Chris Braymen wrote:
> 
> >> Being a new owner of 85 Westy, I'm surprised that every time
> >> I fill it with fuel it overflows out the filler tube onto the ground.
> 
> >I get this as well. I also would like to know if it is normal, or whether I
> >have a leak in the filler neck or something.
> 
> Also happens to me in my 84 Westy and I just had the whole tank-filler
> assembly replaced...so I'm thinking it's normal...I hope.
> 
> Chris

Maybe this will narrow down your search for the cause:

 I have recently replaced my lost '81 Westy gas cap with one from an
'84. (I thought that it looked nicer, and you can't lose a cap that
needs the key to open it) Well fellas, now mine is leaking too!!! I
think it's those %#@$ later model caps! Maybe it has to do with the key
hole being a vent or something. Your guess is as good as mine, but I
know and easy cure...buy an '81 cap! (NO!! Anything but that!!! ;) 

(New tank and filler neck in mine too, I also rebuilt all other parts
around the cap.)

Noel