Audi Workshop Service and Repair Manuals

A leaking fuel system can cause:

• ◆ Foam build up or air bubbles in the supply pipe
• ◆ Lack of power, misfiring
• ◆ Starting problems

• ‒ Attach adapter 1274/2 A to cooling system tester 1274.

• ‒ → Unscrew return pipe from injection pump and connect adapter hose in its place.
• ‒ Attach hose clamps 3093 or 3094 at the following points:
• ‒ Feed line behind fuel filter
• ‒ On return hose downstream of fuel filter
• ‒ On return hose to injection pump

• ‒ Use hand pump on tester to create a pressure of between 1.0 and 1.5 bar.
• ‒ If the pressure constantly drops, locate leak and eliminate fault.

Note:

The fuel hoses can also be tested by moving the hose clamps from the filter to the fuel tank connections.