69 400 w/mechanical fuel pump goes from 5 psi to zero psi after 20 minutes
I posted about this already but through process of elimination I have narrowed the problem down to fuel delivery. Since my last post I have checked a bunch of things including fuel psi and that's where I'm at. When I start the car my fuel pressure gauge reads 5 psi, then I drive around for a while and the car runs great for 20 minutes or so and then it wants to stall, so I pop the hood and check the gauge and it's at zero. My assumption is that the pump is ok but something is happening between the FP and the gauge, which is connected about 6 inches from the carb, and there's about 15 inches of hard line between the FP and the gauge. The hard line is about an inch from the motor.
Is the fuel vaporizing? If so what can I do?
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06-09-2026, 04:06 PM
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