fuel pump electrical problems

[garagedog369]

I have a 1994 explorer. 4 wheel drive. 4 doors. pulled in my shop to do some muffler work. was going to pull it out and it did not start. relay was working, so thank god it was in a warm shop. did not check for voltage at the pump to begin with. just put in a new pump. well that didn,t work out as well as I hoped. still does not start. no voltage at the pump. the relay is clicking. is there in thing between the relay and the pump that could keep it from working or is this a mater of tracking down the broken wires? thanks for your help. dead in the water.

 

[trashtruck]

there should be a 4 pin electrical connector behind the tank, along the frame that can cause problems

 

[2stroke]

Your inertia cut off switch is tripped. Its under the carpet in the passenger side foot area. Unplug it, then plug it back in. It will start.

 

[FR-425]

Your inertia cut off switch is tripped. Its under the carpet in the passenger side foot area. Unplug it, then plug it back in. It will start.

Yep this Only no plug disconnection needed just push the big red button.

 

[garagedog369]

thanks for the idea. checked the inertia switch. no problem there. I think I tracked down to a faulty ground wire. any one know where that is located on a 94? thanks

 

[2stroke]

So I assume you used a volt meter and found 12 volts at the plug? One prong for red wire, and the other to the frame? If you go from red to black and you get nothing, you probably have a wire that got cut during the exhaust work. If you get something like 8 volts, you have a dirty ground. If you find no power from red to black, but 12 volts from red to ground, I would personally cut the black wire on the truck side of the plug, crimp and solder a ring terminal on, then use a self tapping screw to attach it to the frame. Clean the frame real good and use di-electric grease of course. All the better if you get it in an area shielded from road grime.

 

[garagedog369]

thanks. wil do when I get home.

 

[malohnes]

So I assume you used a volt meter and found 12 volts at the plug? One prong for red wire, and the other to the frame? If you go from red to black and you get nothing, you probably have a wire that got cut during the exhaust work. If you get something like 8 volts, you have a dirty ground. If you find no power from red to black, but 12 volts from red to ground, I would personally cut the black wire on the truck side of the plug, crimp and solder a ring terminal on, then use a self tapping screw to attach it to the frame. Clean the frame real good and use di-electric grease of course. All the better if you get it in an area shielded from road grime.

Great advice!