Re: ruth buzzy fuel pump

[Michael Murphy <mmurphy@nais.com>]

Chris Dyer wrote:
> I, too, have a pump buzz.  Words of confusion/wisdom from my guru
> mechanic:
> 
> He says that certain years audis' fuel tanks had a weird coating on the
> inside.  This coating chips off and gets in the pump, making it
> buzz--but the pump works fine.  So don't fix it.
> 
> THEN he said, if your car is hi-mileage, replace it, no big whoop.  BUT
> that new pump will eventually buzz soon enough.
> 
> This in re: '87 5kcsq.  So I haven't replaced mine.

Paraphrased from the AllData CD TSB's  TSB 91-07 issued 3/31/91
Fuel tank coating loosens and migrates to fuel pump inlet
screen causing hard start, rough idle, poor performance/acceleration.

Models:  
1986-88 All 5KS and 5K Turbos
1989    100/200 up to VIN 44KN017651
Fix: 
Removal of fuel pump and cutting out filter screen.
Details are long and may not cure problem. Next remedy is to replace
fuel pump (after removing wire screen).  
If anyone wants/needs details, send private email.
HTH,
MJ Murphy