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This is a new body style expedition right? If so, pretty sure your mechanic friend is right with 50 psi. Your truck uses a return less fuel system. Both lines off the pump go to one side of the fuel filter into one line coming out. Your fuel rail wouldn't have a fuel regulator, pulsator (no vacuum line). Your pump gets regulated by pump duty cycle from the fuel pump delivery module. FPDM had problems with corrosion. Relay problems in the underhood fuse box.
Hard start sounds like your dropping fuel pressure over night. Loss of pressure under load isn't right either. Leave your gauge hooked up overnight and see what it says. Sounds like a pump problem to me. Ford return and return less fuel systems have different specifications. F150 and Expeditions are not the same in '03.
Yeah, I was totally thinking F150 here. I would really take a minute to pull your Fuel Pump Driver Module before going through the hassle of the pump. Ford bolted that aluminum SOB right up against the steel frame. When salt, dirt, and water get between the two - corrosion ensues. They will work intermittently at times. I think yours should be on the frame back by the spare tire. You'll need to drop the tire to get to it.
The Dorman replacement is really ideal because it includes spacers to get it away from the frame. I actually made spacers for my neighbors, and also painted it.
This is a new body style expedition right? If so, pretty sure your mechanic friend is right with 50 psi. Your truck uses a return less fuel system. Both lines off the pump go to one side of the fuel filter into one line coming out. Your fuel rail wouldn't have a fuel regulator, pulsator (no vacuum line). Your pump gets regulated by pump duty cycle from the fuel pump delivery module. FPDM had problems with corrosion. Relay problems in the underhood fuse box.
Hard start sounds like your dropping fuel pressure over night. Loss of pressure under load isn't right either. Leave your gauge hooked up overnight and see what it says. Sounds like a pump problem to me. Ford return and return less fuel systems have different specifications. F150 and Expeditions are not the same in '03.
Right and right again Ya all has on fuel rail is a damper around cyl #3 which i replaced because i had a discount in my email that was about to expire.
Oh yeah it drops pressure fast. Not even 30secs and its at 0
Now i dont loose pressure under a load tho. Holds 50psi firm. I hit 3k and check engine light flashes thing looses power, i check codes and usually i get p0174 and p0301 are most common. Once in awhile the others i listed earlier on come up.
Will check relay and the FPDM
Originally Posted by white89gt
Yeah, I was totally thinking F150 here. I would really take a minute to pull your Fuel Pump Driver Module before going through the hassle of the pump. Ford bolted that aluminum SOB right up against the steel frame. When salt, dirt, and water get between the two - corrosion ensues. They will work intermittently at times. I think yours should be on the frame back by the spare tire. You'll need to drop the tire to get to it.
The Dorman replacement is really ideal because it includes spacers to get it away from the frame. I actually made spacers for my neighbors, and also painted it.
It's the pump dropping pressure for the hard start concern. Should hold pressure for a lot longer than 30 seconds. The module and the relay won't cause a loss of pressure. New pump and filter should take care of the hard start.
Flashing mil is a misfire problem. Might be a coil/plug issue with #1 cylinder. I'd fix the pump, then re-evaluate the codes and other drivability issues.
It's the pump dropping pressure for the hard start concern. Should hold pressure for a lot longer than 30 seconds. The module and the relay won't cause a loss of pressure. New pump and filter should take care of the hard start.
Flashing mil is a misfire problem. Might be a coil/plug issue with #1 cylinder. I'd fix the pump, then re-evaluate the codes and other drivability issues.
Didn't find FPDM by the spare tire. It might be up on a plastic platform above the spare tire that has a bunch of vent lines going to it and one little power harness.
Yeah it's what I was kind of thinking. Good to have someone else reassure that. Filter is new. New pump will be in next week and I'll go from there. Thanks
It's the pump dropping pressure for the hard start concern. Should hold pressure for a lot longer than 30 seconds. The module and the relay won't cause a loss of pressure. New pump and filter should take care of the hard start.
Flashing mil is a misfire problem. Might be a coil/plug issue with #1 cylinder. I'd fix the pump, then re-evaluate the codes and other drivability issues.
However, the module can cause the pump to take a $4it. That module really needs to be looked at or it could possibly do the same thing to the new pump. I will see if I can find out if it was in a different spot in 2003 than 2006. This is what happens to them.
04-03-2016, 03:03 PM
Ya all has on fuel rail is a damper around cyl #3 which i replaced because i had a discount in my email that was about to expire.
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