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1990 Ford F-650 no run, starts

Tiny
STEPVAN1984
  • MEMBER
  • 1990 FORD F-650
  • 7.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 55,000 MILES
I changed the fuel pump external electric. What its doing is it will start with difficulty then run for a couple of mins then die. When I race engine and put into gear it will go for a little then it dies. Its getting fuel as I can see it in the carb and I had friend check to see if fuel pump was turning on it is. Any thoughts where to start looking? Thanks don
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Friday, May 9th, 2014 AT 5:54 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Don:

Is this vehicle fuel injected? You mentioned seeing gas in the carb. Have you checked to make sure fuel pump pressure is within the manufacturer's specs? Was the fuel filter replaced when the pump was?
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Friday, May 9th, 2014 AT 7:19 PM
Tiny
STEPVAN1984
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  • 8 POSTS
Yes filter and pump replaced, no its not fuel injected. Just changed pump and filter today.
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Friday, May 9th, 2014 AT 8:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Does it have a square control module about 4" x 4"?
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Saturday, May 10th, 2014 AT 3:49 PM
Tiny
STEPVAN1984
  • MEMBER
  • 8 POSTS
Yes that ma be the problem what I did is to run a wire from pump to inline fuse 15 amp then to fuse box onto a lead that's hot when key on not when key off. Seems to run ok now will have to drive it tomorrow to check it. What's your theory?
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Saturday, May 10th, 2014 AT 6:20 PM
Tiny
JACOBANDNICKOLAS
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That leads me to believe there is a problem with the power supply to the pump. Try it tomorrow and let me know how it runs. Have you tried switching the fuel pump relay?
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Saturday, May 10th, 2014 AT 6:35 PM
Tiny
STEPVAN1984
  • MEMBER
  • 8 POSTS
Cant find it, have no owners manual just chiltons and it doesn't say where its at.
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Saturday, May 10th, 2014 AT 8:10 PM
Tiny
JACOBANDNICKOLAS
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There should be a relay box under the hood. Usually it is on the passenger side of the inner fender.
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Sunday, May 11th, 2014 AT 12:52 PM
Tiny
STEPVAN1984
  • MEMBER
  • 8 POSTS
I test drove it and it ran fine. Still not finding a relay so I think ill just leave it like it is for now, when I get some extra $$$ ill take it to shop. Thanx for your help.
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Sunday, May 11th, 2014 AT 3:13 PM

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