Water Tank

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Water Tank

Post by Duncan2017 on Sat Feb 18, 2017 8:46 am

WE have recently bought a 1997 Executive which is our first motorhome. 
I have noticed that when I fill the water tank, until it comes out of the filler neck, water continues to run down the sides of the water tank for a while afterwards.  My question is; is there an overflow or vent on top of the water tank?
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Re: Water Tank

Post by Gromit on Sat Feb 18, 2017 9:21 am

There is on ours, and almost certainly will be on yours. smile!

Welcome to the forum. This site may be useful if you are not already aware of it.

http://zappysblog.co.uk/motorhome-articles/cleaning-water-tanks-and-containers-in-motorhomes-rvs-caravans-and-boat/

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Re: Water Tank

Post by Duncan2017 on Sat Feb 18, 2017 9:35 am

Thank you for the information
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Re: Water Tank

Post by Paulmold on Sat Feb 18, 2017 10:00 am

The overflow on tanks are simply open holes on the top, so the water should run from there well before it comes out of the filler neck. I have filled up whilst watching for the overflow to tell me it's full rather than have management inside watching the guage.

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Re: Water Tank

Post by bikeralw on Sat Feb 18, 2017 4:40 pm

The overflow on mine is via a half inch vent hose that opens high up in the neck of the filler tube. No holes in the top of the tank, which I would've thought was asking for dust and muck to be drawn in.
There are however overflow holes in the top of the waste tank where contamination is not an issue.
Al.
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Re: Water Tank

Post by Duncan2017 on Mon Feb 20, 2017 10:33 am

Thank you for the information and Zappys Blog was interesting.
Having thought about it and had another look over the weekend I would agree with bikeralw that an open hole on top of the tank would be asking for muck to enter the water system and our Executive is the same in having a half inch hose running down from near the top of the filler pipe.  Why would it have a hole in top of the tank and a vent hose near the top of the filler pipe?
My other thought now is that maybe where the filler pipe enters the top of the tank the fitting is loose and water leaks out when the tank is full and continues to drip until all the water in the filler hose has leaked out.
Has anyone with more experience than us had a similar problem?
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Re: Water Tank

Post by Peter Brown on Mon Feb 20, 2017 2:38 pm

Our 1999 Dutto had holes in the top 4 corners of the tank to vent. Each hole should have had a nylon insert that was pushed up to seal the vent by surging water, outside it was like an umbrella shape to allow breathing but keep muck out.

I didn't know this, I just knew that every time I braked I lost water and never arrived on site with more than 2/3 of a tank.

After much consultation with my dealer and the service centre I went to the service centre to have the problem rectified. With the tank dropped the technician showed me the vent system and identified the inserts were missing from the front.

At the technician's suggestion he blocked off the existing vents and installed a new breather pipe to the vent in the filler. No more problems.

My later coachbuilts have all have a vent port in the top of the tank with a short rubber hose looped through a 'p' clip screwed to the underneath of the floor. Very effective and clean.

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Re: Water Tank

Post by inspiredron on Mon Feb 20, 2017 3:04 pm

Peter Brown wrote:My later coachbuilts have all have a vent port in the top of the tank with a short rubber hose looped through a 'p' clip screwed to the underneath of the floor.  Very effective and clean.
I must have a look when I get underneath to clean my water level sensor studs!

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Re: Water Tank

Post by Duncan2017 on Sat Mar 04, 2017 10:58 am

Thank you all for your help and advice. 
I have now had a good look underneath, spoken to the dealer that we bought the van from (although not an Autosleeper dealer they were very helpful) and the Autosleeper staff at the recent NEC show and the problem is now solved.
The tank is built with breathers in the top which is obviously the level to which it can be filled.  So when I was trying to fill to the top of the filler neck all that was happening was the excess water in the fill pipe was draining out of the breathers and it was not a leak as I had first assumed.  Always dangerous to assume things!
The filler neck and cap assembly in the side of the van has a short breather / overflow hose built in to it.  This assembly is bought in by Autosleepers and they use the part as it comes even though the overflow / breather hose is not required on the Executive as it has the breathers in the top of the tank.
Hopefully problem solved, we are both happy again and have a lot to learn about the workings of our van.
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