Re. [s-cars] Fuel Pump Relay

[Trevor Frank]

I remember Ned mentioning that the Fuel pump will not turn on unless the
motor spins faster than 200rpm, I think it a safety feature.  Car
crashes, motor stops, fuel pump also stops.  I suspect the relay is
connected through the crank position sensor.  This I believe means it is
going though the ecu wiring but may be a transparent event to the
VAG-COM and basic engine control. The last sentence is pure speculation
on my part.

One easy way to see if the fuel pump is ok, is to hot wire it, fuel
position 17, from the leg closest to the driver to power and go listen
in the trunk.

-----Original Message-----
From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
Sent: Monday, May 19, 2003 10:13 AM
To: Miikka Salonen; Brent Henry; overjump at yahoo.com
Cc: s-car-list at audifans.com
Subject: RE: Re. [s-cars] Fuel Pump Relay


Miika,


Although the ECU is connected to the fuel pump relay, it can't know if
it's still working or not, at least not on the UrS cars.

HTH,

Mihnea



>From: Miikka Salonen [mailto:miikka.salonen at kolumbus.fi]
>Sent: Saturday, May 17, 2003 7:16 AM
>To: Brent Henry; overjump at yahoo.com
>Cc: s-car-list at audifans.com
>Subject: RE: Re. [s-cars] Fuel Pump Relay
>
>
> >el Pump.  I have talked to some 20+ year Master Audi Mechanics and
>they say
> >that the Fuel Pump Relay almost never fails... its almost always the
>fuel pump.
>
>In my case both have been failed. Last summer fuel pump failed. After
>left alone for few days, it worked again for 10 to 15 minutes and
>started to make lot of noise before failing again. I think this is
>normally the case.
>
>My FPR failure was occasional engine stopping and relay clicking very
>rapidly when trying to start again. (Btw. ECU is somehow connected to
>FPR so ECU should be dead for VAG-COM if FPR fails, I think)
>
>-Miikka-
>
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