Loosing power under way

[phatdaddy]

if the bulb is between the filter & the motor, i wouldn't think it would be the filter. if you can pump the ball and it will firm up, it seems to be doing its thing. i would look at either fuel pump or tank vent or tank pick up.

i'm guessing this is an outboard, are you runing the oil injection system?
try running out of a seperate fuel source & see if the problem follows.