under a load

[The Bus]

03 7.3 no chip just 4" ex. when pulling hill in 3rd gear (auto) 2000-2500rpm with 10,000lb. trailer starts loosing power and cel comes on. p1211 code. pull same hill, same trailer in 2nd gear 2500rpm, 40-45mph light does not come on and plenty of power. actually have to back out of it. if it's a pressure issue whats the diff. between 2nd & 3rd

[dhanna6powerstroke]

Originally Posted by The Bus

03 7.3 no chip just 4" ex. when pulling hill in 3rd gear (auto) 2000-2500rpm with 10,000lb. trailer starts loosing power and cel comes on. p1211 code. pull same hill, same trailer in 2nd gear 2500rpm, 40-45mph light does not come on and plenty of power. actually have to back out of it. if it's a pressure issue whats the diff. between 2nd & 3rd

Check this out and see if it helps. Just did a quick look.
PowerStroke Diagnosis

[The Bus]

no help but saved it anyway

thanks

[Dave]

Higher RPM means less fuel needed to maintain it.

What you are seeing that code for is your Chip is calling for more fuel than your HPOP can provide.

Upgrade your HPOP

[The Bus]

no chip, 2nd reman hpop from ford. reman engine from ford still under warr.

[votran john]

See that the filter for the hpop is clear. Its in the bottom section of resvoir. Load created a greater volume demand.

[howardtm]

here's what my problem was in a somewhat sim problem, only mine was more extreme..have an inlet restriction test done..very possible you have debris in the fuel tank..higher fuel demand sucks up the debries and clogs the fuel pickup screen. shut her down and the demand stops..thus the debris drifts back to the bottom of the tank...until the next high demand, especially on an uphill grade.

[The Bus]

is the filter for the hpop part of the pump or part of the housing? on it's 3rd pump but if filter is part of housing does'nt mean ford checked it when replaced pump.

have heard about fuel pickup being clogged before, have a pre-pump set-up from sinister on order now.

thanks guys, will keep everyone updated

[The Bus]

filter screen in tank and mixing valve clean, no debris, did tank mod and sinister pre-pump filter while in there. truck goes to independant shop next week to have hi-pressure oil system checked for internal leaks (injectors, oil rails, ect.)