How about totally automated?  A couple of open lines between the 2 tanks (on the upper level and lower level) so it's self-leveling......

Mike B.
  ----- Original Message ----- 
  From: Sudhir Desai 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Saturday, January 02, 2010 9:15 AM
  Subject: Re: HasenWerk 2010 Grand Opening

  To make it a bit more automated, but just as simple, the transfer pump
  could kick in when the resistance on the fuel guage (assuming you have
  a working guage), goes up/down to the quarter-tank resistance, and
  back off when it goes to the three-quarter-tank resistance.

  Sudhir

  On Fri, Jan 1, 2010 at 22:13, Al Knoll <anasasi@gmail.com> wrote:
  > The Feynman solution to the pickup and such on the aux fuel tank is to
  > simply use the tank as a transfer tank. A simple pump is used to transfer
  > the contents to the main tank when it is empty enough. Can be done
  > underway. No dual fuel pumps, no high pressure lines, just a transfer pump
  > and switch and of course a working fuel guage on the main tank.
  >
  > "Things should be a simple as practicable, but no simpler"
  >
  > Al (AH-1 gunner)
  >
  > On Thu, Dec 31, 2009 at 9:31 PM, TJ Hemrick <x53gunner@gmail.com> wrote:
  >
  >> David,
  >>
  >> You just couldn't do it. You just couldn't stay away. A few years ago
  >> when we exchanged emails and over the past several years of reading between
  >> the lines of posts here on the list, I sensed some dissatisfaction and
  >> occasional disgust with some unruly customers. I completely understood
  >> your
  >> sentiments. I hope things go much better now. Although, I must say,
  >> they're still out their so don't let them ruffle your feathers.
  >> Damn glad you're back.
  >> Now, about the plans for those aux fuel tanks and how to rig the
  >> pickups.... ;)
  >>
  >> Great way to start the new year,
  >>
  >> Ciao'
  >>
  >> TJ Hemrick
  >> 87 Syncro
  >> Melbourne Florida
  >>
  >> Date: Thu, 31 Dec 2009 10:07:03 -0800
  >> From: David Marshall <mailinglist@FASTFORWARD.CA>
  >> Subject: HasenWerk 2010 Grand Opening
  >>
  >> <style type=3D"text/css">
  >> ->
  >> </style>
  >> After a two year sabbatical I would like to
  >> announce that HasenWerk is now officially open for business as of January
  >> 1st 2010. Unlike my former business, Fast Forward Automotive,
  >> I have reduced my product scope and will focus mainly on engine conversio=
  >> n
  >> wiring harnesses and accessories for Volkswagen Vanagon a Suzuki Samurai
  >> vehicles. One of the new areas that I am getting into is custom chip
  >> tuning for Vanagons with TDI and 1.8T engines so that the power is
  >> &ldquo;softer&rdquo; on the gear box.
  >> Please feel free to visit http://www.hasenwerk.ca and take a
  >> look at what I have to offer and as well see photos from my various BMW G=
  >> S
  >> and Volkswagen Syncro adventures.
  >> May everyone have a happy and prosperous
  >> 2010!
  >>
  >> David Marshall
  >> VW Adventure Driver and BMW Adventure Rider
  >> =20
  >> HasenWerk=20
  >> http://www.hasenwerk.ca
  >>
  >