1990 Ford F-150 Truck wont start

Tiny
LTC050807
  • MEMBER
  • 1990 FORD F-150
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I have a 1990 Ford F-150 4 wheel drive with a 5.8 engine. I was driving it last week it sputtered 2 times and then died and will not start. When I turn the key to the on position I do not here the fuel pump run. I grounded the terminal on the test plug to make the pump run all of the time and nothing. I replace the fuel pump relay and still nothing.I took the cover off of the old relay and manually closed the contacts and the pump runs. I checked the plug for the relay with a VOM and I do not get any power to the coil. What else is in the circuit that could keep me from getting power to the coil of the fuel pump relay.
Thursday, March 26th, 2015 AT 5:01 AM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check the fusible link at starter relay ti's a blue wire coming from a yellow probably use a test light or volt meter should be 12v both ends.
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Thursday, March 26th, 2015 AT 6:06 AM
Tiny
LTC050807
  • MEMBER
  • 3 POSTS
Thanks,
I will check that tonight.
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Thursday, March 26th, 2015 AT 6:39 AM
Tiny
LTC050807
  • MEMBER
  • 3 POSTS
I checked the all of the fusible links and none of them were blown. There was one of them that you could tell that the wire had been hot and the insulation was melted. I replaced it and turned the key and still no fuel pump. I removed the EEC relay and checked for voltage to the coil with the key turned in and I had 12.5 volts. When I plugged the relay back in it smoked the wire on the fusible link that I had just replaced. I think the EEC module it's self is bad?
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Saturday, March 28th, 2015 AT 11:47 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try a new fusible link and a new relay first. I doubt it's the module the relay may have been plugged in backwards
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Saturday, March 28th, 2015 AT 12:47 PM
Tiny
LTC050807
  • MEMBER
  • 3 POSTS
New fusible link new relay same result.
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Tuesday, March 31st, 2015 AT 3:08 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it and see if inertia switch is disengaged. If it is push it closed so pump will work it's on lh side of dash above brake pedal. Then have a pro check your circuit for either a short to pump or switch problem
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Tuesday, March 31st, 2015 AT 5:53 AM

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