HIH will heat up probably 10X faster than HOH.

It gets much hotter than 100'F but will start to cool a little as it leaves the HIH and slows down thru the big spin on filter.

I figure normal WVO temps to be about 160-180'F when exiting the HIH. I figure it will be a little less than the dash temp guage. If temp get too hot, I can switch off the electric boost pump and all the fuel will flow thru the unheated line.

I am now running a parallel unheated line so I can switch back and forth, depending on if I have diesel or WVO/blend in the fuel tank.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5