As it would be I have one of the most complicated fuel systems ever manufactured by ford. I have dual tanks, Two in tank low pressure pumps, 1 high pressure pump on frame rail, dual reservoir, selector switch on dash, etc, etc, etc. Everything is new. I completely restored this truck from the ground up. 35 k invested. I got disgusted as well as life got in the way and it has sat for 5 years. I've been troubleshooting the EEC and fuel pump relays (both new and completely rewired into the stock harness). I'm getting fuel at the discharge side of the fuel filter. Its a straight shot to the fuel rail from there. Nothing. I had let someone else do some troubleshooting and he had changed the pressure regulator. Despite it being new, I'm about to run to the parts store and change it out. What else could it be? But the bigger problem is that when I do get it running, it runs rough, and when I try to increase RPM's it stumbles, has no response and backfires and pops. I've been suspecting a MAP sensor wiring issue and started to run new wiring but now finding this fuel issue I am beginning to think it is fuel related. I have new tanks, sending units, supply and return lines are new or clear, new reservoir, HP pump, filter, injectors, you name it. The Ignition system and distributor are all new. I've removed the body wiring harness and the engine wiring harness and checked each wire for continuity. New coil, plug wires and plugs, New PCM, I've done nothing but throw money at this truck. Its a money pit for sure. I've got the motor bonded to the body and frame. I've bonded each fuel tank to the frame. I used heavy duty welding leads with compression connectors to bond everything. So I don't have a bad ground! Help me please I'm losing my sanity. Thanks in advance. Skully