No code for the fuel pump in any case - There's an access plate in the cargo area to get at the fuel pickup/gauge sender plate on the tank you can remove. There's a fuel pump drive wire in the truck (see fsm) to which you apply 12v+ to make the pump run. You can hear the pump with a stick or hose against the bone behind your ear when the wire is powered up. Old voodoo trick...

Not responsible for advice not taken...