Hi All

Have a new TT Pro .46 and am very pleased with its performance and ease of tuning. However,
I realized on the second or third flight (it's mounted on a SPAD Debonair) that if I sustain a steep angle of attack, the engine stalls after several seconds and I end up having a deadstick landing. After this happened the first time, I started the plane, held the nose up vertical and observed. After several seconds (five to eight, maybe) I notice that the fuel line fills up with air bubbles and shortly thereafter the engine dies. The fuel tank is a Dubro and I installed the supplied hardware per the instructions. The clunk is all the way at the bottom (and rear) of the tank and this does not change when the plane is vertical. Can anybody give me suggestions about where the air in the line is coming from? The tank sits just aft of the firewall so there isn't a lot of distance between the pickup and the carb. The centerline of the carb sits slightly above the centerline of the fuel tank. The only time the airbubbles appear is when the plane is vertical, otherwise the thing runs great and has good zip for pulling the plane around the sky. Any suggestions, tips, hints, etc. would be appreciated. Thanks in Advance!

Steve