Probably Not Fuel Pump issue, but Fuel Pump Driver Module
if you have a Ford expedition, and you are pressing on the gas, and are cranking, but unable to start, if you have ruled out the issue to be battery related, it is probable a bad Fuel Pump driver Module. These are installed in the rear of the truck, usually by the spare tire. They are prone to corrosion and rust, and may short out. You may also want to check the relay for a burnt fuse, because the Fuel Pump Drive Module has its own fuse that may blow. If you check the owners manual for the correct fuse, and pull it, and if it is blown, than it is 100% not the fuel pump problem, but the Driver module. If you take the truck to the mechanic then they will not be able to diagnose this and may end up replacing your fuel pump because they think that is the problem.
It is a pretty cheap fix at the Ford Repair, all things considered. The total was $300.00 installed, and on the road in 3 hrs. @