My 6A with an o320 -150hp , carb does not like mogas and I am having a hard time understanding whats really going on. Seems that when the OAT gets anywhere close to 80 and after a long taxi, when I apply takeoff power, the carb floods after a few seconds, creating a huge cloud of black smoke out the exhaust and then the engine completely quits. This happens almost all the time if I have the boost pump on, but not as often with the boost pump off. My fuel pressure never exceeds 4.5 PSI with the boost pump on and with it off, its .5 psi, when this happens. If I run straight avgas, I never have a problem. I installed the 150HP for the sole purpose to run mogas so this is a little frustrating and I would like to find a way to make this work, if possible. The mogas I use works perfect in my other planes but they are not RV. This is a new engine with new fuel pump, carb and everything else related to the fuel system. I always thought vapor lock was lack of fuel, not too much fuel.What am I missing here?