running blend through fphe

brandonwvo said:

having problems getting my aux pump to pick up the wvo. wanting to blend 50/50 to try to get it thinner and to be able to at least save some fuel money. wandering if there will be any issue running the blend through the heat exchanger? also wandering if i use the blend if i have to purge or can i just run this as my fuel. by the way, its a 92 f250 7.3l idi that i have done a diy conversion on.any ideas would be great. just cant seem to get my oil to make it to my duel filters. any help appreciated:read:

Click to expand...

If you are going to heat your fuel in a one-tank conversion, then a 50/50 blend with diesel fuel should work fine. Blends that include light solvents, such as gasoline, should not be heated or the solvent will be evaporated off, and may cause vapor lock. Also, do you blending outside of the fuel tank, and let the blend settle for 24 hours, then drain off the sludge at the bottom of the tank, then filter it to 1-5 microns

brandonwvo said:

i have a two tank system with serperate filters for each. i want to run 50/50 wvo-diesel mix... im wandering if i still should start on diesel or try to start on the mix.

Click to expand...

Since a two-tank system requires starting up and shutting down on diesel fuel, and it tends to take about 20 minutes for a diesel engine to come up to temperature, then two-tank systems are best for long-haul applications, and are often impractical for city driving. This has brought a number of people to using blends for around town. I have a two-tank system, and use blends for around town. You could just put your blend in your start-up tank, and drive around town on it, and never switch over, and leave your waste oil tank for long haul use only. And, if the fuel in your start-up tank does not pass through your heat exchanger, then you could run a gasoline blend, which will require less gasoline than diesel fuel, and will start right up in the winter without the need of a block heater.

brandonwvo said:

my wvo tank is the rear and is half full of wvo that has never been used, its a brand new tank. can i add half tank of diesel, start on it and drive it. that tank does go through the heat exchanger. thats what i need to know. for the summer, can i start and run on 50/50 wvo/diesel blend with no issues of the temp of the fuel or messing up my IP?
any help would be great, im new trying to save some fuel money
859-519-7720

Click to expand...

Theoretically you can top off your waste oil tank with diesel fuel and not worry about your blend passing through a heat exchanger. You could also add kerosene at 3/4 of the diesel amount and have no problems with the heated fuel system.

However, there are components in waste oil, especially WVO, that can precipitate out of solution when a petroleum distillate is blended with it. So, if one is going to blend, then it is best to do the initial blending outside of the fuel tank, then allow a period of settling (3hrs to 3 days) then drain off any precipitates, then filter. So, it would be wise to drain the WVO tank and do your blending in a separate tank, then re-filter after settling.

brandonwvo said:

what about starting on it? thats what im wandering. if i blend outside the tank, let it sit, then filter and refill. can i start the truck with blend and drive without having to start on straigh diesel? im going to keep my front tank straight deisel so that if i have problems with the blend i can purge it out and go back to diesel.

Click to expand...

I have been running various blends of Waste Vegetable Oil (WVO) and unleaded gasoline (Petrol) since Feb, 2007 on a 1983 Chevy 6.2L diesel with a Stanadyne Rotary DB2 IP. I have started the engine with no difficulty on an 80/20 (WVO/gas (petrol)) blend down to 3F (-16c) without the use of a block heater.