hi. i have been having problems with my mercury 200 20hp outboard. if doesnt want to stay running. i first changed the fuel pump and it needed to be done but it didnt eliminate my problem. i then noticed the original float in the carb was cracked and hanging up on the side of the fuel bowl so i replaced that. now the motor rus good but stalls after about a minute of running. i can watch the fuel in the fuel filter (inline filter that i installed) run down as the engine runs.
i will add that when i prime the engine, the bulb gets firm and the filter fills up, but then it looks as if the fuel drains back into the tank shortly after. the bulb only remains firm for about 30 seconds before there is no fuel left in it. is this normal and if not, would it cause my symptoms?