My buddy has this motor on his boat and is having a bit of a issue trying to track down where the air is coming into the line. I say coming into the line because there is zero fuel smell in the bilge.

He pumps up the bulb to pressure and everything runs fine..but as the day wears on the bulb loses pressure. He has checked all lines...every connection that he can lay his hands on to make sure every thing is tight and not leaking.

Just asking incase someone might have that magic answer.