When I bought my boat and brought it up from Florida, about 3/4's the way I notice we had a list to starboad. I went below to check and found the starboard tank was full and the port was at a 1/4. Turns out the crossover valves were open and all the fuel was being pulled from port and the returns were going to starboard. I adjusted the valves and stopped and got fuel to balance the tank. We caught it just in time, any longer and we would of been dumping out the overflow.
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