Fuel tanks siphoning mystery
I need some input here. I have had this problem with fuel siphoning from the tanks on one side of the boat to the other side.I have a fuel manifold with shutoff valves on all the lines except the fuel return lines for the main engines and the two generators.
This week the fuel from the starboard forward tank moved back to the port aft tank. The only valve open at the manifold was the port aft tank ( to supply fuel for the heater),and the engine return lines. Both the "fuel out" and "return to" lines for that starboard tank were closed at the manifold, so I would think no fuel should have been able to get out of that tank and into the manifold.
I'm thinking maybe I should put shutoff valves on those engine and generator return lines?
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