Re: ‘91 coupe loses fuel overnight

[Kent McLean]

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.

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