'90 200 tqa fuel pump

[Dave Fain]

I had a pump on a 90Q20V fail so that the motor ran but it wasn't turning
the pump.  I had a heck of a time diagnosing that one.
Dave

Date: Mon, 19 Dec 2011 08:52:13 -0500
From: "Nick Lawrence" <nick at beol.net>
To: <quattro at audifans.com>
Subject: '90 200 tqa fuel pump
Message-ID: <C784F9918D1E4BA5A9C39BC0B0CEA432 at D7Z0ZR61>
Content-Type: text/plain;       charset="iso-8859-1"

I want to confirm my diagnosis on the fuel pump.
My '90 200tqa suddenly stopped ruunning on the freeway Sunday. I did what
checks I could,  still had spark and didn't find any hoses blown off.   I
swapped in my spare Fuel Pump Relay and also tried the by-pass jumper I
carry. Could not hear any fuel pump activity at the tank with the access
cover off.
So had the car towed home.  (Many thanks to fellow lister Dave C.)
At home I externally plugged in,  to my car harness,  an armload of fuel
pumps from my collection. I got some activity out of them, a buzz, squeal,
or a motor sound. I suspect there are some faulty pumps in that lot.
I hooked the my battery charger straight to the fuel pump still in the car
and could hear a buzz. It did not sound like any working fuel pump I've
heard.
My questions then,    Is lock-up or sieze one of the failure modes on these
pumps?
                               Are there known culprits for not getting
full power to the pump?

TIA
Nick (central Ohio)