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Originally Posted by ClassicFordGuy

Wow, thats a cool easy way if doing that. Thanks for the great pics. What is the "looped return" Your talking about? Do I need to heat my trucks return line to my bio tank?

$1 a foot for alum tubing seems pretty reasonable, especialy from mcmaster.

What is the 16 plate FPHE you mention and where do you get it? I understand its a heat exchanger but what for, is it for a filter?

Thanks,

-Rob

If you use an internally-regulated fuel pump - there will be no return to tank on the VO side. If ya use an external, return-type regulator (similar to stock), then I recommend 'looping' that (VO) return line back into the supply line right at the tank. Basically, tee into the line coming out of tank so VO is sucked back to pump instead of returning to VO tank - creating a loop for the VO to travel. These fuel pumps all supply waaaay more fuel than the engine uses and the 'extra' normally gets returned to tank. We just pull the fuel we burn from tank and the 'extra' just circles around the loop, eventually reaching near-coolant temp!

Here's a pic of the FPHE in my trucks: ($125 frybrid.com)


and a 'loose' pic:


This is at the end of the VO lines (just before heads/engine) and the beginning of the VO coolant loop. It gets the hottest coolant and insures VO is near coolant temp before engine and also speeds time to get VO hot. When I had a looong (25ft) looped return - I did not need FPHE, that was added after going to internally-regulated VO pump (FASS HPFP) I have heated fuel pick-ups and TIH before the VO pumps and filters to make sure the oil will flow thru the filters in very cold weather. In fact ALL of my fuel lines are heated - so I can easily burn VO in weather too cold for DIESEL!

The valves here allow me to totally isolate VO system from engine. I close the coolant valve if I am driving for extended time on diesel (God forbid I run out of VO!!) Also visible is temp sender and fuel pressure sender. You can also see the teflon-lined SS hose I used for fuel lines on the engine and notice how I terminated the TIH at the FPHE...

Good Luck!