Fuel pump runs with external power, but wont run off the truck. Truck will fire on starting fluid, no fuel at the rail. Replaced pump relay, frame rail fuel pump and ignition module already. Prior to the problem, I flushed the anti-freeze and washed under the hood with a hose. The truck started and ran several times that day after the flush with no problems, then later that day it wouldnt start.
There is a fuel pump reset switch under the dash near the lower heat ducts at the floor.i think on the drivers side but it has been a long time since i done this.
SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
SOURCE: 1987 F 250 fuel pump circuit problem
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SOURCE: Fuel Problem
fuel pressure regulator? This diverts excess pressure from the rail back to the tank. When they wear out they usually stay stuck open thus diverting all pressure back to the tank. Pressure tests do not reveal this as pressure is checked before the rail not in it. I do believe you have a bad fuel regulator. They are 75US ouch.
SOURCE: Fuel pumps will not run!
Hey lets try this ! Locate your starter solenoid & look for a yellow wire marked with a "W" . That may be the fusible link for fuel pump. Let me know what you find.
SOURCE: Intermittent fuel pump engagement when turning key - 2001 Taurus
try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.
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