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Looking at Jerry’s fuel schematics mine is a lot like that but my AUX tank is in the 1st front bay up against back wall opposing bay #2 It has plywood and carpet covering it but with a flash light I can see a small hose coming off the top of tank and heading probably to main tank it looks like a vent for AUX tank. Do you think Prevost or Royale(Monaco) Added Aux tank, Reason I’m asking is at the bottom of Main tank there is a 1 1/2 fitting to supply Aux tank with fuel.