[V8] Excessive Oil and Emission Pressure

[ville.hiivola at suomi24.fi]

Well, i think i found out the problem. Few days ago my car wouldn't 
start and i found out fuel pump wasn't working, so i replaced it. Well 
the whine didn't go with that. But then i noticed that the 
"breathing/venting valve" was making the sound. It's the one connected 
to the line going to the tank cover. I took that valve out and tested 
it with vacuum pump. I was able to make the valve do the "whine" by 
aplying vacuum in one direction and restring it a bit. I'm not quite 
sure if this valve is basicly a check valve, or what it's purpose is.. 
But it was flowing in both directions, so i suspect it wasn't working 
correctly. Anyways i had one check valve handy so i replaced it with 
that and now the whine seems to be gone..
I hope this helps.

Ville

>----Alkuperäinen viesti----
>Lähettäjä: toml99 at todomundo.com
>Päivämäärä: 23.09.2009 19:31
>Vastaanottaja: "v8audi"<v8 at audifans.com>
>Aihe: [V8]    Excessive Oil and Emission Pressure
>
>Well, Ville, I read your idea about the gas cap and I went out and  
>switched caps and I didn't hear the noise!  I got excited and 
started  
>to write a reply, then figured I'd better actually warm the car up  
>and drive it around.....Heard the noise again within a few  
>blocks......so it's not the cap in my situation.  Mine's coming 
from  
>under the fuel pump plate and I'm confident that it's either the  
>pump, or maybe just the check valve like the my old saab.  The saab 
I  
>rebuilt for my girlfriend's daughter also made the same noise, and 
it  
>came with a spare fuel pump.  When I went to replace it, I noticed  
>the "prepump" harness(2 pumps) was disconnected....plugged it in 
and  
>noise went away.
>I noticed in the manual that there's also something called a 
"Venting  
>and breather valve"....and a Gravity valve....hmmmm venting and  
>breather valve...that sounds like something that could make my  
>noise.  Book shows it on top of tank,inside of a larger "support  
>hose".  Anybody seen this valve before?  By the diagram, it looks  
>like 1 more thing to be passed on to the new owner, but since a few  
>of you have the same noise, it would be nice to figure out if it's   
>not a $150 fuel pump...Tom
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