Winter storage gas level?

[WiskyDan]

So I’ve seen many people say fill up the tank to almost full and others say that Yamaha dealers store boats all winter without gas (or very little) in them.

The gas gauge was at about 15% after our last outing and I’m trying to decide should I leave it as-is or fill it up. I haven’t really paid attention to the gas level much in the past (dealer winterizes the boat and stabilizes the remaining gas) and haven’t had any problems. I store the boat in a heated warehouse over winter if that makes any difference.

 

[Neutron]

So I’ve seen many people say fill up the tank to almost full and others say that Yamaha dealers store boats all winter without gas (or very little) in them.

The gas gauge was at about 15% after our last outing and I’m trying to decide should I leave it as-is or fill it up. I haven’t really paid attention to the gas level much in the past (dealer winterizes the boat and stabilizes the remaining gas) and haven’t had any problems. I store the boat in a heated warehouse over winter if that makes any difference.

You will get more moisture in the tank when its not full. I would fill it. That is the rule of thumb on any tank that is in storage.
Steel tanks rot out badly from the excessive moisture. Your tank wont rot but the water it produces can affect your fuel system. Rust injectors etc...

 

[Babin Farms]

So I’ve seen many people say fill up the tank to almost full and others say that Yamaha dealers store boats all winter without gas (or very little) in them.

The gas gauge was at about 15% after our last outing and I’m trying to decide should I leave it as-is or fill it up. I haven’t really paid attention to the gas level much in the past (dealer winterizes the boat and stabilizes the remaining gas) and haven’t had any problems. I store the boat in a heated warehouse over winter if that makes any difference.

I’ve store mine with and without fuel up north with no issues. I would use Seafoam or something to stabilize the fuel and also dump a couple cans of HEET in the tank at the beginning of the season.