Date:         Mon, 11 May 2009 21:03:30 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Digifant Fuel System Troubleshooting Experience
Comments: To: Dave Arthur <dave.arthur@nscc.ca>
In-Reply-To:  <C62E4F1D.7CB4%dave.arthur@nscc.ca>
Content-Type: text/plain; charset=ISO-8859-1

On Mon, May 11, 2009 at 5:54 PM, Dave Arthur <dave.arthur@nscc.ca> wrote:


>
> I replaced the relay and connected the pump up properly and all was well,
> until I checked the fuel pressure. As soon as the pump stopped the fuel
> pressure bled down rapidly to zero (~2-3 sec). The manual expects at least
> 29 psi after ten minutes!
>
> I pinched off the fuel return line and individual injectors to test for leak
> down issues and concluded that the pump itself was not holding the pressure
> when it stopped.
>
> So the engine runs, but starts hard, with the pump running all the time as
> before, the engine started immediately.
>


Did you check the fuel regulator?

If it had a faulty diaphragm, fuel might leak past into vacuum line
causing the pressure drop.

Of course having fuel leaking past it into the vacuum line is not a
good thing either!  :)

Neil.


--
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines