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Old 02-08-2016, 03:52 PM   #1
T_Clark
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Join Date: Jan 2016
Location: Conyers, GA
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black water clean out connection leaks

2016 Passport Ultralite 2770. Maiden voyage was this past weekend. Everything worked but 2 items.

1. Found out if you leave the bathroom door open, it blocks the intake vent for the furnace and apparently the furnace somehow overheats and when it shuts down, takes several hours to start back. Couldnt for the life of me figure out what was going on, thought maybe the tstat was messed up, but once we kept the bathroom door closed, unit worked perfectly the rest of the weekend.

2. And this one is what this thread is about.

Decided to dump and flush the blackwater tank there at the campground before we left since they had full hookups and i knew i wouldnt be holding anyone up while i flushed the tanks clean USING THE BUILT IN FLUSH SYSTEM. As per the picture attached, the hose comes from the outdoor fitting into the bathroom under the sink. It turns up and goes thru some sort of vent thingy (i have no idea what this is and this is the part that is leaking) then goes out and down to the black tank.

Just what the heck is this thing, (i'm assuming its some sort of vent altho i cant figure why it would be needed.) And surely its not supposed to be leaking out the TOP of it. The screw on fittings are tight, and the fittings themselves are not leaking. Its spraying out from under the top of the square plastic vent looking thing.

I'm tempted to just do away with this and install a 90 degree fitting there so it goes straight down to the black tank, but would like to know if its needed, and if its not supposed to be leaking (which its not), then i'll call the dealer i bought it from and get them to send me a new one.
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Old 02-08-2016, 04:48 PM   #2
CFDfireman90
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What you have there is a check valve. Designed to keep black water from siphoning back up and into the clean water connection for rinse water. It is not uncommon for them to be installed backwards. They also tend to fail and do the same as you describe. I removed mine during my first season and purchased one that goes between the hose and the connection on the outside of the camper. There are lots of posts about this issue on this forum and others.
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Old 02-08-2016, 05:39 PM   #3
T_Clark
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Quote:
Originally Posted by CFDfireman90 View Post
What you have there is a check valve. Designed to keep black water from siphoning back up and into the clean water connection for rinse water. It is not uncommon for them to be installed backwards. They also tend to fail and do the same as you describe. I removed mine during my first season and purchased one that goes between the hose and the connection on the outside of the camper. There are lots of posts about this issue on this forum and others.
figures. that is what i will do as well.
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Old 02-09-2016, 05:53 AM   #4
cw3jason
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It is commonly known as a vacuum breaker check valve and as stated it prevents a syphon effect that would pull black water from your tank when disconnecting the hose by opening and letting air into the system. It is supposed to close under water pressure allowing the water to enter the black tank. it is just a simple valve seal with a spring and could be stuck. Removing it and actuating it then putting it back should solve the issue. It can also be replace with a brass one. Google vacuum breaker to see examples. Also make sure you use adequate pressure when flushing, as water pressure is what closes this valve and makes it operate.
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Old 02-09-2016, 09:05 AM   #5
T_Clark
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Originally Posted by cw3jason View Post
It is commonly known as a vacuum breaker check valve and as stated it prevents a syphon effect that would pull black water from your tank when disconnecting the hose by opening and letting air into the system. It is supposed to close under water pressure allowing the water to enter the black tank. it is just a simple valve seal with a spring and could be stuck. Removing it and actuating it then putting it back should solve the issue. It can also be replace with a brass one. Google vacuum breaker to see examples. Also make sure you use adequate pressure when flushing, as water pressure is what closes this valve and makes it operate.
yep, as i said, i plan to remove the one inside the unit and put a straight thru fitting, then i'll put the one way on the outside.
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