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Message: <blockquote data-quote="bobbie-g" data-source="post: 1417" data-attributes="member: 26"><p>Thanks, StuZ and Tazza. It still seems this problem started just when the fuel pump was replaced, but perhaps it is not actually related. The dealer told me today it was probably just running a bit rich at the higher altitude (8000 ft now vs the 5000 ft where the work was done), but that seems like it would produce black sooty smoke. His advice was to just use the block heater so it would not get too cold. We shall see how this turns out. I do have what are probably leaky valve seals on my gasoline pickup (140K miles) and I get blue smoke for about 2 to 3 seconds on startup. The Bobcat puts out blue smoke for 2 or 3 minutes when cold, seems a bit too long for leaky valve seals. Another Bobcat person said it was perhaps worn pistons/rings, and after a few minutes the pistons warmed up, expanded, and helped seal to the cylinders better. Seems plausible. As long as it starts OK and runs well, I'm not inclined to do much to it. Tnx again for the advice and info. ---Bob</p></blockquote><p></p>