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Old 07-04-2016, 08:22 PM   #1
KC8RXQ
Senior Member
 
Brand: Thor Motor Coach
Model: Synergy TT24
State: West Virginia
Posts: 155
THOR #3433
Gray tank capacity for Citation/Siesta/Synergy

I apologize in advance if this is a re-post but I couldn't find where I logged the original.

My Synergy brochure indicates a gray tank capacity of 24 gallons but there is no way it will hold that amount before the it starts backing up into the shower pan. It is on my list of things for the dealer to check but I was wondering if anyone with the Sprinter Class C's in the rear twin bed configuration (Synergy TT24 or Siesta/Citation ST24) had a similar situation.

I did experiment with the capacity and measured around 12-15 gallons of water into the gray tank before the shower drain showed signs of starting to back up. Yes, the rig was very close to being level on both front-to-back and side-to-side planes but it's a mystery as to why such a difference between the brochure and actual capacity. I have gotten used to draining the gray tank when it registers 2/3rd full on the monitor panel just as a precaution.

Any thoughts or suggestions would be greatly appreciated.
__________________
Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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