Wish I could drive my truck!

[MCFR22]

My truck has been in the shop for three weeks now! I took my "05" F250 in because it was stalling out at low rpms. After checking it we found that the oil pressure is dropping off at about 1000 rpms. We put air to the rails and they hold fine. Replaced the tubes, stc fitting, and IPR with no improvment. The question is, How can I make sure that the HPOP is the problem before I sink the money into fixing it?

[dannyboy950]

Before you change pumps have them put a mechanical gauge on the oilfilter houseing and see if your not loosing oil pressure there. I am assumeing that Ford ran the air test properly and did not find any leak.

Your low pressure pump may not be supplying enough oil to keep the HPOP oil resivoir full.

[MCFR22]

Yesterday when I was there they were getting ready to take out the oil temp. sensor and check the pressure from there. I havent heard back from them with the results yet. I have been told that it could be blowby from a bad injector. Is this possible?