Could be - restricted fuel module\supply pipes, leaky pipes, hoses - same vehicle(s) with multiple failures, multiple vehicles same failure, etc - either\both could also indicate defective module - need more input, hopefully B4 everyone commits to Racor or Fleetguard

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go