Fellow tech advise needed 02E250 P1211

[ajpu1983]

Hey everybody, wanted to pick ya'lls brains on a 2002 E250 I'm workin on. Showing a P1211. Reringed all the injectors. Fuel pressure at 70 psi under load at fuel pump outlet. Replaced ICP sensor and IPR valve with known-good units. Truck will build ICP fine at idle but when put under a load the IPR duty cycle hits 65% in about 50 yards and it throws a p1211 and wont build above 800 psi. Changed oil. Stumped now. Possible HPOP?? Most HPOP failures I ran into were complete failures (no-start). Is it a possibility that the bolt and washer are not torqued correctly allowing the pump to not grab the gear or has anyone ran into a HPOP that was just worn out and would not put out? Possible cracked oil pickup tube? Any ideas would be greatly appreciated. AJ

[Dirk]

If the duty cycle hits that high... and ICP is that low, I would replace the IPR. They GENERALLY fail first.

But you already did that. Replace the HPOP or put a pressure gauge on the HPOP res. Either it's not getting oil or there is a blowby condition in the HPOP and the pump is not pressurizing.

If the pump hasn't been replaced before.. I doubt the gear is spinning around the pump. The bolts rarely back out from the factory. And if it is, you'd hear a strange howl if you put a stethoscope to the cover.

[RoushTransportServices]

I agree It sounds like the HPOP to me, But that high of a duty cycle, you cant rule out the injectors being bad. Very seldom have i ran into a HPOP just completely dieing, most will get so weak that the truck runs like crap when trying to get any HP out of it first, and that usually when i get it