There are four screws that hold the fuse ox to the underside of the dash. The second thing was that the fuel pump relay is built into the fuse box and is not readily serviceable. In this case there was a complaint of an intermittent engine stalling condition so that meant the issue was related to the fuel pump relay. If the code P0231 was stored and there was no performance problem with the fuel system the problem could be in the wiring between the fuse box and the PCM. One wire goes to the fuel pump via the inertia switch and the other goes to the PCM. Number one is that when the fuel pump relay is engaged it supplies power to two different wires. Studying a wiring diagram showed several things. Testing found a code P0231 stored which indicates a problem with voltage to the fuel pump. This 2004 Ford F250 with a 5.4 liter gas engine came in with the complaint that the engine would occasionally stall.
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