Fuel pump not turning on.

1994 FORD MUSTANG
158,652 MILES
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JOSHUA123188
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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.
Sep 23, 2011 at 8:07 PM
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ASEMASTER6371
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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
Sep 23, 2011 at 8:13 PM
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JOSHUA123188
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I'm not sure where to check that.
Sep 23, 2011 at 8:28 PM
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ASEMASTER6371
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the body harness where you disconnected the fuel pump. there are several wires there that feed power to the module.

Roy
Sep 23, 2011 at 8:31 PM
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JOSHUA123188
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No power on body harness.
Sep 23, 2011 at 8:37 PM
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ASEMASTER6371
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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
Sep 23, 2011 at 8:42 PM
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JOSHUA123188
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Oh, so I need someone to help with that, I'll check and reply as soon as I can.
Sep 23, 2011 at 8:51 PM
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ASEMASTER6371
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be back on tomorrow morning

Roy
Sep 23, 2011 at 8:54 PM
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JOSHUA123188
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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.
Sep 24, 2011 at 7:30 PM
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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
Sep 24, 2011 at 7:41 PM
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JOSHUA123188
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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.
Sep 24, 2011 at 8:12 PM
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ASEMASTER6371
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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
Sep 24, 2011 at 8:19 PM
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JOSHUA123188
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I actually already bought a new one and replaced it before I asked the question.
Sep 24, 2011 at 8:21 PM
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ASEMASTER6371
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you still need power and grounds verified. you did match the numbers???

Roy
Sep 24, 2011 at 8:28 PM
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JOSHUA123188
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I'm not sure what you mean the numbers
Sep 24, 2011 at 8:30 PM
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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
Sep 24, 2011 at 8:32 PM
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JOSHUA123188
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Yes I checked the part numbers were the same.
Sep 24, 2011 at 8:37 PM
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JOSHUA123188
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I'm just at a loss on where to go from here.
Sep 25, 2011 at 4:42 AM
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ASEMASTER6371
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you need help. get it to a shop and have them track it down for you.

Roy
Sep 25, 2011 at 7:44 AM
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JOSHUA123188
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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.
Sep 25, 2011 at 2:30 PM
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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
Sep 25, 2011 at 5:00 PM
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JOSHUA123188
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I checked for voltage when the key was turned on and, I'm getting 4.2 volts at the body harness.
Sep 25, 2011 at 8:08 PM
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ASEMASTER6371
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no good. has to be at least 12 volts. i am going off for tonight be back tomorrow morning

Roy
Sep 25, 2011 at 8:19 PM
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JOSHUA123188
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Fixed it, the connector comings from body harness to pump was bad.
Sep 26, 2011 at 10:41 AM
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ASEMASTER6371
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good job

Roy
Sep 26, 2011 at 10:51 AM
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