AAV

Hello comunity!!! I need help,

I own a 2001 Monterey 302 boat with an RDS MFG aluminum tank P/N 58942 290 (45 Gals) and I can get only about 6 gallons of water when I turn on the pump, I checked the tank and it is full of water and is not leaking, the suction port is in an unreachable location and I intend to install a new suction port. Anyone has a diagram for that tank???