4Kq fueling issues

[Edward R. Wendell IV]

http://www.sjmautotechnik.com/trouble_shooting/fuelpump.htm#tank

I've made it a point not to argue with this guy. He's helped way too 
many people way to many times, myself included. Also, note that he 
references an Audi service bulletin. Take it up with them.

Roy
On Monday, November 15, 2004, at 02:57 PM, Kneale Brownson wrote:

> I've been inside 5ktq, 200tq20v and S-4 tanks (at least enough to 
> remove
> the pumps and their retainers) and never seen any sign of any kind of
> lining to the tanks.  If there is a lining, it's perfectly clear or 
> it's
> only located on the very top of the tank.  However, there IS gunk that 
> can
> form inside the tank.  I have no idea of its origin, but when I 
> replaced my
> 200q20v's tank this spring, I found some brownish stuff inside the pump
> retainer basket.  I supposed this came from the interaction of fuels 
> with
> the rust-through that made the tank leak, which was the reason for
> replacing it.  Since I had both the pump opening and the filler 
> opening to
> look through, I examined both the leaking tank and the one replacing it
> from two viewpoints and did not see any sort of lining material.
>
> At 02:20 PM 11/15/2004 -0500, Edward R. Wendell IV wrote:
>> I don't know if the 4k suffers from the same problem, but on the 5k
>> there is a coating on the inside of the tank that flakes off and plugs
>> up the intake screen on the pump. This results in lot of noise from 
>> the
>> pump and an engine that only runs for about ten minutes at a time if
>> stationary and even less if moving. The Audi recommended fix is to cut
>> off the screen and let the junk pass through the pump. It's a lot
>> easier to replace the fuel filter than open up the tank to get to the
>> pump. Apparently no amount of cleaning will stop the problem. I had
>> thought that there was a certain amount of fiction in this scenario 
>> but
>> I had a textbook case on an 89 200 about a year ago.
>>
>> If I recall correctly the 4k pump is external, but I would imagine 
>> that
>> there is still a screen on the pickup inside. I don't know if the 4k
>> tank has the same coating inside either.
>>
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>