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Old 05-06-2013, 09:38 AM   #1
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Holding tank question

Hey everybody, just bought a 2014 salem hemisphere 356qbq. This is my first 5er but not my first camper. Just took it out for the first time this weekend and when I pulled up to the dump station and pulled off the cap water went everywhere. I thought my valves were open but they weren't. After I finished emptying my tanks there and pulled forward to empty my back tanks it was the same deal. Anybody ever had this happen? Where did that water come from?!? Thanks for the help everyone.
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Old 05-06-2013, 09:44 AM   #2
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Hey everybody, just bought a 2014 salem hemisphere 356qbq. This is my first 5er but not my first camper. Just took it out for the first time this weekend and when I pulled up to the dump station and pulled off the cap water went everywhere. I thought my valves were open but they weren't. After I finished emptying my tanks there and pulled forward to empty my back tanks it was the same deal. Anybody ever had this happen? Where did that water come from?!? Thanks for the help everyone.
Would guess someone left the valves open with the cap in place and then sometime later closed them. That's why I keep a clear elbow on and cap it so there are no surprises. I even put a stainless screw in so it won't be taken off accidently.
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Old 05-06-2013, 09:50 AM   #3
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I didn't even think to leave the elbow on then put the cap on over it, good idea!
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Old 05-06-2013, 09:56 AM   #4
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Would guess someone left the valves open with the cap in place and then sometime later closed them. That's why I keep a clear elbow on and cap it so there are no surprises. I even put a stainless screw in so it won't be taken off accidentally.


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Old 05-07-2013, 08:50 AM   #5
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Buy one of these and leave it on.

It will prevent wet stinky shoes in the event of:

1) Joker who pulls handle then closes it at rest stop.

2) TP trapped in tank valve when closed and causes slow leak over time.

3) Forgetting to close one on previous dump.

3 " Twist on Waste Valve RV Holding Tank Valve Replacement Valterra T58 | eBay
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Old 05-10-2013, 12:51 PM   #6
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Well I figured out the problem yesterday. There is a third gray tank valve in the middle of both dump gates that the dealership didn't tell me about and of course it was open. It's the gray tank for the kitchen sink. So glad it wasn't a hidden black tank!
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Old 05-10-2013, 01:45 PM   #7
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Well I figured out the problem yesterday. There is a third gray tank valve in the middle of both dump gates that the dealership didn't tell me about and of course it was open. It's the gray tank for the kitchen sink. So glad it wasn't a hidden black tank!
However, you may want to still take Lou's advice. I did the same thing he did because of leaks through closed valves. This will let you get your hose on before you open the valves.
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Old 05-10-2013, 03:08 PM   #8
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However, you may want to still take Lou's advice. I did the same thing he did because of leaks through closed valves. This will let you get your hose on before you open the valves.
While I do not recommend doing this with Hosrt Probes (standard Gray water probes stick way out into the tank and can attract paper and debris), the end of line valve has another "undocumented" feature when boondocking.

Since the gray water tank typically fills a lot faster than the black, some RV'ers (typically NASCAR campers) use the end of line valve to transfer gray water to the black water tank. They wait until the gray is full, and with the end valve closed, open the gray tank valve. This dumps gray water into the manifold.

Now open the black water tank valve. The higher level in the gray tank will try to equalize by rushing into the black tank. After a few "potatoes"; Close the black valve. Up to 5-8 gallons of gray water will whoosh into the black tank. If done quickly enough, very little (if any) black water will enter the manifold.

Dump as normal; just remembering the mast is full of gray water to the end of line valve.
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Old 06-30-2013, 11:12 PM   #9
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Well I figured out the problem yesterday. There is a third gray tank valve in the middle of both dump gates that the dealership didn't tell me about and of course it was open. It's the gray tank for the kitchen sink. So glad it wasn't a hidden black tank!
Does this mysterious middle gray tank flow into Gray #1 or Gray #2... neither? I had the exact same thing happen to me and I haven't been able to figure out how to get the caps off without getting wet yet... perhaps I'm a little challenged. lol
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Old 07-01-2013, 09:10 PM   #10
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Mine flowed into the one that's at the front of my fifth wheel. I have 2 grays and one black in the front and one gray and one black in the back.
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