211Racing wrote:
That would be a good guess, but it's fuel injected. 5.4 V8.
Thinking I've got a vacuum issue. Might need to trace the vacuum line back to the engine and see if I loosened a fitting when I was lowering the tank the first time and didn't know all the lines were so darn short.
Working against that theory is the fuel gauge on the dash not registering the 8 gallons of gas I added before starting it up. Still read empty. Still had a "LOW FUEL" light on the dash. The new Delphi Fuel Pump looked and read to be an exact replacement. That's why I chose to replace it completely rather than rebuild the original pump. Other than the "LOW FUEL" light, it is not showing a "CHECK ENGINE" light. I will replace fuses today and see if I can get everything powered up again. Have a Foxwell scanner I just updated with all things FORD. Will see what that shows.
Well you have made some progress, graduating from spraying starting fluid from a can.
Check the fuel rail pressure, typically on 5.4s it should be 40 PSI take or give 5 PSI.
To high or too low and the engine isn't going to run right and could be the pressure modulator (regulator) as Ford calls it. This could be a mechanical regulator or electronic, not sure on that. 2004 up to 2008 they used a electronic control mounted around the rear axle on pickup trucks.
"pumping" shouldn't make a difference typically but doing so you are adding extra air (WOT) and altering the throttle plate sensor reading and computer will alter the injector timing to allow more fuel or less fuel.
2002 5.4s have a very "basic" crude OBD2 system implementation with minimal sensors and data which tends to make troubleshooting less automated and more hands on. Basically it is the equivalent to OBD1 but with a OBD2 connector. I no longer have a 2003 so I can't verify if the OBD2 system has fuel pressure reading for the earlier yrs.
