I have had my boat out 3 times this year 1st time out ran perfect 2nd time ran fine until i shut it off and tried to restart, but after finally getting it started it ran fine.third time out started hard but ran fine once going, shut boat off did some drifting restarted and went about a hundred yards before it stalled out,barely got it started without killing the battery however after i got it going it ran fine. when pumping primer bulb it wouldnt stay firm, however after the boat was out of the water the bulb is now staying firm.someone please help me from the mind games this motor seems to be playing with me.the vent is not blocked and I dont think it would run fine with a bad fuel pump,any suggestions would greatly be appreciated(maybe a pinhole leak in a hose or the ball??????)