The truck does not run....

2001 Ford F150 v8 Auto Wont start but will crank?

I have replaced the fuel pump relays, the fuel filter and all fuses. I do not know how to check the Fuel Pump Inertia Switch but i have located it. I also know it might be the original fuel pump, but I am trying to get around that one. Any help would be greatly appreciated.

Also, the tank is full, and the truck was left under a carport for the past two days while it rained and was running fine before then.