Wash / Livewell pump - unwanted water flow

[Dave Hirshberg]

I may have misunderstood your post. If you've got a bad cap then you've got a bad cap. If you want to reduce the pressure on the system while running then drill some holes. It will reduce the pressure. If your plumbing and pump are ok with outside pressure then don't mess with it. Some pumps are not affected by the extra pressure. Hope this helps.