RE: Alternative to a bladder tank?
Well guys.......I tried it. Put the engine on a stand first after setting up a uniflow tank and ran it with and without the check valve in the muffler. When you back off the fuel does come up into the muffler and out the exhaust. Installed the check valve and ran it again and no more fuel in the exhaust. All I had to do was re-adjust the HS needle for the constant pressure. When I backed off the engine it did run a little rich but cleaned up pretty quick and I could bring it back to an idle as well. I never had to re-adjust the idle at all. I put the engine back in the plane, with a uniflow set up and the check valve and flew it several times today at two clicks off peak and it ran like a champ all day. What has to be remembered here is that this engine never has to come off of WOT from the time it leaves the ground unlike other types of flying. That makes this set up pretty nice.