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