I just rebuilt the carbs on my 87 40hp, started it up and it ran great for about 5 mins then died and would not start again till I pumped the bulb. Now it will only run after the bulb is pumped and will run till the carb empty's out. Pump it again and it runs till the carb bowl is empty. I am guessing it is the vro pump, how do I know thats the case.