Another Fuel Pump Humming

[edwulf]

About the fuel pumps...

I just changed ours ('89 100 non) yesterday.  Did it on the spur of the
moment, tired of the hum.  Went to a favorite import parts house here in
Louisville, KY (Victory Imports) and got a rebuilt unit for $140, by Python
injection.  $45 core.  Car now runs and sounds like a different animal,
altogether.  Checked the price of new ($312) and thought, no thanks.  There
are other pumps, Pierburg for example, that could be put in place of the
Bosch pump, but require a modified mounting setup, I think.  Anyhow, not a
monster of a job to do, be careful of sparks though!

FYI, the Python Injection part number was 712-312.  Inside the box was a
rebuilt Bosch 'A' unit, with screen.  Our car was one of which the factory
TSB advised cutting out the intake screen.  I did this, carefully.  Have run
the car pretty hard, about 75 city miles in two days, no problems yet.

Hope this helps someone.

Cheers to All,

Eric Wulf
'89 100
----- Original Message -----
From: "Michael A. Carr" <m_wdsllc at bigplanet.com>
To: <quattro at audifans.com>
Sent: Friday, April 13, 2001 11:06 AM
Subject: Another Fuel Pump Humming


> Hey People,
>
> My Fuel pump has been hummin for quite a while, ( 85 5000cs stick, non
Turbo non Quattro ) I just checked with the local Audi dealer, as an excuse
really to see the girl at the parts desk ( she's got
> a boy friend tho :-(, but she is really engaging none the less, so it's
nice to see her now & then ).........ANYway they wanted $$$360 sumthin, BUT
they said something VERY interesting that made me
> wonder what our bunch knows about this aspect (if it is a viable aspect)
>
> Wut they said is you can buy the check vavle for the pump seperately; but
you can't buy the pump w/o the check valve, reason "by the time the pump
goes, it's definately time to change the check
> valve"
>
> You can tell where I'm going with this right?
>
> Does anyone KNOW whether the dreaded humm is caused by the pump, or is
there a misers chance that the check valve might be the cause, at least in
some instances? And ofcourse how to go about
> verifying .....Any BTDT's on this would be appreciated.
>
> Michael
>