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A mechanic would check the injectors for voltage and for a ground signal from the computer. The injectors get power from the EEC relay near the battery. The ECM computer gets a signal for the coil and the injectors from the module mounted on the side of the distributor.
fords run two (2) relays for the fuel system one runs the fuel pump and the other runs the injectors so buy one relay and just switch one at a time you will be up and running in no time.Hope this helps you.
check you fuel pressure at the fuel rail, if you have pressure (witch i doubt) then look at injectors, otherwise start with the cheap stuff and work up to others, start with a fuel filter and if that dont help look at a in tank pump or the high pressure pump.
I am hoping this truck is a gas engine. If so probably a 460. The truck has a fuel pump in the fuel tank or tanks if so equipped. There is a fuel rail at the front of the engine that feeds the injectors. On this fuel rail you will see a plastic cap that looks like a cap on a valve stem to a tire wheel combo. Remove this cap, if you turn the key to the on position you should have air out at first and then fuel. Be very careful not to ignite the fuel coming out. Use something to catch the fuel as it begins to come out.
Try squeezing the flexible fuel hose so that just enough fuel gets through to the engine to allow it to run,If you get vehicle to run then its a supply of power to the injectors keeping them spraying large amounts of fuel,pressure relief valve has failed or lost ability to relieve pressure in fuel rail or fuel return line is blocked.Some fuel pumps are capable of supplying excessive pressure but vehicles own relief should be working.Also dirty or unservicable injectors can give you the symptoms you describe.Let me know how you go