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I had the Roosa Master pump go out once on a 4010. It didn"t do what yours is doing. It just got to where I couldn"t control it; would run at whatever rpm it wanted. Puffs of smoke, if black, to me sounds of carbon buildup and carbon around the tips of the injectors occurs BTDT. Additionally, the injector nozzles could be clogging either internally from the fuel, or externally from this carbon buildup. Once you screw up the fine mist spray pattern, you loose BTU"s, hence hp., and you get the black (unburned diesel) smoke. I"d get something like "Sea Foam", obtainable in pt. cans at most any auto parts store for around $6 a can. It has oil, naptha, and alcohol in the mix and was initially designed to loosen up rings and clean up combustion chambers on outboard motors (for boats) in the colder climates where people liked to troll at low rpm"s and engines were getting all choked up. I have tried regular diesel treatment and used Marvel Mystery Oil (also a solvent) for years, but even after doing that, when I did the Sea Foam thing things changed. I use it in everything with an internal combuston engine around the place, everything, and have given all my tractors a "dose of castor oil". The results have been phenomenol. In most of my 40 year old tractors, it has completely cleaned up the exhaust. I recovered lawn mowers, weed eaters, chain saws and outboard motors. If I were addressing a problem such as yours, I"d put about 3 cans in a tank of diesel (about $20 worth) and just give it time to do it"s thing. Go about your business normally for the most part. However, it works best if you get it in the engine, give the engine a work out and then let it sit and back and forth. Allowing the engine to sit between operations (like overnight), gives it time to soak into the carbon and loosen it. About every 10 minutes (give or take) of operation, set the throttle to governor limit rpm"s and let her roar. Don"t be surprised what comes out of the stack. I buy it by the case of 12 and usually ask for and get a 10% discount. Besides, this is good for your engine, whether or not it solves your problem, it"s easy to administer, and is cheap. Can"t beat a deal like that, and who knows it may work. HTH Mark
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