1983 Volvo Penta AQ125A carburetor problem. I rebuild the carb. Filled the float bowl with fresh gas. It starsts right up, idles smoothly, and runs for about the time the float bowl gets emptied (10min). When the bowl is empty the motor shuts off and will not start again. I have to take the top of the carb and manually refill it and it starts right up again. So the problem is the float bowl does not get refilled at the correct level to keep the motor running more than 10-15 min. Please advise what might be the cause. The needle valve looks new and it does go up and down freely.