i have 1986 f150 5.0 fi with duel tanks .the truck runs until it warms up and then it idles down loose fuel pressure then dies . i replaced the high pressure pump on the frame then the pump in the rea

Asked by grizzly5544 May 18, 2016 at 08:56 PM about the 1986 Ford F-150 XLT Lariat Standard Cab LB

Question type: Maintenance & Repair

the truck runs until it warms up the idles down the looses fuel pressure and dies . I replaced the fuel pump on the frame and fuel pump in the back tank and also the map sensor and still no change .

40,305

James answered 9 years ago

tank switch valve may be problem or pressure regulator at fuel rail most likely

Mark helpful

Tim answered 6 years ago

I once had a car that had vapor lock. I replaced the gas cap with a new one, and the problem went away. Not saying that is your problem, just tossing out another easy enough to try and see if that is the problem.

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i have 1986 f150 5.0 fi with duel tanks .the truck runs until it warms up and then it idles down loose fuel pressure then dies . i replaced the high pressure pump on the frame then the pump in the rea 2 Answers

the truck runs until it warms up the idles down the looses fuel pressure and dies . I replaced the fuel pump on the frame and fuel pump in the back tank and also the map sensor and still no change .

1986 Ford F-150 XLT Lariat Standard Cab LB

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Maintenance & Repair
i have an 88 f150 5.0 new high and low pressure fuel pump it doesnt like to start it cranks and cranks then finally starts it runs great after it starts i think im loseing fuel pressure when the motor 2 Answers

it cranks a lot before starts I think im loseing fuel pressure when motor is off I just don't know where please help

Ford F-150

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Maintenance & Repair
Can anyone help - I have a 1989 F150 xlt lariet 4.9l stright 6. It runs really well till it warms up. I have replaced the following: new low pressure in tank fuel pump - new fuel filter x3 - new compl 3 Answers

Can anyone help - I have a 1989 F150 xlt lariet 4.9l stright 6. It runs really well till it warms up. I have replaced the following: new low pressure in tank fuel pump - new fuel filter x3 - new compl...

1989 Ford F-150 XLT Lariat Standard Cab LB

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Maintenance & Repair
I have a 1989 F150 XLT Lariat with a 5.0 EFI engine. It started sputtering and then died as if it were a fuel filter. So far I have changed the filter, in tank fuel pump, high-pressure fuel pump, 2 Answers

Fuel pressure regulator, and the PCM (had an extra). Fuel pressure wont rise above 23 psi. Will start using starter fluid. With starter engaged battery reads 10.87 volts and 597 amps at battery, ...

1989 Ford F-150

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Maintenance & Repair
I have a 1989 F/150 302, I am not getting power to the High Pressure fuel pump, I am not sure about the low pressure pumps power, I just replaced the saddle in-tank pump to no avail, I did remove the high pressure pump amd confirmed that it was working with 12 volt battery, I am not sure where to go from here, the truck has set for years and was given to me, I really want to get it runnung, does anyone have the quick fix? Thanks 14 Answers

I have a 1989 F/150 302, I am not getting power to the High Pressure fuel pump, I am not sure about the low pressure pumps power, I just replaced the saddle in-tank pump to no avail, I did remove the ...

1989 Ford F-150

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Maintenance & Repair

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i have 1986 f150 5.0 fi with duel tanks .the truck runs until it warms up and then it idles down loose fuel pressure then dies . i replaced the high pressure pump on the frame then the pump in the rea

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i have 1986 f150 5.0 fi with duel tanks .the truck runs until it warms up and then it idles down loose fuel pressure then dies . i replaced the high pressure pump on the frame then the pump in the rea

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