i have got a os40la in a modeltech magic and the motor runs great the problem is when the airplane is tilted it dies no matter what i do also i mounted the engine straight up instead of sideways i the problem is the airplane runs out of fuel when tilted
could this be a fuel tank problem the top of the tank is a little below the center of the carb please help

Could be. The CENTRE of the tank should be just below the centre of the needle valve. Also how big is your tank?

its an 8 oz tank it came with the plane . so does the center of the tank or the top of the tank need to be level with the carb?

thanks it was the clunk in the tank the tubing was to long and got caught in the front of the tank