Join Date: Jan 2006
Location: Northern California
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It just sounds electronic to me... I'm no fan of Glowshift gauges but nonetheless I'm going to guess that its not lying to you whereby you're not reading much much lower fuel pressures than you think simply because I'm going to guess the Raptor is fine and running correctly and through all the normal cycle procedures too.
So that said, I know you've changed the APPS but it still sounds like a flat spot in the rheostat, or a connection to/from the APPS. The only way to know is to hook a scope to it or test the voltage swing of the APPS.
The only other electronic device I say could be causing a problem is the alternator. If the alternator is weak and/or the diodes are bad then the AC voltage noise can get very high and create electronic interference with other sensitive electronic devices on the engine. And these engines are very sensitive to such electronic anomalies too. Test for AC is very easy too if you have a volt tester with both DC and AC readings.
'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's