Im not 100% sure but I dont think they will let u fish a comp using manual refill. I would have thought u would need a pump to fill the tank with. Not a hard thing to do. U could just run a pipe over the back of ur transom to a bilge as a temp measure, or if u want to make it more permanent run a through hull fitting to a pump, just make sure if u do this u install a seacock.
Maybe some of the guys who fish the comps could give us their thoughts.