I'd first try cleaning the tank in place.
If that doesn't work, consider pulling the engine into the cabin. It's not that difficult and can be done by one person with the boat in the water. It maybe the only way to get the tank out (pretty easy after the A4 is moved) and it will give you the opportunity to clean an examine places that you otherwise couldn't. If you decide to go this route, let me know and I'll give you the steps I took to do it.
If that doesn't work, consider pulling the engine into the cabin. It's not that difficult and can be done by one person with the boat in the water. It maybe the only way to get the tank out (pretty easy after the A4 is moved) and it will give you the opportunity to clean an examine places that you otherwise couldn't. If you decide to go this route, let me know and I'll give you the steps I took to do it.
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