Fuel Pump fuse keeps blowing HELP

Aug 25, 2007 1 Replies

I have a 2000 740i



Just a couple of days ago the fuse located back where the battery is for the fuel pump keeps blowing.



Does anyone know what could be causing it?



Thanks in advance!!!!!



Jeff


You have a short.

Either the power wire between the fuse and the pump motor is worn through, or a winding in the motor itself is shorted. The motor could be drawing a heavy load which requires more current than the fuse can accomodate. Given these choices, my money is on the pump needing to be replaced.

To test the wire, remove the fuse and unplug the motor, then test with a multimeter to see if there is continuity to ground. The answer should be no continuity.

There ought to be no other load on the fuel pump circuit, but if you bought the car used, this might not be true any longer, and the auxiliary circuit might be causing the problem.

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