Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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There is really nothing directly under the fuel bowl. The HPOP is on the back of the HPOP reservoir (in front of the fuel bowl) and the fuel pump is in the valley behind the fuel bowl (probably what you are thinking of). The leak in the fuel restriction sensor can cause problems with the wiring down there (especially the Injection Pressure Regulator, or IPR, wiring ... IPR is on the back of the HPOP, 2-wire connector). You can remove the fuel restriction sensor and plug the port with a 1/8 NPT plug, but just don't overtighten it and crack the housing. If your 95 has the fuel restriction sensor on the backside of the fuel bowl down towards the bottom (94 and 95's were this way), you will have to remove the fuel bowl to do it. The FRS just lets you know if there is a plugged filter (doesn't have anything to do with monitored engine parameters).
In a sort-of nutshell, the way the Hydraulically-actuated Electronically-controlled Unit Injectors (HEUI, what we have) works is the low pressure lube oil pump supplies the High Pressure Oil System with oil. The HPOP raises the pressure of that oil to around 3000 psi (it varies on engine needs) and supplies it to the injectors. When the Powertrain Control Module (PCM) electronically commands the injector to fire, the hydraulic oil pressure is used to inject the fuel at 7 times the HP oil pressure. If the lube oil pump is having issues and can't supply enough oil to run the injectors, the truck will run badly or not at all.
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.