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the pre-pump fphe was only a thought to boost temps earlier in the line, i would run it with the 40 plate FPHE located in the engine compartment. Is it not advised to run heated oil through your pump? I know it needs to be warm enough to flow, never thought it being too hot would be a problem.
the only differences between your setup and mine is I am running hose-over-hose to avoid any cross contamination of fluids (i've seen these aluminum lines crack plenty of times to be wary). And my fuel filter is before the FPHE.
I did some more IR gun readings on my most recent 40 mile trip, both are with consistent coolant temps of 180+:
at 70 degrees ambient temp (after a long stint of running hot vo):
fittings at head: 200
fuel line to head: 170
VO temp on dash: 170
fuel filter: 140
at 35 degrees ambient temp (no VO used):
fittings at head: 140
fuel line to head: 140
VO temp on dash: 140
fuel filter: 100
I feel like ambient temp is the only thing effecting my setup. and it still doesnt make sense that the VO that is just sitting in my FPHE doesnt eventually heat up to temp as it is not flowing. Perhaps its a coolant flow issue, I may be getting high enough temps at the front of the FPHE but not throughout the system, although I have done readings off the coolant lines near the tank in the past and they were 160-170. Since the filter and FPHE are right next to the turbo in warmer temps it may be aiding in heating up my VO, whereas in colder temps it is not putting out as much heat.
Project Truck: 1990 F350 4x4 Dually Flatbed, 7.3 IDI w/ ATS turbo, ZF-5 Manual, Extended Wheel Base
97 OBS F250 Ext Cab Long Bed 4x4 ZF Swapped, VO conversion, TS 6 Position Chip, E Fuel, 6637 Filter, EBPV delete + PCV Reroute, Diamond Eyes 3" Downpipe