Originally Posted by shadetreemechan

I am reviving this thread after having to rescue my wife and her 300TD today running 80% wvo 20% RUG.
This is what I have noticed and I would be interesting to hear others opinion.
What I have found is RUG works fine as a blend as long as you do not work the engine hard. I have logged thousands of miles of easy driving on an 80-20 mix. However.....
Today I had to pick her up on the side of the road because after two hours of towing a trailer with progressively worse performance the car quit and refused to even idle any more. Filters were fine. I disconnected the tank and limped to a diesel pump burning straight transmission fluid from the jug under the hood and filled the tank with diesel thereby diluting my 80-20 mix considerably. After several minutes car came back to life and ran fine for the rest of the 150 mile road trip.
I had put several hundred miles on that blend previously with no problems, but also not towing a trailer.
Experience number two is my John Deere 1050. It will run fine on 80-20 unless I am bushogging which uses all the power its got. When bushogging on 80-20 it will run for about 30 minutes and then gradually loose power until it will not run any more. Once cooled down it will run again fine for a while, but if worked hard the same thing will happen.
Experience three is my 240. I have been running 80-20 blends in it without issue all winter. However I took it on a road trip a couple of weeks ago during a warm spell and it was wound out for an extended period running 80 mph in 85 degree temps. Did it fine, but once off the interstate I stopped it for 5 minutes and when I went to start it again it would not start. Filters were fine, but no fuel was getting to injectors. I let it sit and cool down for 30 minutes and was on my way again without problems.
I am suspecting in all three instances ip or lift pump vapor lock. In reading on the internet it seems people also talk about excessive injector coking from a lack of cooling of the diesel as it passes through the injectors.
What I know is I have 8 plus years of blending experience with diesel or kerosine and wvo without issue (outside of filters).
I tried blending with gas once about 6 years ago and again this winter. I am switching back to diesel and kerosine and do not think I will try RUG again.
Anyone else experienced anything similar?