Fuel pump problem - Ford Mustang Forum

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post #1 of 3 (permalink) Old 03-18-2008 Thread Starter
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Ronnie's Avatar
Joined: May 2007
Location: Wyandotte
Posts: 75
Fuel pump problem

I had my trunk lid off because i was doing some sanding, and it rained a little and got the inside of the trunk wet, now when i turn on the key i cant hear the fuel pump any more, and my car will not start.

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post #2 of 3 (permalink) Old 03-18-2008
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Joined: Dec 2007
Location: Tucson
Posts: 20
Hi Ronnie,

One possibility is...There is a fuel pump cutoff sending unit attached to the left side of the trunk area that cuts the electricity off to the electric fuel pump upon receiving a high g-force input from an accident. Possibly, there is now a short in it since it got wet and is not allowing electricity to flow to the pump. If this is the problem, you can bypass this sending unit to get it going, but you should reconnect it after it dries out. The sending unit is black and about 2"-3" square. Mine, like I said, was close to the left rear of the car in the trunk area. It's been too long since I drove the car, so I can't quite remember exactly where it is, anymore, but this location and description should give you a good heads up. Good luck.


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post #3 of 3 (permalink) Old 03-20-2008
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should be behind the driver side taillight, theres an access hole in the interior, the mustang has the power feed from the solonoid back to the enertia switch, then powers the relay under the driver seat,so if you have no constant power to the harness at the enertia switch, head back to the solinoid under the hood and check fusable links, from the wiring diagrams i have the lincoln mark vii 5.0h.o. the ground signal trigger from the ecm ran through the enertia switch, so they may have change the wiring from model to model or year to year.

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