Shuts off while driving

Tiny
RUBEN541X13
  • MEMBER
  • 1989 FORD F-250
  • 7.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
I was driving then the truck started losing power and shutting off. If I let go off the pedal and gets hard to start.
Thursday, August 1st, 2019 AT 6:12 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Ruben,

This sounds like a fuel delivery issue. The issue is you need to determine if this is fuel supply or the high pressure side. You technically have two fuel pumps. One is more of a traditional fuel pump called the supply pump and the other is the injection pump that creates your high pressure.

I would suspect the supply pump diaphragm is leaking because it is driven off the cam. So when you pick up the RPM the pump supplies more fuel.

I attached the information and how to test fuel pressure. Let me know if you have questions. Thanks
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Thursday, August 1st, 2019 AT 7:46 PM

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