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Originally Posted by lilb93
I have a 1999 ford f-550 7.3 under 1200 rpm the oil light comes on. I changed the low pressure oil pump and front cover and seal . Same problem.. I checked the check valve inside the oil filter housing and that is fine also. The engine runes ruff real ruff. Wondering if anyone has a clue or has a similar problem. Thanks
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sounds to me like you have a bunch of blowby somewhere that the low pressure pump is unable to overcome at low RPM's.......how many miles??? and do you know the full mainanence history??? has there been any evidence of dusting.......Marc