I don't know where, but remember reading the tubing shipped with some of these is junk - because it did not hold up to the exhaust heat. Mine melted down a couple times as well (the first was before it even got off the ground!), so I spliced a section of silicone glow fuel line about 3" long to the pressure line, and plugged that onto the muffler. That was the end of that problem for me.