Re: [20v] ‘91 coupe loses fuel overnight

[theringmeister]

If theres no evidence of a leak, how are you noting fuel loss.... assuming by the cluster gauge? 
How much of a drop are you noting in, say, 12 hours? 
I'd take what Kent suggested and start there because most other places will leave evidence (crimped rubber line at the filter, injector o-rings, etc), but I wouldn't rule out flaky readings from your fuel level sender or gauge in the dash at this point in the game either if the difference is marginal.



Sent from my Sprint Samsung Galaxy S8.
-------- Original message --------From: Kent McLean <kentmclean at comcast.net> Date: 12/11/18  7:02 AM  (GMT-05:00) To: Christopher Gharibo <cgharibo at usa.net> Cc: 20V List <20v at lists.20v.org>, quattro at audifans.com Subject: Re: [20v] ‘91 coupe loses fuel overnight 
Christopher Gharibo wrote:
> My ‘91 coupe loses fuel when left overnight. There is no evidence of a leak.
> Any thoughts on how I could be losing fuel? Evaporation?

You’re not looking in the right places.  The fuel lines running under the car are secured every few feet with a clamp. Moisture, and salt if you live where it snows, gets in there and wears away the fuel line. Eventually a pinhole leak appears.  Check the fuel line from the tank to the engine, and pay special attention to where the line is secured.  Those clamps are your most likely culprit. 

You next question will be, “How do I fix it?”  Cut out the bad line and replace with new. You can use flares for the joints, you could splice them with a short piece of rubber (double clamped with fuel-injection line clamps, not just a worm clamp), or you might run a fuel-injection rubber line the whole way.

-
Kent McLean
lots of ex-Audis, now a ’06 Grand Cherokee, a V8 Quattro wagon that works for me

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