Join Date: Aug 2007
Location: Pearland TX
Feedback Score: 0 reviews
Air in fuel lines, stalls, happens again!
Next chapter in my apparently unending saga...
I get air in the fuel lines when the truck is running. Yeah. I can let it idle for three to fifteen minutes, and it will eventually start straining and stall. I have a fuel pressure gage hooked up to the passenger side test port - pressure remains constant at 55 psi so I know it's not the pump (and it will drop when I purge the system, and come back up when I close it, so it's not the gage).
I have half a tank of fuel. so I know it's not the fuel pickup falling apart. Additionally, not running, I can open the test port, turn the key to turn the fuel pump on, and after it blows out the air it will send a solid shot of fuel. It's definitely got a good pickup in the tank.
She started doing this a couple of weeks ago. Messing around yesterday, I found that the sheet metal nut that holds the spacer on the IPR had fallen off and the IPR was loose on the solenoid. I replaced it, but it's possible the HPOP went over pressure and blew a seal somewhere. There's no obvious leaking on the exterior though.
I was able to diagnose and replace a couple of underperforming injectors, but that did not resolve the issue.
What happens is I start it up, it runs fine for several minutes with no indication of problems. Then she slowly sounds like she's straining more and more. ICP steadily rises from 450-550, up through 1100 or so, then she stalls. I purge the fuel lines, lots of air comes out, close and repressurize, and it happens over again.
Any ideas? I'm about at my wit's end here.
2002 F-250 black super cab 7.3 L PSD auto trans. 4X4 Lariat with a little lift and mud tires.
Veggie oil system removed while I rebuild and redesign it.
Last edited by jordanmills; 02-10-2012 at 06:50 PM.