I had this same issue. There is an inertia switch located below glove box. Mine went bad. Here is what I wrote to another person with the similar problem:
I have a 2005 Ranger Edge. I had the same problem. I did two things. First I replaced the fuel pump and it worked again for about 2 months. Then it stopped working again so I replaced the inertia switch with a new one from the Ford Dealership. It worked again for about a month. Than it stopped again, so I replaced the wiring that goes from the inertia switch to the main box on the bottom right passenger side. I also put the inertia switch inside the casing on the lower right so it couldn't be kicked. It has been working for 2 weeks now. I hope nothing else happens.
On another note, I had another electrical problem. My speedometer
cluster stopped working and my mechanic found loose wires rubbing against metal on the inside. I think the electrical components on these Ford Rangers are just cheaply made. That is the only thing to check for you now. If it isn't the fuel pump or the inertia switch, just check all the wiring from fuel pump to inertia switch to make sure it is all done correctly. Also check all fuses for fuel pump/inertia switches.
Sometimes I say I and mean a mechanic, I am not a car expert, but would like to be.
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