I need to locate the fuel pump shut-off switch in a 1994 F150 XL 4.9i with alternate fuel system (natural gas). Thanks.

 

on my 96 4.9L my fuel shut off(inertia switch) is located on the passenger side kick panel by your feet. It has a red button you have to pop up, just stick a flat-head screwdriver in the slot and wiggle it for it to pop up.