Check the pilot burner closely, it's like a mini blowtorch aimed at the thermocouple. I've seen several instances where insect nests/debris have restricted air to the tiny burner causing a shorter flame that doesn't apply enough heat to the thermocouple.
On the other hand, if it goes out after the main burner is lit there could be an issue with restricted gas supply possibly caused by a pinched line or a failing regulator.
Would be helpful to monitor gas pressure (with a manometer) at the unit's gas valve before and after the main burner lights.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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