My '97 Mariner 25 HP starts and runs fine. Then the fuel level in the filter bowl starts changing pretty quickly. It will drop half way then fill back up, repeating this over and over 'til it finally drops too far and the motor runs out of gas and shuts down. I pump the bulb to re-fill the bowl and it starts right back up and does the same thing again.
If I rev the engine, it just does it quicker.

Help!

Thanks, Freddy Tebeau