Fuel pump not turning on.

Tiny
JOSHUA123188
  • MEMBER
  • 1994 FORD MUSTANG
  • 158,652 MILES
Fuel pump won't turn on, fuel pump works, I pulled it out and checked it, I swapped the ccrm, checked the fuses, even checked the collision shutoff switch, I think it is a bad ground but I'm not sure.
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Saturday, September 24th, 2011 AT 3:07 AM

24 Replies

Tiny
ASEMASTER6371
  • EXPERT
Did you check for power to the body on the body harness side? It will be a 2 second signal and then off. It will come back on line when the motor is cranking and starts.

Roy
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Saturday, September 24th, 2011 AT 3:13 AM
Tiny
JOSHUA123188
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I'm not sure where to check that.
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Saturday, September 24th, 2011 AT 3:28 AM
Tiny
ASEMASTER6371
  • EXPERT
The body harness where you disconnected the fuel pump. There are several wires there that feed power to the module.

Roy
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Saturday, September 24th, 2011 AT 3:31 AM
Tiny
JOSHUA123188
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No power on body harness.
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Saturday, September 24th, 2011 AT 3:37 AM
Tiny
ASEMASTER6371
  • EXPERT
Ok. Did you check it like I told you? It only comes on for 2 seconds when the key is turned on. Then no power till the motor is cranking and starts.

Check for power to the inertia switch. Same way 2 seconds when key is turned on.

Roy
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Saturday, September 24th, 2011 AT 3:42 AM
Tiny
JOSHUA123188
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Oh, so I need someone to help with that, I'll check and reply as soon as I can.
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Saturday, September 24th, 2011 AT 3:51 AM
Tiny
ASEMASTER6371
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Be back on tomorrow morning

Roy
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Saturday, September 24th, 2011 AT 3:54 AM
Tiny
JOSHUA123188
  • MEMBER
I checked for power at the pump and inertia switch with someone turning the key for me and didn't get power at all at either of them, had him turn the key while I checked with a multimeter.
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Sunday, September 25th, 2011 AT 2:30 AM
Tiny
ASEMASTER6371
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Ok, you need to go to the relay under the hood. Drivers side front, it is a relay with a green connector. Make sure you have power on 2 terminals. One is battery power and the other is key on power.

Roy
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Sunday, September 25th, 2011 AT 2:41 AM
Tiny
JOSHUA123188
  • MEMBER
I can't find any relay with green connectors, my manual doesn't even show one for it, I thought in 94 they put it in the constant control relay module.
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Sunday, September 25th, 2011 AT 3:12 AM
Tiny
ASEMASTER6371
  • EXPERT
If you have that box by the radiator support, then thats where it is. I need to find a diagram for it for you but that unit is a common failure but we need to confirm it before spending the money.

Roy
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Sunday, September 25th, 2011 AT 3:19 AM
Tiny
JOSHUA123188
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I actually already bought a new one and replaced it before I asked the question.
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Sunday, September 25th, 2011 AT 3:21 AM
Tiny
ASEMASTER6371
  • EXPERT
You still need power and grounds verified. You did match the numbers?

Roy
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Sunday, September 25th, 2011 AT 3:28 AM
Tiny
JOSHUA123188
  • MEMBER
I'm not sure what you mean the numbers
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Sunday, September 25th, 2011 AT 3:30 AM
Tiny
ASEMASTER6371
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There are part numbers on the box. There are several different ones but you cannot interchange them. Make sure the part numbers are the same.

Roy
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Sunday, September 25th, 2011 AT 3:32 AM
Tiny
JOSHUA123188
  • MEMBER
Yes I checked the part numbers were the same.
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Sunday, September 25th, 2011 AT 3:37 AM
Tiny
JOSHUA123188
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I'm just at a loss on where to go from here.
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Sunday, September 25th, 2011 AT 11:42 AM
Tiny
ASEMASTER6371
  • EXPERT
You need help. Get it to a shop and have them track it down for you.

Roy
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Sunday, September 25th, 2011 AT 2:44 PM
Tiny
JOSHUA123188
  • MEMBER
I'm sorry I wasted your time I gave the wrong information, the fuse was blown. It's still not working, but it was blown.
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Sunday, September 25th, 2011 AT 9:30 PM
Tiny
ASEMASTER6371
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Its ok. Thats headway. Now, you have to find out why the fuse blew. It blows for a reason.

Roy
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Monday, September 26th, 2011 AT 12:00 AM

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