Did we come up with a solution, change the tank, add foam(which will be difficult, add clunk. My evo .46 power trainer(new) ran for 5 min then at 1/4 throttle started fading. Raised it to half throttle and the motor died quickly. Sound like the bubbles I'm seeing are the culprit?
Guess I'll start with removing the tank and inspect the interior line. Does the cork just pull out when unscrewed. Sorry, total newb here.