pressure is not better. It just needs enough pressure to move the fuel into the bowl so the level is maintained. More moderate pressures reduce the turbulance and foaming of the fuel entering the bowl.
Flood & Drain Fuel Bowls scroll down for a video
Fuel Foaming Talk

Last edited by Mattax; 03/10/18 12:34 PM.