can anyone tell me the experiance they have had with straight wvo and the bosch vp44. I have done a lot of resurch and am a diesel tech. I can see no problems with a good 2 tank system and a low fuel presure warning sysem.

anyone besides patracy have any experience with vp44 and UVO?

I have run 50/50 40/60 30/70% mixtures dino-diesel/WVO in my 2002 Dodge Cummins with the VP-44 IP. I do not have a two tank system, I just dumped into the original fuel tank. I started last spring when fuel prices became prohibitive. I have not experienced any catastrophic failures. Here are a few points/observations:

1) I have a fuel pressure sensor and light installed to warn me of low pressures.
I had no issues with fuel pressures during the summer.

2) The Cummins engine sounds "muffled" with this fuel mixture, it does not crackle as strong as with straight regular diesel. This suggests retarded timing to me, which is corroborated by smoke from the tail pipe when the engine is cold; not black, but grey, suggesting fuel isn't burning very well. It smokes black under load and with a warm engine. I would expect injector-coking and ring-varnishing after a while.

3) No loss in power - towing a 27ft fifth wheel RV up and down Alberta's alpine landscape.

4) Problems arose in the fall when a cold night thickened the fuel mix considerably. One morning I had a hard start, resulting in a Malfunction Indicator Light (MIL) and codes P0251, P0252, P1693 (companion code). The first two codes are something about internal fuel metering. I had only 1/4 tank of mix, so I went and filled up with straight diesel to dilute the mix and cleared the codes - MIL off and no more problems. Since then I no longer use mix, just regular diesel (low fuel prices do not warrant the risk of frying the VP-44).

5) I agree my one-tank test is not ideal, but what are the options? There aren't any (see point 6).

6) My thoughts about a real two-tank conversion: There is an electronic module mounted on the VP-44. I bet you that thing hates heat like the devil hates Canadian winters. I would be careful feeding heated vegetable oil into the VP-44, which is supposed to function as a heat dissipator for that electronic module. Unlike the Chevy 6.5's PMD/FSD, this module cannot be easily removed/relocated from the VP-44.

7) I think the VP-44 is not suitable for SVO/WVO fuels. Get used to it. Until I see a number of VP-44 trucks running successfully on this fuel for a long time trouble-free I rest my case. Do a search on the web - not many hits popping up. Guess why! It's not because this engine/vehicle combination isn't popular! I will not invest into a two-tank system at this point, because I am not convinced it is of benefit in the long run. I will fuel this truck with what the fuel system was designed for: dino-diesel.

Comments, suggestions always welcome.

1998 Chevy 2500 6.5TD
2002 Dodge Ram 2500 5.9 Cummins