Very few modern-fuel injected cars have filters before the pump. The
main problem with a pre pump filter is that any restriction on the
suction side of the pump will create a vacuum and cause the fuel to
vaporize or even boil at the pump inlet. Particularly in warm weather
this can create vapor lock problems, intermittent, unexplained fuel
starvation etc. This is probably why VW discontinued the pre pump filter
although vapor lock is rare on these vehicles. It is a major nightmare
on some of the CIS cars.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of The Bus Depot
Sent: Tuesday, April 19, 2005 9:43 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: NEED GAS TANK

> Beware the aftermarket tanks - I got one for my GL, and it
> fit OK except for one fitting at the bottom, where I had to
> braze on the fitting from the old tank - the new one was the
> wrong size.

Let me guess - you have a '90-91 Vanagon, or at least one that lacks a
fuel
filter before the pump. Sometime in 1990, VW did away with the pre-pump
fuel
filter. Since that filter had a different sized inlet and outlet, this
necessitated a different diameter fuel line from tank to pump - hence a
different sized nipple on the tank. Since this tank is fairly rare, it
is
not generally available aftermarket. But there is an easy workaround.  A
simpler solution than brazing in a new fitting is to simply add the
pre-pump
filter (and fuel line), which also provides a little extra filtration
protection for the pump (not a bad thing).

- Ron Salmon
  The Bus Depot, Inc.
  www.busdepot.com
  (215)  234-VWVW

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