I'm running a murnan plus 12 and noticed something funny yesterday. I have a brand new fuel tank and the motor hasn't seen a full race yet but I did the swauger break-in and have run maybe a gallon through it with break-in and practice.

What I noticed was when the engine got up to temp. (about 250F), I was seeing bubbles coming up through the fuel line off the tank. There is still a lot of fuel in there and it's a new tank and new line so i'm guessing no leaks. The engine didn't like the bubbles at all. Would not keep a steady idle (of course) every time a bubble went into the carb. So, I purchased one of those funky Orion pressure devices because the local hobby shop was out of Mugen pressure chambers. My question is, do you think this will fix the problem? Orion claims that it will but I was wondering if anyone else has had this issue and if this fixed it for you? Thanks for the help.