Fuel Pressure

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Feb 19, 2004 | 12:15 PM

island89

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Joined: Feb 2004

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Fuel Pressure

My 89 F150 Is not running as well as Id like to. I have changed out the ECM and its running better. when I drop it into gear it tends to stall I need to know this

when the engine is off ignition on the fuel pressure is 45lbs.

Does it need to remain at 45 lbs while running

or what????

I need ECM info

Chris

Feb 19, 2004 | 01:56 PM

frederic

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Joined: Oct 2003

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From: New Jersey

Yes, 45 psi minimum at all times. If its dropping, your fuel pressure regulator is bad.

Feb 19, 2004 | 03:17 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,555

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From: Concord, NC

Best I remember, at idle it should go down to around 35 psi due to the vacuum on the pressure regulator.

Feb 19, 2004 | 03:23 PM

nd4spd

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Joined: Mar 2003

Posts: 306

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From: Mobile, ALABAMA

If my fuel pressure regualtor is bad, could that cause my truck not to start up, and the pump not to prime? if not i know for sure that the fp is bad, the relay is good also