A fuse won't solve the problem, it'll simply keep the pump from damaging itself.
Unless you fix the underlying problem, you're just gonna keep blowing fuses (although, fuses are cheaper than fuel pumps).
Dunno what the previous owner did, but here's how the wiring ought to run.
+ battery terminal to red wire to the starter solenoid to a blue fused link (looks like a wire with black tape around it) to a yellow wire to the fuel pump relay. Fuel pump relay to orange/light blue wire to the inertia switch. Inertia switch to pink/black wire (T's off to the high-pressure pump) to the in-tank fuel pump. In-tank fuel pump to black wire to ground.
Unless you have/had dual fuel tanks, then it's a little bit different, with a dash switch to select a tank.
So check that wiring, fix it if necessary, and try again. Also, don't run the fuel pump dry, or it will fail quickly.
Also, if you want a fuel pump/kill switch (maybe that's what the previous owner was trying to do) I'd put the switch in the tan/light green wire between the EEC and the fuel pump relay.
Let me know what you find,
Spott