My boat is only pulling gas from the port tank. I looked in the owner manual and it shows valve controls for each tank plus one for a generator (which I do not have). It says they are on the forward wall of the engine compartment. I have looked all over and don't see anything. I contacted the previous owner and he had not seen these valves. On an older model they were inside the cabin under a cushion and easily accessible and no mistake what they were. Any help would be greatly appreciated. Thanks