Fuel pump issues

[Bill Green]

I sold centrifugal pumps for years. The two pumps you mention may in fact be
identical. With centrifugal pumps the higher the flow the lower the
pressure. So while the 023 pump may pump 168 l/h at 5 bars when there is
only 5 bars of resistance on the discharge side of the pump it may also pump
105 at 6,5 bars when there is sufficient resistance on the discharge side of
the pump. Check with the manufacturer to be sure.

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of Dag Bøsterud
Sent: Tuesday, May 25, 2010 3:26 PM
To: quattro at audifans.com
Subject: Fuel pump issues

Ordered a new fuel pump the other day for my 1990 Audi 100 TQ Sport
Exklusiv. The original fuel pump is the Bosch 040-pump, delivering 102 l/h @
6,5 bars (according to Bosch).

The fuel pump I got was the 023-pump, and the guy at the parts counter said
it would be a direct drop-in, and since I wasn't in a place to argue I said
"ok", paid and left.
When I got home I checked the specs of the pump, and the 023-pump delivers
168 l/h @ 5 bars. So, more fuel at less pressure.

Before I get in luggage compartment and change the fuel pump - will this
work, or will I get a car that won't start?

Any thoughts about this?

/Dag
Norway

1990 Audi 100 TQ Sport Exklusiv
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