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Why is there only 6 volts comming out of the fuel relay?

Tiny
RICKB
  • MEMBER
  • 1994 FORD F-150
I have a ford f-150 1994 300 6cyl 4.9L fuel injected twin tank truck, yester day while driving it just shut off, I hot wired the fuel pumps they work fine, I replaced the fuel relay, truck still won't start, 12 volts going into the relay but only 6 volts comming out, pumps need 12 volts to work, do you know whats wrong?
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Tuesday, July 24th, 2012 AT 10:39 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Disconnect pump and see what the voltage is. The pump may be bad pulling down the voltage.

Roy
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Tuesday, July 24th, 2012 AT 10:42 PM
Tiny
RICKB
  • MEMBER
  • 1 POST
With that done, there is only 6 volts comming out of the fuel relay
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Tuesday, July 24th, 2012 AT 10:53 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It may be a bad relay but before replacing it, disconnect the inertia switch and measure as well.

Roy
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Wednesday, July 25th, 2012 AT 12:21 AM

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