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RE: [T3] FI fuel pump relay

> On 31 May 2005 at 21:43, I wrote:
> > My FI fuel pump relay failed a few weeks ago. It started
> > clicking a bit while I was driving, then whirred for a
> > few seconds, then went off.
> From: Jim Adney
> Sent: 01 June 2005 04:22
> The relay should just click, not whirr. If it is actually
> buzzing on you then there's something intermittent in it.
> OTOH, if you're hearing the fuel pump
> whirr when you power the relay then that's okay.

Sorry about the huge delay in following this up.
Other priorities meant the car has stood for ages.

The relay *was* buzzing. I can't recreate the fault now!

> You should check the wiring that controls the pump relay,
> especially a splice connector in the engine compartment.
> It will be right up at the front of the compartment, just
> to left of center. If that connector has been taken apart and
> then not put back together well, then this could be intermittent.

There are only 2 single wire connectors on my engine : one for
CHT (I assume - it goes down to the LH head area), and one
at the back (towards front of car) which comes out of the FI loom
and has a small white numbered wire going into it. The engine has
been out recently, but this wouldn't have been disturbed as that
part of the loom stays in the car.

Comparing the FI wiring diagram in my Bentley, our car is simpler
as we don't have the emission control stuff. And the Haynes doesn't
even have a wiring diagram of an FI car, so I don't actually have an
accurate diagram at all!

Anyway, I tested the relay on the bench and it seems fine so I have
put it back. I made a bypass switch just in case, which is also
good for priming, and incidentally, for finding fuel line leaks without
the engine running!

I've written it up with a picture here: http://vw1600e.org.uk/fi/switch/

I had to replace a fuel line so I ran the pump for a good 10 - 20 secs.
The pressure regulator started whistling. At first it seemed to be
resonating with the pump, but then the pitch rose. It got quieter and
faded out at something like 1 KHz. Wierd.

Matt. UK.
'73 1600e Fbk.

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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