Hey need help with a stubborn 6.0L. It has new 90hp injectors, egr delete, new ipr valve, one piece STC, stand tubes, snubber valves, and dumby plug. I had it running poorly for 3 days and forgot to tighten the return line on the upper fuel filter housing. So I drove 40 miles home and turned it off and now it will not start again. I have pressre tested the HPO system and can only hear air bubbles from the pick up in the oil pan with the ipr closed. I have a HPOP coming Monday but was just looking for conformation that this bubbling is the sign of the weak HPOP. Thanks

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Any info would be greatly appreciated, I have read every forum and can not find any info on this issue. Please reply