That's a bad check valve in the city water hookup box, which I assume is the original Delta Six design. Time for a replacement, and I highly recommend the Go Westy replacements: http://www.gowesty.com/ec_view_details.php?id=23580&category_id=127&category_parent_id= 

It's unlikely to leak into the van, so you could just cap it off with a hose end cap if you don't use city water.

Stuart

---- Spencer Allen <spencervw@AOL.COM> wrote:
> Hi all.The last few times I filled the water tank in my 85 westy and then turn on the faucet water squirts out - more like dribbles- from under the flap where you would attach a hose for city water. I don't think there would be much back pressure from the small pump that would force water out at the  connection. It dribbles down the outside of the van but I'm worried it also may be leaking down the inside behind the kitchen. Any ideas on this?
> spencer

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David McNeely