Date:         Mon, 27 Nov 2000 19:04:39 -0800
Reply-To:     David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject:      Re: buzzing fuel pump - additional info
Comments: To: Larry Hamm <ldhamm@xmission.com>
In-Reply-To:  <3A22A64D.D167A598@xmission.com>
Content-Type: text/plain; charset="us-ascii"

The fuel pump doesn't regulate the fuel pressure - the fuel pressure
regulator does.  The Vanagons fuel pressure regulator will keep everything
in check.  Most Bosch pumps can do 125 PSI if you let them!  I have used
Vanagon pumps to drive CIS-Motronic engines which needs up to 80 PSI to
operate - way more than the Digijet / Digifant 1 system needs.  Rabbit fuel
injection systems lower the system pressure to about 25 PSI when the engine
is stone cold and the fuel pressure regulator builds pressure up to about 65
to 70 PSI depending on what the fuel distributor is set to.


David Marshall

Fast Forward Autobahn Sport Tuning
4356 Quesnel Hixon Road
Quesnel BC Canada  V2J 6Z3
mailto:info@fastforward.ca      http://www.fastforward.ca
Phone: (250) 992 7775           FAX: (250) 992 1160

. Vanagon Accessories and Engine Conversions
. Transporter, Unimog and Iltis Sales
. European Lighting for most Audi and Volkswagen models


-----Original Message-----
From: Larry Hamm [mailto:ldhamm@xmission.com]
Sent: November 27, 2000 10:22 AM
To: David Marshall
Cc: vanagon@GERRY.VANAGON.COM
Subject: Re: buzzing fuel pump - additional info


David Marshall wrote:
> I have successfully used VW Rabbit (Fuel Injected) fuel pumps on
> Vanagons with no problems which should be common and cheap as pocket lint
at
> the local wrecking yard.  The only "issue" with the Rabbit fuel pump is
> there is not a clamp on fitting on the high pressure end like the Vanagon
> pump has - instead it is a metal "banjo" fitting.

David,
That may work for a while, but the Jetta/Golf pumps put out twice the
pressure than the WBX pump. Was the Rabbit FI using lower pressure? If
not, I expect problems may occur with either the pump or the pressure
regulator.
When I switched my Westy from Jetta power to Subaru, the pump howled
like a banshee, so I had to install a WBX pump to match the pressure
requirements.
Larry
PS-Received the OME's today, thanks!