[VB] Gas Cap VEnting problem?

[david raistrick]

this might help:

https://www.thesamba.com/vw/forum/viewtopic.php?t=282868

> Though not German, a Stant 10623 stainless vented or a Fram RG23 7195514 zinc vented are exact bus gascaps.
> looks like 10623 is superceeded to the 11623. I just put it on a radiator cap tester, and it is vented. Also had em send a Balkamp (NAPA) cap # 703-1220 over and it looks identical, and is vented as well. I will look for a OG cap but these will do for now for 5.00.




On Fri, Oct 20, 2017 at 5:04 PM, Kevin Guarnotta
<kevin at guarnottadesign.com> wrote:
> I think my cap is original - it has a VW logo on it. I just changed the gasket on it. Is there a spot I can see what an original looks like to compare? Or is there a way to test the cap to see if it is vented?
>
> -Kevin Guarnotta
> Jamaica Plain, MA
>
> ’78 Westy
> '69 Singlecab
> '65 Ez-camper
>
>
> -----Original Message-----
> From: david raistrick [mailto:keen at icantclick.org]
> Subject: Re: [VB] Gas Cap VEnting problem?
>
>> What would cause this? I know the gasket/seal on the gas cap is relatively new, and it is generally pretty tough to close the cap - as it is so tight. It is a rubber one. Without going through my notes - I put on a few years ago. I think these were originally cork, should I go back to the cork style.
>
>
> get rid of the cheap and common cap that doesn't vent.   it will crush
> your tank by vacuum if you run it out a few times....
>
> split bus tanks require a vented cap.
>
> (I dont have a split bus tank anymore, so I can't speak to source.
> but they exist - find a used or nos original cap and regasket it.  if you have your old cap, swap the gasket to it.)