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1999 Ford F-150 electrical or fuel problem

Tiny
RICKAGUINIGA
  • MEMBER
  • 1999 FORD F-150
  • 0.5L
  • 4WD
  • AUTOMATIC
My truck will run fine when it has sat for a while, but if ran for long periods it will start to lose power, slow acceleration, and will drop rpms and eventually die. When it reaches that stage it will start but soon die.
Thursday, September 3rd, 2015 AT 8:15 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Based on your description, it sounds like you're slowly losing fuel pressure. You can verify that by attaching a fuel pressure gauge to the test port, and clipping it under a wiper arm so you can watch what happens when the problem occurs. If the pressure does start to drop after driving a while, but the engine runs okay after stopping it for a few minutes, a real good suspect is the pickup screen in the gas tank. They can collapse after a while and block fuel flow, then stretch out again after sitting a few minutes.
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Thursday, September 3rd, 2015 AT 9:23 PM

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