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OldRacer's avatar
OldRacer
Explorer
Feb 08, 2016

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.

  • so are you saying i should find a better quality one, or i could do what i was talking about and just do away with it. Chances of me EVER having black water get THAT far back up the system are slim and none.
  • That is the world famous 'anti-siphon vacuum breaker' that RV MFG. is required to install so contaminated water can not back flow into potable water system.

    They are junk...........better style ones are available

    Now for a basic course.
    Connection for flusher is in side of RV and above top of black tank
    Connection has a 'check valve' inside that fitting (just like city water connection)
    Line goes from connection up several feet to the anti-siphon device
    Line then goes back down several feet to black tank
    Flush nozzle is in side at top of black tank

    SOoooooooooo
    Black tank has to get completely full then yucky water could be forced thru nozzle and up thru line to anti-siphon device then back down thru line to connection then thru the check valve and into hose in order to possibly contaminate potable water supply.
    Guess if you had a poop fountain blowing out black tank roof vent yucky water could get into flush line and down to connection and then check valve be stuck open and hose still connected and potable water supply was down some of that yucky water could get into system.

    Possibility YES-------probability Pretty LOW

    Just saying...not recommending cause I've been accused of using common sense vs following 'standards'