EFI fuel pressure question
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Joined: Nov 2006
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EFI fuel pressure question
I have a 1988 F150 with a 300 six with EFI. I think I am having fuel pump problems and plan to check my fuel pressure with a gauge I recently bought. Can any one tell me what the pressure range should be with key on - engine not running and engine running? Thanks alot.
Elder User
Joined: Feb 2004
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From: Indiana
Attach the gauge to the fuel rail and without starting the engine just turn the key to the on position (the pump should run for a few seconds) and see what the pressure is. Start the engine and check the pressure. I don't have a manual for that year but it should be around 30 to 35 psi I would imagine. If you unplug the vacuum line to the fuel pressure regulator your reading on the gauge should go up about 10 psi. Thats with the engine running.
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