I ran a HIH from the head, back to my WVO tank. Ran the line through the Heater in my WVO tank then returned it to the heater hook up.

Water flows straight from the head, to my HIH, through my tank heater then back to the firewall and into the input port for the Heater Core.

This works well for me in the winter. When the vehicle reaches operating temp and I get strong heat I switch from diesel to my WVO.

I am running a steel brake line as my fuel line though. Does anyone have concerns or see problems with this? I originally had a 1/4" copper line but it turned green after a few thousand miles.

I also run injector line heaters.

When I first began running WVO I had very little heat and ran a one tank system. After a 300 mile trip for business, and parking the car outside with no way to plug in my little girl, I got about 20 miles home when the whole thing "gunked" up. It took me a long time to run all of that gummed up WVO out of my lines and system.

Since I've been heating, no problems at all!

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1982 240
460,000 miles total
140,000 on Rebuild