Today I picked up an older Nova, with the all-metal pump and CEJN fitting. The female fitting on the pump seems to have the locking collar stuck in the rearward position ( near the pump) so it will not move forward to lock the male end of the fuel line into place. Previous owner says it was used "maybe three times" and mentioned something about "a beach". Could there be sand or grit preventing the collar from closing? Due to the rusty condition of the Coleman fuel container he gave me I suspect it has not been used in many years. I have tried light oil in the collar and a lot of pulling it back and forth (it moves perhaps a 1/64th of an inch) with no success. Any suggestions?