[TR] Fuel pump gone wild

[Bud Rolofson]

Listerati,

What could happen to make my Spitfire mechanical fuel pump start pumping excessive fuel pressure? I tried two different vacuum gages inline to the fuel line between the pump and the carbs and they both showed over 10 psi (maxed the gage actually). That overwhelms the float needle valves and makes the carbs flood making the engine barely idle and die if I try to increase the rpm’s.

I guess I don’t know enough about how fuel pumps limit fuel pressure internally. Is there something internal to the pump that could fail? Maybe one of the round valves?

I also tried inline fuel pressure regulators (three different ones) but it didn’t seem to faze the high pressure. That was puzzling also.

Once it warms up a little I’ll try a spare pump.

Thanks
Bud


Sent from my Commodore 64 Sent from my Commodore 64