305 express fuel valve question

Tony Z

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Joined
Mar 18, 2026
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Age
74
Model
Express 305
I'm a new owner of a 2015 305 express it has 2 tanks a main and an auxiliary although they are very close capacity wise I have two fuel manifolds problem is they are not marked so I am unsure as to whats what. I know the middle lines go to the motors but which tank is which and which valve position is for what tank is not very clear anyone that can shed some light on this I would be great full.
Wonder 2hy grady didn't label them?
 
The forward position is for the AUX tank, The rear position is for the Main tank. Or if you are facing the valve then to the left is the AUX tank, and to the right is the Main tank. My boat has the orange placard above the valve.