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2005 Mustang GT Fuel Pump Fuse Blowing

17561 Views 4 Replies 3 Participants Last post by  bomstang
Hello Everyone:

I am new to the forum :)

I have a Stock 2005 Mustang GT with 27K miles. Last week while driving the car stopped ( the battery/ alternator/inertia switch seemed ok) , basic testing indicated that the Fuse number 41 (fuel pump fuse blew).

I replaced the fuse with a new 20AMP and its working fine now. Originally it had a 15AMP. I have read all the other forms associated with Fuel Pump, Fuel Filter, Intertia Switch in order to figure out the root cause.

Realized it could be two main problems.

1. Fuel Filter gone bad ( which i dont suspect as the car is running with a high Amp fuse without any issues ( its been two days)
2. Shorting in the Fuel pump wiring / Relay.

Has any one had the same problem, Any suggestions why this would happen?
Does anyone have the fuel pump wiring diagram and possible places i should check for shorting.

Any guidance in this will be appreciated.
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Ford Service Manuals - Wiring Diagrams

Scroll down to the fuel system diagram.

Is your spare tire loose or is there water in the trunk? The FPDM is in the trunk on the back wall behind the black plastic cover. Water in there or rubbing in the the trunk though the wiring harness or from a spare tire could wear through the harness.
You could unplug the connector from the FPDM and see if the fuse still blows, and isolate the issue to before or after the FPDM connector. A problem up to/before it would be the wiring through the inertia switch up to the fuse box. A problem after the FPDM would indicate a wiring problem between the FPDM and pump (short or harness damaged), or the pump is froze and wont run (thus drawing too much current).
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