Bet you can't figure this out! Hair pulling out or dynamite going under truck! - Ford Powerstroke Diesel Forum
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Old 06-26-2013, 07:42 PM
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Bet you can't figure this out! Hair pulling out or dynamite going under truck!

2008 F-350

Filled up in the morning at a station I frequent and headed on down the highway. About 20 miles into the trip I felt some crazy vibrations like the tires came out of balance.

Brought it to the shop and assumed it was injector(s). Had them flowed, all good. Had a melted piston. Piston replaced. Truck starts and will idle all day long. When you drive it the truck will simply cut off. No codes.

Low pressure pump test good. Through diags it was determined that the truck was losing pressure at the rails, to the tune of 190 psi. So, sounds like a high pressure pump right?

Cab comes back off and the high pressure pump is replaced and that stupid thing is $1000.00, something of which I was not happy about doing since it I drove the truck to the shop. Time for another test drive. Drive is a little bit better on the psi but still losing pressure so doing the same thing. Hmmm, maybe there is something clogging the lines to the high pressure pump.

Cab comes back off and the lines are blown out. Test drive again. Drive seems to be fine but when you get on it a little it just shuts itself off and dies.

Does restart after a few tries. Any suggestions?
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Old 07-03-2013, 10:35 AM
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Got one that stumped ya'll? Drives and runs fine, just no go with WOT...
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Old 07-03-2013, 04:21 PM
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it does sound like a fuel issue. the hpfp on the frame rail might need to be looked at. has there been any other issues with the truck? fuel filter? the shop should be able to check the fuel pressure when you hit wot.
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Old 07-03-2013, 04:32 PM
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Could be screen on pickup in fuel tank causing pump and fuel rails to starve for fuel under WOT conditions.
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Old 07-25-2013, 08:21 AM
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Are you getting any air out of the bleeder at the top of the fuel cooler?
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Old 07-25-2013, 10:09 AM
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Damn you only paid $1000 to have the cab off and HPFP replaced? That's actually not a bad deal.
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Old 07-26-2013, 06:07 AM
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You said you just filled up could it be the fuel???
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Old 09-03-2013, 03:59 PM
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I just had to swap out a bad "new" Ford HPFP. It was bad from the factory that it came from. New one fixed the problem. Good luck
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