I've scoured this forum and others (for example, this "classic" thread, Looking for info on converting a 01 f-350 psd - Page 22 - Forums
, no i didn't read all 22 pages, ok maybe I did) about converting the 7.3L engine for a 2000 Excursion, yet to be purchased. I've realized that there are lots of different ways to make it work. I like the idea of a regulated return system, but also like the idea of the quick purge times offered by the deadheaded system. I have a thought for a way to combine the two, maybe some of you have a system similar to this, or maybe there is just a great reason not to do it that I don't know about. (the system I'm describing might be very similar to this thread Dead head v.s. return
The D2 would run stock, deadheaded, with no return line. The WVO supply would run to the "test ports" which, as I understand it, are on the opposite side of the heads as the D2. Rather than installing a check valve directly into the head at the D2 supply, I would install a T, with one leg being the check valve for the D2, the other being the WVO return line. The return line would loop back to the pre-pump line. The WVO return would have a solenoid that was open during WVO, closed during D2. The purge would be identical to a deadheaded system. During purge, the WVO return solenoid would close, a "purge solenoid" would open for a set time, flushing the heads of WVO and pushing it backwards through the supply line for a set distance - and eventually back to the tank. Obviously, the D2 pump would need to be switched off during WVO. Does this seem like a good set up?
On a couple of unrelated questions:
1. what do you think of an AirDogII pump with an adjustable regulator. An Airdog rep says the max adjustment is 65 psi. Will this provide enough pressure at the head, considering there will be pressure loss from going through filter, fuel lines, and FPHE?
2. I plan on using HIH for my supply lines, until I get pretty close to the heads and a coolant-heated tank. The AirDog would not have a heater filter. Should I have something extra, like a VegTherm or a second FPHE, to warm up my oil before it hits the filter? I imagine lukewarm oil going through a filter could kill the fuel pressure. I should say that I'm in WA state, temps can get pretty low here.
3. The only Excursion-compatible exterior tank I have found it made by BioFuels Technologies. It looks great, but $1.5k is a lot for a tank, has anybody found any other options for the Excursion out there?
I will try to post a schematic of the system tomorrow. Any feedback would be greatly appreciated.