Weird grey tank overflow

Originally posted by GlueGuy You should have a pressure reducer on the city water inlet. We usually attach ours to the spigot that the campground supplies. This will reduce the pressure to both your rpod, as well as the supply hose. We also have a filter on the city water inlet that goes between the hose and the rpod. So the hookup goes like this: city water -> pressure reducer -> supply hose -> filter - rpod.

+1, there is no path from fresh water to gray tank. I have reoccurring issue with city water going to FW tank. I spent 4 days at the ERU and on final day my fresh water tank was 1/4 full. Before that it was empty. My next step is to pull water pump and inspect.

Scott,

FR is notorious for loose plumbing fittings. Seems their assemblers are either weak or untrained. Lots of folks have had massive plumbing leaks after the first road exposure. I had shower water running all over the floor and found the P-trap not even hand tight. That's probably not your exact problem but there could be a loose connection on the supply side of the shower sink. It may be possible for water to run down from there to the shower pan and into the gray tank. Water, especially under pressure, can do strange things. If there is a loose fitting it could be spraying somewhere and following a circuitous (engineering term) path to the shower pan. As I recall there is a small access hole below the sink or you might have to remove the sink. Easy enough to do. I no longer have my Pod so I can't be exact.

Not to be nit picky, but a bad check valve in the pump will fill the fresh water tank, not the gray. The symptom is an overflow of the FW tank out the overflow or city water connection. Sounds like an answer from the marketing dept. The pump check valve is inside the pump and most problems arise from some dirt or sand preventing the valve from seating. The first attack is to cycle the pump several times (with city water disconnected) to try and dislodge the dirt. If this doesn't clear it I believe the valve can be replaced but it requires disassembly of the pump. Search the internet for help on your pump model.  

Yeah, got the BW flush figured out.  I'm thinking a faucet must have been maybe a little open and I didn't hear it because of the AC.  With high pressure on the line from the hose, that might have pushed a fair amount of water out, eventually filling the tank.  Now, some water did flow out over the shower pan, but virtually all of it seemed to drain out underneath.  The floor inside the trailer only had a small amount of water visible--like easily mopped up with a towel.  Is there a secondary drain under there?  Should I worry about water damage?  The weather has been hot and dry, and we did a three + hour drive home in 90+ temps the day after the incident.  I think it's pretty darn dried out now.  What should I check?

Thanks.

Scott