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Old 03-04-2019, 02:33 PM   #1
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3120DS Sunseeker Class C information

Looking for someone out there who has a 3120DS Sunseeker class C motorhome, mine is a 2012 and would love some insight on grey tanks and valve locations. I only find 1 black tank and 1Grey tank valve on the drivers side at the sewer connection. After dumping the grey tank I tried to fill up & flush the tank. The Manual states (1) 39 gal. grey tank. Trying to fill the holding tank up water backs up into shower after 20 gallons. Am I missing another valve or maybe 2 grey tanks instead of 1? Any information would really help
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Old 03-04-2019, 03:31 PM   #2
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If it's like the 3010, you have 1 gray and 1 black tank dump on driver's side in a compartment. On the same side there is a City water hookup and a black tank flush connection. The fresh water tank fill is on the passenger side. Are you trying to fill up the gray tank?
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Old 03-04-2019, 04:37 PM   #3
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My 2012 3100SS only has a black and a gray tank behind the left rear tire in a compartment with the electric cord. How do you know you are only back filling with 20 gallons?
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Old 03-05-2019, 12:19 PM   #4
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A 32 Deuce,

I thank again for your response, I tried to refill the holding tank by pouring 5 gal. buckets 1 at a time to see what capacity is on the grey tank, after 4 buckets the shower backed up when trying to add the 5th bucket. You reponded to me on the plumbing thread on the acorn clog followed your suggestions to no avail also removed the entire sewer valve assembly to grey valve backflushed and snaked and flushed water through system, no more debris came out. Have been trying to solve this problem since Jan. 5th My wife and I dry camp quite a bit and know that will not be possible until I know we can hold full capacity to be able to stay 5 or 6 days. 20 gallons can fill up in 2 to 3 days if using the shower much.

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Old 03-05-2019, 12:46 PM   #5
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Bill & Gail, I had a blocked grey line but got it cleared and tried to refill and flush grey tank by hand with 5 gal at a time shower backs up after 20 gal. Is your grey tank 39 gal?
My black flush connection is on the passenger side, I have 1 grey & 1 black dump valve in compartment behind rear tire
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Old 03-05-2019, 01:10 PM   #6
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They could have lied about a 29 gallon tank. I know mine fills after doing dishes all day and 2 showers the next morning. By myself I get 3 days out of the gray tank.
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Old 03-05-2019, 02:41 PM   #7
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I have a 3100 Sunseeker 2008 so not sure this will help , but I have 2 gray tanks on knife valve is beside the black tank valve behind the driver side rear tire. The other knife valve is on the passenger side behind the rear tire almost at the shower location. There is actually a sticker in the bottom mouldings where the knife valve is located.
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