Date:         Thu, 13 Feb 2003 14:42:21 +1100
Reply-To:     Steve Overmyer <s.overmyer@UWS.EDU.AU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Steve Overmyer <s.overmyer@UWS.EDU.AU>
Subject:      Re: Fuel tank pressurised
In-Reply-To:  <200302121557.h1CFvpU28252@cooper.uws.edu.au>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 10:52 AM 12/02/2003 -0500, you wrote:
>From:    Robert Donalds <bostneng@FCL-US.NET>
>Subject: Re: Fuel tank pressurized
>
>Adam=20
>the whoosh you are hearing is the air going into the tank not coming =
>out. This is most likely due to a bad valve for evaporative emissions =
>system. Trace the plastic purple vacuum hose from the intake manifold to =
>the valve. the valve most likely has a hole in it and that is pulling =
>air out of the gas tank you need to replace the valve.  =20
>Bob Donalds=20
>http:.//www.bostonengine.com


   I've never known exactly what caused the air-lock inside the fuel
   tank and maybe Bob has solved that question...thanks Bob :)

   I have had the same symptoms on 3 different occasions now over
   the past 5 or 6 years ...the fuel tank going woosh when opened
   and the tank going woomph after I stopped driving.

   Trying to locate the source of the problem lead me to the charcoal
   cannister (behind the RH rear wheel) and the two small vacuum hoses
   (the purple one & the white one) that lead from the valve on top up to
   the intake manifold and the throttle body (or whatever it is)

   Anyway,assuming (perhaps wrongly) that charcoal from the canister
   was blocking the valve or one of the lines,I would remove the canister
   and the two lines from the vehicle,shake the cannister to loosen any
   blockages,then run a thin wire thru the two plastic lines to clear out
   any possible blockages.I'd also blow air thru the valve to clear out
   any obstructions.

   Each time after doing this proceedure,the symptoms dissappeared
   and didn't return for several years.When they did,a repeat of the above
   sorted it out again.I never knew exactly what part of what I did actually
   did the trick but hey,it worked and only takes about 15 mins from start to
   finish.

   Before replacing anything,maybe trying this is worth a try...?

   Cheers,
   Steve O
   NSW Australia
   '92 Transporter WBX Kombi
   '68 Beetle
   '00 Transporter 5Cyl Double Cab
   '03 Transporter 5Cyl Double Cab (work truck)

   ex '76 Type 2 Double Cab 2.0
       '74 Type 2 Camper 1800
       '70 Mazda B1500 pickup
       '66 Jaguar MkII 3.8
       '65 Type 3 Station Wagon (squareback) 1500
       '64 EH Holden Station Wagon (an Aus GM owned car co)

    ...and what I ride,since it's a topic of recent conversation...

   On the road/trails:
   Specialized FSR Mountainbike
   Several commuter bikes of the road & cross varieties
   Also used to build custom tandems & 1 triple bike.

   On the rails:
   '48 Fairmont M19 linesman's car
   '60 Wisconsin powered SIC (superintendent's inspection car)
   '62 VW* powered ganger's car (currently being restored)

     * VW 1200 industrial engine thru a 3 speed Villiers gearbox
      Only 41 were ever built by the NSW Govt Railways and today
      less than 10 survive...