TheDanceII wrote:
Fuel transfer is achieved by gravity and level of the boat. If the boat is listing to the port side, more fuel will begin to transfer to the port tank since gravity will pull it in.
Recommend always keeping the transfer line closed for these reasons.
1. If fuel becomes contaminated in one tank, you can still motor home on the other.
2. List, wave action, and/or turning of the boat will cause fuel to transfer to the lower side of the boat making one tank heavier and causing a continuous transfer based on the list of the boat.
Only transfer fuel when needed and then shut the valve back off.
It's really a crossover valve, allowing the engines to draw fuel from either tank, not taking a transfer valve.