The other day after my truck died on me it was getting a P2291 code. I originally thought my HPFP crapped out. I even had a guy come out and look at it and he thought the same thing even though he barely did any diagnosis on it. It ended up just being air in the fuel line. Before ordering a pump, I decided to cycle the key about 8 times to clear any air out if that might be the issue, and after that, it cranked right up.

I changed both the fuel filters and the water separator valve on the HFCM and never could get the HFCM to push the diesel up to the top filter. I went to the parts store, picked up a new HFCM, and replaced it. Now it will pump the diesel just fine. It has about 5 psi at the fuel cooler. I bled both sides of the cooler until no bubbles. Then I crank it and it will run for about 3 – 5 seconds and shut off. Then it has bubbles again. I start the whole process over and get the same result. I spent most of yesterday doing this.

I think I might be sucking air from the input side of the HFCM from the tank. It sounds like air going into it. I am wondering if there is an issue with the O-ring in that fitting, and if so, is there a way to replace it? Or would it be better to just get some diesel-rated rubber fuel line and hose clamps to replace part of that line? Go back to a place I can cut open to install the hose over it and then on the input of the HFCM.

 

What's your fuel tank level?

 

When it originally cut off on me, I just filled it up. It was close to empty before.

 

I would bet the pickup tube inside the tank has failed.

 

Should the upper fuel filter housing hold fuel? After it fills up, it will drain back down. I am having a hard time getting air out of the system. I had a bad lift pump and replaced it. Every time I bleed the fuel and have no more air bubbles it will crank and then die after a few seconds.
I was bleeding the air again and after no bubbles, I unscrewed the top filter and all the fuel had drained back out of it. I do not think that is normal. Do I need to get a new upper fuel filter housing?

 

I had a bad fuel filter oring and or fuel filter. And yes they were motocraft. I must have gotten a dud. I went into town yesterday morning got another set of filters and changed them. One last ditch effort before calling in someone with more expertise than me. I only changed the upper filter and it's oring. I figured I would try just that one before doing the harder one under the truck. After bleeding the fuel for 10 minutes using Forscan, the truck cranked right up and has not missed a beat.