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 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 .

2 Answers

31,425

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

10

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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