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Fuel

Tiny
JOE LANNON
  • MEMBER
  • 1987 FORD F-250
  • 7.5L
  • V8
  • 2WD
  • MANUAL
  • 94,000 MILES
I bought this truck from a guy that couldn't get it running. It's carburated with fuel pumps in the tanks, if I crank it over and over it starts up and runs for a minute then dies. The bowls fill with fuel it starts up then the bowls run dry and it stops. I put new fuel pumps in and it does the same thing.
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Friday, March 4th, 2016 AT 8:35 PM

11 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Check two things, the fusible links coming off the starter solenoid and the oil pressure switch. They both control that feed.

The fusible links are special fuse wire that melts when overloaded. Pull on each wire and see if any stretch. If they do they are burnt and have to be replaced Use ONLY FUSE WIRE to repair this, not regular wire.
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Saturday, March 5th, 2016 AT 6:34 AM
Tiny
JOE LANNON
  • MEMBER
  • 6 POSTS
Thank you, I will try those things.
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Saturday, March 5th, 2016 AT 9:38 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
WHAT ABOUT THE FUEL FILTER, HAS IT BEEN CHANGED?

THE MEDIC
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Sunday, March 6th, 2016 AT 11:30 AM
Tiny
JOE LANNON
  • MEMBER
  • 6 POSTS
I changed the fuel filter already. Still same thing. I'm going to check the oil pressure switch.
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Sunday, March 6th, 2016 AT 1:12 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Make sure you check those fusible links too. One of them powers the running relay. The system starts on one relay and runs on a different one.
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Sunday, March 6th, 2016 AT 1:15 PM
Tiny
JOE LANNON
  • MEMBER
  • 6 POSTS
I did the test on the oil relay switch and the test showed that it was bad.
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Sunday, March 6th, 2016 AT 3:35 PM
Tiny
JOE LANNON
  • MEMBER
  • 6 POSTS
One more time do you think it could be the control module?
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Tuesday, March 8th, 2016 AT 4:10 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
There are no modules in the fuel pump circuit.

https://www.2carpros.com/images/external/42306291.jpg.gif
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Tuesday, March 8th, 2016 AT 4:20 PM
Tiny
JOE LANNON
  • MEMBER
  • 6 POSTS
I am lost.
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Tuesday, March 8th, 2016 AT 4:22 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
You just have to systematically follow the wiring diagram until you find the problem. It's a very basic and simple circuit.
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Tuesday, March 8th, 2016 AT 4:24 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
See if you have power at the end of that diagram, coming out of the Inertia switch. If you do, you can elimate all that and move onto the selector switch.

Here is the diagram for that. it's a little more complicated.

https://www.2carpros.com/images/external/42306311.jpg.gif
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Tuesday, March 8th, 2016 AT 4:30 PM

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