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I think this may answer the original question, and also the spluttering when filling up, at least in terms of what happens on our van.
I don't know whether this is standard on a Hymer, or an after fit item, but it's just a tap like used in beer making or some such other pastime.
When filling up, it's manually opened to expel air, and when it starts chucking water out, the tank is full.
When tank full, just close the tap.
If tap isn't closed after filling, we can be tracked by the following the stream of water on the road for a good few miles
There is a one way valve on the overflow, to stop air being sucked in, and there is also a breather pipe at the top of the tank, with a one way valve, where air can be drawn in, but not expelled.
Both these pipes come from a t-piece fitting on top of the tank.
NOOOOOO that would be way too obvious
[QUOTE=cabby;2108673]So have you looked to see if the overflow pipe has dropped from a securing strap,or have you re-routed the pipe to rise above the tank height.
The pipes are in the same position as when we bought the van (new) I haven't seen any clips. Just think it's a poor design.
I wonder if the purpose of the "overflow" pipes is to let air out of the tank as it fills with water?
When I'm topping up the tank with a watering can if I'm on site and don't want to move, I have to pour water in fairly slowly or I get an airlock and it gurgles and spits water out of the filling hole.
So have you looked to see if the overflow pipe has dropped from a securing strap,or have you re-routed the pipe to rise above the tank height.
I wonder why they put them there though, as the inlet caps can breath.
Nope, i've got a gurt hole in the side of the van where I pour water in, when the tank is full it spills out of the hole around the sides of the hosepipe that fills it. I then put the cap on and the job's done.
Water then remains in the tank instead of spilling out over the road as I drive along. I used to find that my tank contents dropped by about 25% over a 50 mile journey before I fitted the valves.
Originally Posted by Kev_n_Liz View Post
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