Different Vanagons have different size hoses.  There's a configuration that has a pre-filter with a 12mm barb fitting on one end and a 10mm on the other.  I now have one of these filters in a box.  And there is also a configuration with 12mm fittings at both ends.  This is what I and many others needed.  The 14mm (1/2") fittings on both ends of this NAPA filter worked quite well for this situation.
 
Jeff
 

________________________________

From: Jim Thompson [mailto:jim@karmannghia.com]
Sent: Tue 8/24/2004 12:26 PM
To: Warner, Jeff (DSIO); vanagon@GERRY.VANAGON.COM
Subject: Re: Pre-filter success

14mm is an awful tight fit for the 11 or 12mm factory hose to fit and when
using 14mm (5/8") fuel hose on 10mm hose barbs on the fuel tank/fuel pump
can result in the hose end(s) to "fold" (or deform) and not seal properly
when clamping them down.  I would continue to search for a fuel filter that
had at least 5/16" to 1/2" ends to fit the existing factory hose.

My nickel's worth

Jim Thompson
oldvolkshome@earthlink.net
jim@karmannghia.com
http://www.oldvolkshome.com
***********************
----- Original Message -----
From: "Warner, Jeff (DSIO)" <Jeff.Warner@DLA.MIL>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, August 24, 2004 6:58 AM
Subject: Pre-filter success

Volks,

A few weeks ago the subject of pre-filters came up again and someone
suggested a vendor that could supply a filter that had 14mm hose
connections.  Figuring that was close enough to the required 12mm to
probably fit, I purchased one.  Since they had a minimum order of $20 I also
bought a nifty collapsible lug wrench.  That plus nearly $10 for shipping
meant I was spending 30 bucks for a filter!  Oh well, at least I would
finally have it and the lug wrench looks nice under the bench.  What I got
worked perfectly and was a NAPA filter (NAPA Gold 3299).  So there you go,
if you need a pre-filter with large hose connections at both ends, visit
your local NAPA dealer and I'd be willing to bet you'll pay a lot less that
30 bucks.  I'm going to go buy another one to improve my average cost. ;-)

Jeff Warner
Galloway, OH
'86 Wolfy Westy "Barry"