re: Boat fuel tank problem??

It sounds like you have a fuel hose leak somewhere between your bulb and the tank. With a full tank, you have some pressure head advantage to keep the motor running and then you're eventually drawing in too much air.

I'm not sure what the build quality on the Key West is, or your Suzuki installer, but sometimes boat mechanics use shitty automotive "stainless" hose clamps, or they only use one. 17-4 stainless or 304 is common and cheap, but it won't hold up in a boat. Could also be a defective hose.

If you track it down and repair the hose, use two 316 stainless marine clamps on each hose barb and align them in opposite directions.