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If you're losing prime on the bulb, it's not a gas quality issue. Did the dealer water test before giving the boat back to you? If so, and you're running a different tank and hose, that could pinpoint the issue.

First thing to check is for an air leak in the fuel line. If you can prime the bulb hard and don't see any fuel leaking in the lines from the bulb to the engine, including checking the lines under the cowling, the culprit lies before the bulb. Check the connectors at the tank and the engine (they have o-rings that you can visually inspect) as well as all the Oetiker clamp connections along the fuel line. If you can, also inspect the pick up tube that runs down into the tank.

Is it a genuine BRP fuel line and bulb as the aftermarkets are known for poor quality?

There's a possibility it could also be the fuel lift pump, but these engines are run at all speeds and loads at the factory before shipping, so focus on the fuel lines and tank now.

Should also mention that these engines are so efficient at idle, running on the muffs isn't really a test of the issue.