This has me baffled and I hope someone can help. I have a Pheonix Super Decathlon 40 with a ST 75 on it angled at 7 o'clock looking from the front. I test ran the engine on the bench 3 times and it ran perfect. I bought the airframe from a guy who had already assemled it and after I put the engine on I tried to fuel it. That didn't go so well as I got maybe three turns on the pump and fuel began to pour out of the carb and exhuast vent so I disassemled it to find that he had the vent line touching the bottom of the tank. Anyway, I re-plumbed the tank to match every tank I have done in the past ( I've put together at least 20 planes) and fuel still comes out of the carb as soon as I get a prime on the pump. I did take it all apart the other evening and the carb is located along the centerline of the tank. I'm lost on this one so if anyone has ideas I would really appreciate them!!

Scotty