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I don't think it's pressure. I think the fuel pressure gauge is going wild because there's air in the line.

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My Fuel presure goes to 0 when it sucks air. It is a electric pump.

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but how could a mechanical fuel pump possibly be getting that much pressure built up?

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'S not how electric pumps work. The engine, so to speak, only "cocks" the mechanical pump. The pump stroke is driven by the SPRING in the pump, and is also what determines pump pressure. That's why when you run an electric through a mechanical, the overall pressure doesn't go up---the electric simply drives the pump arm away from the cam, and the pump "floats"

A electric pump may have a 1/16 of a horsepower driving it. Why is it that you don't think a engine that is making 300 horse cannot drive the fuel presure of a mechanical pump to over 7 psi?

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