re valve

[Dpack]

I have a new to me flowrite system I'm trying to get happening. Waiting on a new replacement pump cartridge that I think will rectify my issues but in the meantime I have some questions.

When in auto position should the well drain when on the trailer?

When in the water on auto it would only fill to the level of the drain overflow (top of strainer). This is only an inch or so in the bottom of the well. Hoping this is due to weak pump.

When using auto how does the valve stop water exiting through the transom when on a plane and why wouldn't it do the same when on trailer?

Thanks

Dave