Date:         Tue, 8 May 2001 17:31:22 -0400
Reply-To:     David Beierl <dbeierl@attglobal.net>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@attglobal.net>
Subject:      Re: Fuel Pressure Too High?
Comments: To: Doss88Wkndr@aol.com
In-Reply-To:  <d2.6454be2.2829b78e@aol.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 04:56 PM 5/8/2001, Brian Doss wrote:
>Having just put a new fuel pump and filter in my bus, I decided to have my
>local mechanic check the fuel pressure for me.  His gauge read 39 psi with
>the vacuum line connected and 45 psi with the vacuum line disconnected.  When
>I got home and checked my Bentley manual, it said the pressure should be 29
>psi and 36 psi respectively.  So, should I spend $50 and get a new pressure
>regulator?  What would the extra 10 psi really affect?

Means your injectors will be pushing about one-fourth more fuel than they
should -- Volume is roughly proportional to pressure x time.  The ECU will
try to shorten the injector pulses to compensate (*if* your lambda sensor
is working) but very likely that much extra is beyond its range of
compensation.

That pressure needs to be right on for things to work correctly...you have
little choice but to replace the regulator.

david


David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"