Your are right Dennis... strange, i have a 2.1L in the shop without ECU,
and that pump did buzz...
But by the book, your are right! i did double check.

Sorry about that.

Ben

Dennis Haynes wrote:

>Take another look. Pin 3 on the ECU operates the fuel pump relay by
>completing the chassis ground. Pin #1 takes a signal from the start
>circuit and the ECU should also operate the fuel pump while the engine is
>cranking. On automatics, this signal is before the neutral safety switch
>so the fuel pump while run when the key is turned to start even if the
>selector in not in neutral or park. Yes, the pump will run without the
>engine actually cranking over.
>
>The pump not turning on when the ignition is switched on is not always a
>failure. It is an ignition pulse that operates it for the short time. The
>pump must run while cranking though. After start, it is the ignition
>pulses that keep the pump on to keep the engine running. Note that power
>for the pump is also the feed for the injectors. A bad hall sensor or coil
>can keep the pump from running along with no spark.
>
>Dennis
>
>-----Original Message-----
>From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
>Benny boy
>Sent: Monday, July 23, 2007 7:26 PM
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Is ECU involved in getting power to fuel pump when turning
>ignition switch on?
>
>No
>
>http://www.loam.org/vw/Vanagon/VanagonProTraining/DigiFant/
>(page 42-43)
>
>I hope the ignition switch was check/replace!
>
>Ben
>
>
>
>On Mon, 23 Jul 2007 14:45:52 -0700, most david <dmost@YAHOO.COM> wrote:
>
>
>
>>It's been one month, and I've made no real progress in solving my
>>
>>
>"intermittent power at fuel pump when turning key on" problem in my '87.
>
>At least one person has suggested the ECU (I've ruled out fuel pump relay
>and ignition switch).
>
>For those of you who are good at reading the circuit diagrams in the
>Bentley, can anyone tell me with certainty if the ECU is involved in
>getting
>power to the fuel pump when the key is turned to the on (not start)
>position?
>
>Since I can't use the vanagon now due to not being able to count on it
>starting, I appreciate any help that anyone can offer.
>
>Thanks,
>David
>
>
>
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