The two outside hoses are from the tanks, the center should go to an engine. Depending on if they are hooked up right you should be able to run both engines off each tank or both off one tank. I've found that some of the shutoff valves don't really do anything. If you take the hoses off and watch the valve turn if should indicte what position you want to have it in. Some of the indicator plates have been know to be wrong, mismarked or just plain duplicates of each other ie: two starboard or two port.

I have found to find where you are happy draining both tanks equally and leave them alone.

As far as shutting them off -- that's a good idea and up to the individual. For me it's just one more step to remember when launching after coolers, drinks, clothes, dogs, drain plugs, etc. so I leave mine set, plus I have three engines with two tanks and three shutoff valves -- figure that out each time.

Thanks 45Sonic, my sonics shutoff valves are hooked up correctly... I found out the hard way when I ran one tank empty, switched both engines to remaining tank then ran completely dry a mile latter. That made a sailor with a dingy a happy man to pull in a sonic offshore.

This raises another question I've wondered about, does the forward fuel fill go to the port or starboard tank? I suppose I could find out by running both engines off one tank then refueling but I have always ran off both tanks.

Just answered my own question, I suppose I could turn on the fuel gauges when refueling...

Thats what I do ... but seem to forget which is which cause I am too excited to launch it.