how much fuel pressure is a 93 century.....

[y2icon]

how much fuel pressure is it suppost to have?

[captain93]

Originally Posted by y2icon

how much fuel pressure is it suppost to have?

good question. i'm wondering how the fuel system regains pressure at all after replacing my fuel pump. any help would be greatly appreciated.

[tbaxleyjr]

Originally Posted by captain93

good question. i'm wondering how the fuel system regains pressure at all after replacing my fuel pump. any help would be greatly appreciated.

35-45 psig with regulator vacume hose attached, 40-50 psig with regulator vacume hose discionnected and plugged.

The fuel pump has an electric priming circuit which starts the fuel pump as soon as the ignition switch comes on.

Once the lube oil pressure reaches 6 psig, the oil auxiliary contacts on the oil pressure sending unit pulls in the fuel pump relay for normal system operation.

The fuel pressure regulator controls the pressure by bypassing fuel back to the fuel tank if it is not needed to feed the injectors. under start-up, the injectors are calling for very little fuel and there is little vacume calling for the regulator to bypass thus the pressure increases (similar to blowing into a drinking straw with the end blocked)

[captain93]

Originally Posted by tbaxleyjr

35-45 psig with regulator vacume hose attached, 40-50 psig with regulator vacume hose discionnected and plugged.

The fuel pump has an electric priming circuit which starts the fuel pump as soon as the ignition switch comes on.

Once the lube oil pressure reaches 6 psig, the oil auxiliary contacts on the oil pressure sending unit pulls in the fuel pump relay for normal system operation.

The fuel pressure regulator controls the pressure by bypassing fuel back to the fuel tank if it is not needed to feed the injectors. under start-up, the injectors are calling for very little fuel and there is little vacume calling for the regulator to bypass thus the pressure increases (similar to blowing into a drinking straw with the end blocked)

thanks for the reply but it ended up being the inertia switch. not really a switch but i had to unplug and replug a wiring harness inside the trunk to reset the fuel system. works like a charm