I had an issue and was conversing with Doc Mark. He gave me some great suggestions, but also recommended that I post my question to a wider audience, so here goes. I got an excellent deal on a 1974 Coleman 413G which I was going to part out on another 413 and other stoves. Of course, I had to try it after a little minor cleaning (blew out manifold and aux. feed tube and flushed tank out) and testing (oiled leather, verified check valve held and filler cap gasket was good). When I attached the tank, I did notice that the generator entered the manifold at somewhat of an angle. It lit right up and burned brightly with no fuss at all, but I could hear random very soft pops from time to time. I assumed there was a small amount of fuel in the manifold that was igniting, so I shut it down to empty it out. Nothing came out. I re-lit it and ran it for approximately 20 min with no change. There were soft pops the whole time. The flames were blue and steady the entire time with no flare up or sign of excessive fuel. I don’t recall hearing this popping with my other Colemans. Thoughts?