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The pump can get clogged from sluge in the bottom of an old tank. Has it ever been cleaned out? I replaced my pump, and when it came out it did have sum thick grime stuck to the filter screen. The guys at the base say too much can overload the pump also. One other MV owner found a pinched power line when he took his out for a similar problem. It's really not hard to take out, if the screws break loose ok, just use a sharp spackle knife to lift and save the gasket(or buy one before you start, I was able to reuse mine) then the whole assy. lifts right out. Check the wires. The harness should be clamped to one leg of the housing, But it may have come loose enough to wear through and be shorting as the fuel moves around and the vibrations from the truck shake it. On the outside of the tank is your grounds, check that also. Good luck , hope one of these help you.
