Just rewire a separate fuel pump relay setup. Get a bosch relay at your local parts stor with the plug. Here is a simple set up that works great. Look at diagram.

bosch relay has 4 wires coming out of it. Its very simple and cheap.

THIS DIAGRAM SHOULD BE ON THE RELAY
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One wire will go to the battery. (fuse) should be between battery and relay. + _/ _ -and the other will go to the fuel pump.

This is how the other wires go. One wire goes to the +IGNITION+ so that when you turn the key on the the electric magnet in the relay will kick on and complete the circuit then the pump will kick on and stay on. For the last wire it goes to a -ground-.

NOTE that I like to put the relay near the fuel pump cover.