I ran some seafoam through an old diesel tractor recently that was gummed up and the person didn't want to spend any money on it. When I started working on it, it would stumble really bad at idle and had reduced power with a haze of smoke most of the time. It needed the injectors removed and cleaned as well as probably the injection pump cleaned and resealed. I removed both fuel filters and the strainer from the inlet on the injection pump and filled the new filters with seafoam and put everything back together, I cleaned the strainer and replaced it. The tractor cranked up rough and was smoking and coughing pretty strong so I had to run the RPMs up to 1500 to smooth it out, after a few minutes the tractor was up to temp, I took it down the road and climbed a big hill in road gear and the tractor ran better then ever, when I got it back to the persons house it was smooth and had a good clean idle with no haze. The longer the tractor ran the better it seemed to get, I talked to the person a week or so ago and they said it runs like a new tractor and they couldn't be happier. Sometimes a good cheap option works out great, it would have cost them much more to have the injectors and pump cleaned or worse yet rebuilt. I was really please with it as well, I have never seen such a drastic turn around from anything like this before, I used seafoam before in gas engines and never had this big of a turn around but it really worked well in this old tractor.
