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Join Date: Dec 2009
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How and where are you measuring oil pressure? Like redneckjake said, the pump is one possibility. Others would be the bypass spring, excessive bearing clearances, or a bad pickup.
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM