Posted by markct on November 20, 2007 at 18:59:13 from (12.76.155.178):
In Reply to: low-sulfur diesel fuel posted by plowboy 1 on November 20, 2007 at 18:35:46:
i am a mechanic for a medium sized fleet of garbage trucks and tractor trailers, the change to ultra low sulfer diesel a year or so ago did take alot of the lubricity outa the fuel, but the other problem is that it made it alot more prone to gelling, ya almost have to use an anti gel product now whereas before some people snuck by without, we use fppf brand but most any will work, the new fuel doesnt react as well to kerosene cutting as the old stuff did, it used to be that with say 10 percent kero the plug point lowered say 5 degrees just for the sake of talking, then 20 percent would lower it 10, and so on, well the new fuel ya get very little effect beyond 10 percent tests have shown. so additives are the way to go, and most also add lubricity back into the fuel also, and contain a water dispersant, this is especialy important with mixes containing biodiesel, since they say the esthers in bio have a tendancy to attract moisture, which i would have to agree with since before we started running 20 percent bio our fuel tank was shiny like new steel inside, now a look in thru the manhole shows a good bit of surface rust all over the inside, its a 10,000 gallon tank. we had filter plugging problems with bio, but not temperature related as much as quality of bio related, we had filters plugging with a load of fuel, then next few loads were fine, then another series of filter plugging with stuff that looked like vaseline, glycerine and other compounds they said. no amount of treatment would cure it, and it wasnt even cold, maybe mid 40s at coldest. so bio is still kinda a luck game atleast around here. but realy we saw very few problems with the bio except for a few bad loads we got
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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