[stiffwind]

Problem: I have a 1986 Passport 37 (new to me as of last year) It has both starboard and port 30 gal stainless water tanks under the settees. I just realized that the port tank is not operating, in other words water is not being drawn from that tank. I realized it when going to fill the tanks that I thought I had emptied in the fall. But the port tank was still full. Also, when i pressurize the system with just the port tank water valve on, the pump continues to run suggesting that pressurization cannot occur....but when I turn on both port and starboard valves, the pump seems to pressurize the system and then turns off. It seems obvious that the pump is just functioning to the starboard water tank? Any ideas where the problem is?

 

[JiffyLube]

Maybe one of the water tank valves is stuck in the closed position.

 

[sailingdog]

Are you sure when you're using the port tank, water is getting to the pump.. . If the water isn't flowing, you would get the pump running but never pressurizing... check the valves per Jiffylube's suggestion.