I would try to run a wire straight from a source of power in the rear area, like your rear running lights straight to the power side of the fuel pump wires that exit the tank. Be sure no smell of gas in the area, and you have not opened the gas tank or tried to remove the pump yet. Then turn your lights on, and you will know whether its the relay, or the pump. If the pump primes, its the relay. If it does nothing, its the pump.
I have never done this myself, but read a thread on it by a guy who used his trailer wiring outlet and a section of wire to hot-wire his fuel pump on the trail once when a relay went out.
Good luck and be safe!
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