fuel pressure

[drayrunner]

can someone tell me how much pressure a unregulated fuel pump make for a 02 3100 Malibu. thanks

[robertisaar]

unregulated? so basically maximum pump pressure possible?

[drayrunner]

yes, that is correct, max pressure fron a factory pump.

[geoffinbc]

You can find out by putting a gauge on it and clamping a rubber part of the return line. I would guess around 70PSI. But remember this will put a big load on the motor and possibly stall the pump so don't make it a common practice.

[js35]

Most fuel pumps I have "dead headed" as described above usually put out around 80-90psi, I believe there is a pressure relief built into the pump.

[robertisaar]

i seem to remember reading something from GM stating around the 70 area before that valve is supposed to pop open....

either way, the stock pump won't be putting out a whole lot of flow at that pressure.