SSZ 314DLCR, 7K hours Display indicates "change fuel filter". Event code E0198-02, low fuel pressure. Fuel pressure at startup (hot or cold), 57-62 psi At idle, pressure stabilizes around 45psi At WOT, AEC off, no load, fuel pressure stabilizes around 38psi Speed dial 10 target RPM is 1800 rpm, but when hydraulics are stalled, rpms drop to 1550, and fuel pressure will eventually drop to 12psi. Remove load, and fuel pressure comes back to around 40psi. Starts instantly...even after changing rail valve and not priming No exhaust smoke Normal SOS Changed fuel transfer pump...saw 4 psi increase across the range Changed rail pressure relief, and return relief...saw 4 psi increase across the range. Daylighted fuel tank...spotless Replaced lines to separator and transfer pump...no change Replaced all 3 fuel filters Verified no restrictions in a supply valves, elbows, etc...no banjo screen found to clean Changed hand primer pump...no change Run from fuel can to lift pump...no change Consensus? Injector return rates too high? No E0398-2 event, so rail pressure isn't necessarily suspect, is it? Absolutely no codes, and only E0198-2 events. Help
Correction....speed dial 10 is 1950 rpm.