Here is a link to a Samba thread with instructions how to make a bypass harness to test the wiring of the FI system.
I have used it a few times now and it has cut the time needed to diagnose down to minutes once you have built the harness.
Credit goes to Mark D. on this one.
Other than a DigiTool, this bypass harness is the second best diagnosis tool for the Vanagon.

http://www.thesamba.com/vw/forum/viewtopic.php?t=349429

dylan

________________________________
From: pdooley <psdooley@VERIZON.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Wednesday, June 3, 2009 10:45:33 AM
Subject: Re: Why does the fuel pump cycle twice?

You would need to understand how the fuel pump is triggered.
Could be a faulty relay, ECU or input signal to the ECU.
Or wiring.
I know that doesn't help much, maybe somebody who has experienced this and
solved it will jump in with a more concise answer soon.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jeff Lincoln
Sent: Wednesday, June 03, 2009 9:22 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Why does the fuel pump cycle twice?

Just an observation but it seems that Robert has a legitimate question and
his post has sort of been hi-jacked. I'm curious to se what others say about
his pre-start double cycling of his fuel pump.

--
Thanks,

Jeff
'90 Carat (Grover)
'86 (We call this one Parts)
'78 Bus (Melissa) Patty's Bus