Do you have a water pressure regulator? We borrowed my cousins 5th wheel to live in for a few weeks until the insurance company could get us something to live in when our house burnt (we didn't have our Jayco yet, had an older 28' camper with no slides). Anyway, the pressure relieve valve was leaking. So I swapped it out. The new one was leaking. Installed a pressure regulator all was well. Funny store to go along with this, then when we moved into our new house, the toilets kept running. We called in the plumber and finally the water company, we had almost 150 PSI of water pressure there at the house. That is why the relieve valve was leaking on the camper.
1999 Silverado 1500 ECSB 4x4 5.3/3.73s
2009 Jayco 32BHDS