I have a fuel problem

[FishStretcher]

I had this same phenomenon. But I could see the squeeze bulb getting sucked flat. If yours isn't, then it is after the squeeze bulb. (Probably the outboard) Mine was a tank that had a straight cut tank pickup just off the bottom of the tank. It wasn't slash cut. It would suck itself flat to the bottom of the tank at full throttle.

My 4 stroke yamaha has inline filters, one per carb float bowl. They are tiny and plug easily- they are the diameter of a 6mm/ 1/4" hose in the float bowl, pinned against the engine block. Those will plug if the rest of the system isn't clean. but a 2 stroke might not have this "feature".