Breather Pipe filling with water Jayco Outback 2015

If your saying that the breather pipes run up and down under the chassis with "dips", well the manufacturer has not done their job properly or a bad design. Being a 2015 model you should be able to get the dealer to rectify the problem, the sooner the better. It's basic knowledge for the manufacturer that airlocks in breather pipes hinder the filling of tanks through the filler cap.

hi
Breather must run gradually from top of tank to a higher mounting point . At a guess the tanks are filled till there is water coming out and at that stage the breather is filling up and then not self draining . The next time u fill u have issues . Either re route the pipe and or make the pipe bigger also will also help . Add 2nd breather to the opposite corner .Use semi rigid plastic pipe [truck air line ] less likely to get dips etc

The same function as older fuel tanks but they had there pipes
almost going vertical immediately upon exit
air pockets in top of tank [the water tanks donot]
multiple breather lines to tank

Have you got any bungs in the bottom of the tanks ?

If so, fit some taps and click on garden fittings and fill with the hose from there ( slowly ).
Keep filling until water flows freely out the breather(s).
This system works well, and as said, unless the whole setup has been done properly, filling from the normal inlet can be a real pain in the rear end !!

I did this mod to my van ( 2 x 80ltr tanks ) and even though it takes a good 10mins+ to fill, and you do get a bit of gurgling and water spitting out the overflow, it does get the tanks completely full.

Yeah, it's not common to your Jayco.

I experienced a similar problem with my Goldstream Camper Van soon after delivery.
Could hear the pump labouring when using the tap for any length of time and took ages to fill or empty the tank.

I removed the breather pipe from the top of the water tank and immediately heard the whoosh of air being sucked into the tank as the positive pressure was released. I checked the breather hose run and it also undulated along the underside of the floor and chassis cross rails towards the front where the filler cap is located.
I connected an air compressor to the removed end of the hose and with the filler cap removed, ejected the water lying in the breather pipe. Hmm I thought. This is crap.

I determined this was a design fault and installed a new breather hose out the back and up the rear bumper support arms, terminating at a fuel breather fitting.
All good now.

I had a similar problem with the grey water hose which ran from the sink on the left hand side and undulated across to the right hand side, before a right angle elbow directed it downwards. There was an air lock present that stopped efficient water flow when the sink plug was removed.
I ended up pulling the corrugated hose back rerouting the outlet down on the left hand side where the water can drain unimpeded into the grey water "snake", or a bucket.

Goldstream had/have a very good name but these two minor design errors or incorrect installation techniques left me a little bit peeved, after spending close to $50,000 for a new van.
It just wasn't worth the hassle for me to take the van back to the dealer for possible remedial repair work.. At least I know my fixes work.

Thanks for the input all, the way Jayco did the breather is through the bottom (via a drilled hole) of the chassis rail, back up the top across to the next chassis rail and then down again into through the next hole. Undulating is an excellent term. If they haven't got a fix on a most common problem they never are going to.

Was thinking along the same lines Sand Man, re-routing totally as you said and having a fuel type filter at the end coming out the rear. The only concern is that we will be doing a lot of gravel road travel, what about the dust coming in the filter. Haven't been back underneath to have a rethink yet. Major problems will go back under warranty, but things like this, it may take Jayco three weeks to work something out, better being done by oneself.

When we were filling from the mains, we thought it was ok. But filling from the gerry cans - what a waste of time. And we will be needing to fill like that at times. The 12v pump to drop into the container works a treat. Takes about 3 minutes for 20 litres. (The first 20 litres went in ok luckily)

Guess if there wasn't some refinement needed, blokes wouldn't have anything to ponder on the road or at home (says the wife).
Cheers

the reason for your blow back or slow fill problems is that most water tanks fill from the bottom, there for there is always water in the bottom of the tank. now when filling your tank/s you have a restriction at the tank entry / take off /drain plug point, your 25 mm fill hose is reduced to about 12 mm in this connection, also if like my jayco on the rear tank there is a u turn in the 25 mm hosecheck this point for kinks. ( i used 2x 90 deg. bends instead.) now each 90% bend and i have 3 the 2 i put in plus the one inside the connection slows the flow by about 5% for each bend.
now when filling your tank/s you have all those plus the water at the bottom of the tank..and when you try to fill the air in the 25 mm has to come out and the only way out is up the fill hose bugger!

the fix get a rubber foot off a chair or some thing that is a good fit on your hose /siphon hose .one with a nice tapper,,,now with a sharp blade cut the bottom off a bit at a time until you expose the bottom of the hole, or use a wad punch,. now slip this onto your hose about 200 mm tapered end to end of hose.. now when filling your tank slip the hose in the fill hose up to rubber foot to seal off now fill your tank. CAUTION make sure air vents are clear, easy way to check is to open the drain point at tank the water should come out in a nice stream if it is going glug glug glug there is a problem in the vent. jayco air vents terminate just near your fill point , careful when filling as when tank is full the water will come out of this vent
I have one on my normal hose which I leave on and put my click fittings on or off as required.I also have one on my siphon and pump hoses
no more wet arse and a full tank every time