Hi, bought my friends 1998 4.6. It didn't have fuel pressure at the rail when I bought it. I put in a Delphi pump and a new fuel filter. It was parked for a year or so and I have complete trust in him when he says it was running when parked. I also had to install a new battery. I have a HF fuel pressure gauge. Checking at the rail I never get any pressure. The truck cranks and cranks but doesn't start. I hear the pump prime every time. I have - checked and swapped fuses and relays. Checked the inertia switch. Replaced crank sensor. Replaced pressure regulator. All the fuel lines look great from the outside. I don't see any fuel leaks anywhere. I even pulled the ECM just to visually check the board - no leaking capacitors or bad traces. I have just a cheap code reader - no codes detected. I'm completely stumped by it. I have fire at the plugs. It just seems I never get any fuel pressure at the rail...I hear it prime every time. I really don't know what the ECM needs to turn the pump on and stay on vs just a prime? I can jump the relay in the PDB and make it run with a wire/paper clip. The original pump even sounds like it was working when I tested it outside the tank. Thanks for any help!

 

welcome to FTE
hang tight as we have a few resident ford dealer master techs who log in around 0500 edt

 

check the short hose connector that connects the pump motor to the fuel pump hanger inside the tank..might have gotten loose

 

Is there gas in the tank? I can't tell you how many times I've seen folks trouble shoot a fuel problem caused by an empty tank back in my Aero Space days lol.