I just bought a 1992 Rinker 260 Fiesta Vee that has a pump out toilet with a selector switch (wet/dry). The instructions on the toilet say to place the selector to wet and pump until water fills the bowl and flushes. Then switch the selector to dry to remove any remaining water. I can get water to pump into the toilet but it wont flush....it will just fill completely to the top and overflow if i continue to pump. Also, water does not pump out when I switch the selector to dry. I am not sure if the problem is that I am not doing something correctly or if there is something wrong with the toilet. I know that the toilet has not been used since the last winterization so I am wondering if there is maybe a shut off switch somewhere on the out line to prevent water intering the waste tank? Please Help.