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Old 08-20-2010, 09:12 AM   #1
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Join Date: Aug 2010
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Fresh water tank

Was wondering if anyone knows the size of the fresh water holding tank on a 1993 Thor Ambassador 330Q? I need to clean the tank out with bleach and do not have a manual for the holding tank sizes.


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Old 08-20-2010, 10:59 AM   #2
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Join Date: May 2010
Posts: 271
Tank capacity

Here's an easy way:

1st step:.You can always "time" the input of the hosepipe to say, 30 seconds. Pull the drain and measure the runout amount. Armed with this, just fill the tank (watching the elapsed time interval). Divide to get the capacity.

2nd step: drain off exactly 5 gallons & leave the remainder in the tank.

3rd. step: add **diluted bleach to form 5 gallons & pour this into spout

4th: Move rv so that it splashes on roof of tank. Let it set for hours.

5th: rinse with fresh water, [vinegar or baking soda ..if necessary for taste]

**[Assume you know "not" to add full-strength bleach; rather dilute it extensively before it enters the RV system.]

Here's an excellent primer on mix ratios, courtesy Tiffin RV.Network


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Old 08-20-2010, 01:14 PM   #3
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Thanks, looks like it is a 60 gal tank. Also, since were are on the subject of water tanks I see that the tank is not level. One side is on a piece of wood that leaves the tank unlevel by about 1". Should I try to level it up by placing another piece of wood under the other side or is this intentional?
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