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Old 06-07-2015, 03:15 PM   #1
Arjohn
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Black water flush leak.

Well I have a 2011 Keystone sprinter and went to flush out my black water tank with the flush attachment on the back of the camper. I made sure the black water valve was open so I hooked the hose pipe to it and turned the water on. In the bathroom there is a access panel on the wall behind the toilet and water was coming out of there all over the floor. Has anyone had this problem before. Thank for the help.
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Old 06-07-2015, 03:44 PM   #2
chuckster57
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Welcome to the forum

This subject has been discussed in several threads. If you search using "anti siphon valve" I'm sure you'll find enough threads to flood your senses.

Some replace the valve with a new one, some replace it with a brass one, some take it out and use an anti siphon valve at the exterior connection. What ever you decide, don't just take it out and call it good.
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Old 06-07-2015, 03:57 PM   #3
therink
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Yes, very common problem. No need to worry unless you let it run while leaking for a long time.
There are 3 possibilities that I know of:
1) Pex fittings at the anti siphon valve are loose/leaking. This happened to me during my pdi walk through at the dealer when it was brand new. Tech tightened the fittings at that time and is hasn't leaked since.
2) The valve was installed backwards (common). Remove, reverse and reinstall it.
3) The valve wasn't winterized since last year, it froze and cracked. Replace it. Can be found at HD/Lowes for under $20.

If you haven't located the valve, it is likely behind the bathroom sink up high. You will see two water lines running upward behind the sink (in addition to the hot/cold water supply for the sink faucet). Good luck.
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Old 06-08-2015, 04:41 AM   #4
cw3jason
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Very easy to remove and test. It is a check valve with a vent. It's called a vacuum breaker. Water pressure actuates the valve and directs it to the tank, sometimes it can get stuck, half open and closed causing a leak. Pull it out and inspect and test it.

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