Wash / Livewell pump - unwanted water flow

[abl1111]

Took my boat out for a spin yesterday - all went great ! Need a prop change and she will be perfect ( from a 24 pitch to a 22 pitch ( Bravo III ). She flies !!! Clocked at 52 mph @ 4800 rpm's

My question: The thru hull pick-up for the livewell/washdown is allowing water to JET through the pump, when the pump is off, and out through a s.s., capped hose fitting. The water is being being shot out the s.s., capped/sealed hose fitting - under enormous pressure. I do have a bronze valve at the intake to open and close the water from getting to the pump ( I like to leave it open all the time )- and I don't want to have to open the engine compartment every time I want to use the washdown...

Any ideas ? My thoughts:

If I leave all as is, I can connect a hose w/ a spray nozzle at the end and hopefully that would prevent the unwanted spray - however the pump itself would still be getting that enormous pressure and blow-by. And there is no guarantee that the hose/nozzle would stop this water pressure.

Or, I can add a gate valve somewhere and that would definitely stop the spray but again, what (-) effect would it have on the pump ?

Thx...