Fuel pump replacement on 1985 4000S Quattro

[Ingo Rautenberg]

Yeah.  Basically the design is such that the wiring is less than  
ideal to the pump.  As the pump gets older/more tired, it draws more  
amps, which overheats the relay, which fails.  Corrosion at the fuel  
pump contacts is definitely an issue (especially in the rust belt).   
Us Urq owners have done the additional fuel pump relay under the seat  
(where  the Urq battery is), so that maximum voltage gets to the pump.

All of this doesn't mean your pump isn't on its way out, of course --  
it probably is.

Ingo

On Jul 31, 2007, at 8:26 AM, SJ wrote:

>
>> From: Ingo Rautenberg <ingo.rautenberg at gmail.com>
>> Subject: Re: Fuel pump replacement on 1985 4000S Quattro
>
>> In 5 minutes it starts and runs again for a second then dies.   
>> AND---  no
> more
>> pump hum-- complete silence.
>
> **** Check the electrical connections at the pump first. I had a  
> similar
> problem - the engine would die while driving.
>
> On my 85 4k, the electrical pump connections were just springy push- 
> on type
> of connections. These corrode and/or loosen up and  you get  
> intermittant
> operation.
> I cleaned the contacts, and the pump electrical posts. Then I put the
> electrical contacts back on AND I secured them with brass washers  
> and nuts.
> Problem was solved.
>
> SJ
>
>
>
>