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Fuel pumps use alot of juice typically. I bet your electric contacts/switch are burnt. Could be very dangerous, you should install a relay to handle the load.

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I agree 100%, install a relay, & for now, i would disconnect the wiring so it doesn't cause a major problem for you.

Oh, & get a damn good switch, no cheapo stuff, the cheapo's will short out between the contacts when heavy loads are put on them, even though it says it'll handle 30amps, yeah right!!
Also run at least a 10 gage wire.