The muffler that came with the engine has no opportunity to add the pressure fitting at all. I have checked with K & B and they do not sell a muffler for this engine with a pressure fitting already present. I have only one or two options at this point I guess. Fly with the fuel tank vented to the atmosphere or drill and tap the muffler for a pressure fitting. If I can find the fitting and a tap I think that is what I will do although I have some doubt that this will be successfull. My doubts are founded on the belief that the muffler wall is probably too thin to take a tap very well. We'll see. Thanks for your help and if you have any ideas where I can buy the pressure fitting and correct tap please let me know.
Sincerely
Duane