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Is there a fuse or relay connected to the fuel pump on 2004 dodge 3500 diesel?

Yes, there is both a fuse and a relay associated with the fuel pump on a 2004 Dodge 3500 diesel. However, the exact location and specifics (fuse amperage, relay number) will depend on the specific engine (Cummins ISB, ISB-HD, or possibly a different engine) and whether it has a lift pump or not.

You'll need to consult your owner's manual. This is the definitive source for the location and specifications of all fuses and relays in your vehicle.

The owner's manual will have a fuse and relay panel diagram showing the locations and functions of each. The diagram should clearly show which fuse and/or relay are responsible for the fuel pump circuit.

Without knowing the specific engine type and having access to your owner's manual, I cannot give you the precise location. Searching online for "2004 Dodge 3500 [Your Engine Type] fuel pump fuse" or "2004 Dodge 3500 [Your Engine Type] fuel pump relay" might yield some results from forums or repair manuals, but always double-check against your owner's manual.