[TR] Fuel pump gone crazy

[ptegler at verizon.net]

the pump only 'spring loads' fuel to the carbs as needed.I don't think the spring even generates 10 lbs of pressure when completely flattened out (compressed flat).
something else mechanical is going on if indeed your readings are correct.ptegler


-----Original Message-----
From: Bud Rolofson <levilevi at comcast.net>
To: Triumphs <triumphs at autox.team.net>
Sent: Fri, Feb 25, 2022 11:38 am
Subject: [TR] Fuel pump gone crazy


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


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