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Old 01-12-2018, 11:55 PM   #1
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Smile Help with 09 Cardinal 31RK Tank Drains

I am a newbie with a 2009 Cardinal 31RK fifth wheel. I can only find two tank drain valves, one on the road side outside of the bathroom. There is a smaller diameter pipe connecting to a larger pipe just upstream of the drain valve. My RV supposedly has a black water, a grey water, and a galley (second grey) waste water tanks. The only other drain valve I can find is inside the 4" access portal near the rear corner by the refrigerator access hatch. I assume this drain is my galley tank. Is my main grey tank drain piped directly into my black tank? I have been told to keep my grey tank drains open and my black tank drain closed while using full hook-up sites, but can't figure out how.

I have a clear elbow at the far end of my sewer hose. Waste water drained out when I opened the drain valve, but the black tank level is now showing full. Is my black tank level indicator malfunctioning, or is my black tank drain stopped up?

Can anyone help me figure out my drain/valve configuration?

Thanks!
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Old 01-14-2018, 08:28 PM   #2
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Originally Posted by JH17778 View Post
I am a newbie with a 2009 Cardinal 31RK fifth wheel. I can only find two tank drain valves, one on the road side outside of the bathroom. There is a smaller diameter pipe connecting to a larger pipe just upstream of the drain valve. My RV supposedly has a black water, a grey water, and a galley (second grey) waste water tanks. The only other drain valve I can find is inside the 4" access portal near the rear corner by the refrigerator access hatch. I assume this drain is my galley tank. Is my main grey tank drain piped directly into my black tank? I have been told to keep my grey tank drains open and my black tank drain closed while using full hook-up sites, but can't figure out how.

I have a clear elbow at the far end of my sewer hose. Waste water drained out when I opened the drain valve, but the black tank level is now showing full. Is my black tank level indicator malfunctioning, or is my black tank drain stopped up?

Can anyone help me figure out my drain/valve configuration?

Thanks!
Whoever told you to leave your grey tanks open was offering an opinion. It's definitely not a "should." Empty the tank using the valve you think is the galley then close the valve, then run water in the kitchen sink - a lot of water. Then open that valve again. Does more water drain?

My galley valve is located through the frame near the kitchen area. My bathroom grey and black valves are located in the "convenience center".

It's pretty easy to get tissue or other solid wastes screwing up the sensor. If you have a black tank flush, use it. If not, run a hose down the toilet and try get some water moving. Dump, refill and repeat this as necessary. Adding a bag of ice to a 3/4 full black tank and driving around for a while is totally old school, but works as well.
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Old 01-14-2018, 09:16 PM   #3
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There should be level indicators for all 3 tanks. My 08 Cardinal has level readings for Fresh, Black, Grey 1, and Grey 2. I don't have a rear kitchen so I can't tell you where your tank valves are, sorry.
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Old 01-23-2018, 03:08 PM   #4
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Quote:
Originally Posted by JH17778 View Post
I am a newbie with a 2009 Cardinal 31RK fifth wheel. I can only find two tank drain valves, one on the road side outside of the bathroom. There is a smaller diameter pipe connecting to a larger pipe just upstream of the drain valve. My RV supposedly has a black water, a grey water, and a galley (second grey) waste water tanks. The only other drain valve I can find is inside the 4" access portal near the rear corner by the refrigerator access hatch. I assume this drain is my galley tank. Is my main grey tank drain piped directly into my black tank? I have been told to keep my grey tank drains open and my black tank drain closed while using full hook-up sites, but can't figure out how.

I have a clear elbow at the far end of my sewer hose. Waste water drained out when I opened the drain valve, but the black tank level is now showing full. Is my black tank level indicator malfunctioning, or is my black tank drain stopped up?

Can anyone help me figure out my drain/valve configuration?

Thanks!
We own an '07/'08 31RK.
One valve is at the back below the power plug connector (this is for the Galley grey) the opening above the drain Pipe has two handles inside (one Black right, one Grey left) all three tanks drain from the one connection. Hope this helps.
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