1989 Ford F-150 fuel pump noise

CUSTOMBUILT76

MEMBER
1989 FORD F-150
6 CYL
4WD
MANUAL
10,900 MILES

It seems that after my truck sits for a few hours or more that when I turn the ignition on that the fuel pump on the frame will run for up to like 15 minutes before shutting off so that the truck will start. When truck starts it runs great. I have replace the fuel pump relay and the eec relay (or which ever relay is next to the fuel pump relay) I used FOMOCO relays. These didnt seem to help. I have been told its the computer, the fuel pump, tps, fuel pressure reg, and so on. I s there a plan of attack to use in this situationand if so what is it or if you know what it is that would be a great help.
thank you
greg

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

The plan of attack is check the fuel pressure with the correct fuel pressure tester make sure its within specs though its new and get back with the readings

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Tuesday, December 9th, 2008 AT 8:15 PM

CUSTOMBUILT76

MEMBER
3 POSTS

I forgot to mention that when I push the valve on the fuel line fuel does shoot out but I have not pressure tested it. Thank you

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Tuesday, December 9th, 2008 AT 9:40 PM

RASMATAZ

MECHANIC
75,992 POSTS

It doesn't mean bcuz fuel came out of the valve it has a correct pressure-check the fuel pressure and comeback with the readings-

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Wednesday, December 10th, 2008 AT 7:26 AM

CUSTOMBUILT76

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3 POSTS

I got a pressure tester and tester at a mechanics shop on two cars and he said it reads right. So I tested my truck this morning and it was reading 56 psi constantly. I appriciate the help guys. But whats my next step
greg

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Sunday, December 14th, 2008 AT 7:59 AM

RASMATAZ