Well I just can't figure this one out. Sounds like a common problem I have. So where I launch I have about a 3-5 min no wake zone, after power up everything is fine. Motor runs strong. But after a run or 2 bulb loses prime if it ever had it. Engine loses rpm but does not stop running. If I retard throttle and power back up sometimes that helps. But if I leave throttle where it is it will pick rpm back up, most of the time only to lose rpm and start sequence over. If I prime again issue clears for a period and the starts over.
So I had a Merc bulb I replaced it with a new Merc bulb (arrow towards motor), no help. Replaced all fuel lines to motor, no help. Today I changed the anti-siphon valve out but it was just a fitting with no ball. While that was out I put some shop air to it in case my pickup was plugged. None of this helped.
Today when I squeezed the bulb it never got hard, and I could hear air or fuel going back into the tank when bulb is released. I feel fuel passing through bulb but seem like it just goes back into tank when released. No idea where to go next, could there be some loose in the tank?
I also pulled out fuel filter, no debris. Removed low pressure fuel pump, looks good an junk in it.