4kcsq Fuel Filter Frustration Gone! (sort of)

[Nate Stuart]

They may be different (I don't know first hand), but they don't have to
be. The fuel pump isn't what determines the fuel pressure. Thats done by
the fuel pressure regulator (go figure ;). Yes the two systems (EFI vs
CIS) require very different fuel pressures, but the CIS pump is certainly
capable of handling either (I run an EFI system in my 90tq with the old
CIS pump)

I would think the chassis/fuel tank change would be more of a factor, as
well as cost, since a cheaper pump may be able to be used for the lower
pressure requirements of EFI.

-Nate
'89 90tq
www.newtsplace.com/90tq

Marc Sims said:
> Re below;-
>
> I would suspect that on the more modern 80, 90, 100s the pump would be
> slightly different due to the ECU controlled fuel valves.  Wouldn't the
> pressures etc have to be different to a plate flow controlled system.
>
> I'd be interested to know for sure though cause my 93 80q is totally ECU
> managed.
>
> Marc
>
>>
>>Hi,
>>The same pump was used on many other cars ... including all fwd 4000's,
>>CGT's and 4kq, probably 80/90 as well... but the newer model Audi's
>> (80/90)
>>aren't as likely to be found at the U-pull yards.  I would look for a car
>>that has an obviously replaced pump on it... easy to ID because it will
>>look new compared to the ones that have been living under the car for
>>fifteen years.  I would not hesitate to install a newer used pump.  I
>> would
>>not bother with a fifteen year old used one, because you already have one
>>of those.  Just be prepared that when you pull the pump you have a way to
>>plug the gas line.  Otherwise the entire gas tank will drain onto the
>>ground and create a dangerous situation.
>>
>>Dave C.
>
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