Loosening and tightening union nut for fuel supply line in vehicles as of 07.03

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Unscrewing/Screwing Fuel Hose From Connection On Fuel Rail Pipe

Courtesy of VOLKSWAGEN UNITED STATES, INC.

WARNING:

Fuel system is under pressure! Before opening system, place rags around the connection. Then release pressure by carefully loosening connection.

Loosening:

Unscrew fuel hose from connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and unscrew union nut -2-.