Compression Ignition Addict
Join Date: Dec 2009
Location: Montgomery, TX
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I think I misunderstood your problem. I thought you were draining down while it wasn't running. You are saying that the HPOP reservoir empties while the truck is running, right?
One correction to your thought process - lower injector o-rings will cause oil to leak into the fuel rails, being burned - sometimes causing smoking. Leaking upper injector o-rings will leak upwards, into the under valve cover area, which drains back to the pan.
When you say no scoring on the front cover of the LPOP, you do mean the front cover of the motor, right? The cover for the LPOP doesn't matter. (i.e., you would have to pull the pump and look at the cover behind the pump)
There can only be two explanations - the HPOP is pumping oil out too fast (still leaking injector o-rings) or the LPOP isn't providing oil fast enough (worn pump gears OR leaking oil pickup)
The test for the oil pickup tube is to overfill by about a gallon, and jack the back of the truck up as high as you can.
2003 F-250 XLT CrewCab 7.3, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6, Ford Severe Duty AIS, 31 row 6.0 transmission cooler (not the sissy 26 row)
, ScanGauge II