captden29 Posted September 9, 2020 Report Share Posted September 9, 2020 if I do a fuel pump pressure test just as the engine is shut down should I expect the pressure to drop to zero? I am told there is supposed to be a bleed hole in the fuel pump that allows this to happen. this is on a 54 Windsor 265 flathead. original pump is rebuilt. thanks skyler Quote Link to comment Share on other sites More sharing options...
soth122003 Posted September 10, 2020 Report Share Posted September 10, 2020 Not sure about the bleed hole on the pump. What I would think would happen is this, As the eng temp heats up when the eng is shut off the fuel in the float bowl will expand and feed into the carb throat thru the idle circuit. As the eng cools down, the fuel left in the bowl will condense with the cooler temp and the float level will drop a bit opening the needle and the pressure will bleed off that way. If there is a bleeder hole in the pump the pressure will drop at that point. Either way, remember the fuel pressure is only about 5 psi and will not really hurt anything. Joe Lee Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 10, 2020 Report Share Posted September 10, 2020 If there was a bleed hole, where would it bleed to? there is no return line back to the tank and if it bled back to the inlet line I imagine the pump wouldn't pump so well? Quote Link to comment Share on other sites More sharing options...
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