Fuel leak from supply fuel line in an 1999 Audi A6 during very cold weather. When temperatures drop below 15-20 F the crimped end of the fuel supply line leaks fuel, which creates an intense fuel smell in the cabin, but only if not moving at high speeds. The fuel leaking from the hose travels towards the back of the engine and eventually drips onto the exhaust manifold creating intense smoke. Apparently the cold line intensified by super cooled gas streaming through it causes the metal part of the line to contract at a sufficient rate as to allow fuel to leak out. When the fule line warms up, the leaking stops. Dealer could not replicate the problem because the ambient temperature was 40F at the time of testing and hence refused to aknowledge the problem. Subsequently the problem re-occured and I took several close-up pictures showing the leak and the ambient temperature. I can make the pictures available upon request. This is very dangerous condition that can go undetected at high speeds (high airflow dissipitates the smell) and/or if cabin air gets recirculated.

- Jersey City, NM, USA