Compression Ignition Addict
Join Date: Dec 2009
Location: Montgomery, TX
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I agree that it sounds like a fuel knock from your description.
The 7.3 does not measure fuel pressure anywhere. It has a circular fuel system, with fuel being pumped from the tank, through the filter assembly, out past the pressure regulator, and back to the tank.
I would make sure your filter is clean, and then if that isn't the problem, I would put a pressure gauge on it (there are two ports on the fuel filter assembly you can tap into) and make sure it is running between 55-70 psi. If not, things to check are the fuel pickup assembly in the tank (including the two screens inside the mixer assembly) as well as your lift pump. The regulator is nothing more than a spring loaded valve, so there isn't much to go wrong - but occasionally they stick open. Shouldn't be too hard to track down.
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