Audi Workshop Service and Repair Manuals

Checking for leaks

Special tools and workshop equipment required

t	Hose clamps for hoses up to 25 mm Ø -3094-

t	Cooling system tester -V.A.G 1274- with -V.A.G 1274/2 A-

t	Adapter -V.A.G 1318/17-1- from adapter set -V.A.G 1318/17- (2 x)

t	Tandem pump tester -VAS 5187-

t	Audi A2 engine cover protector -VAS 6011-

A leaking fuel system can cause: t  Air bubbles in fuel supply pipe t  Lack of power, misfiring t  Starting problems

Test sequence –  Wash outer side of bonnet and dry with chamois leather. –  Release service flap from inside the vehicle. –  Release bonnet -arrows- and pull it forwards slightly.

–  Attach Audi A2 engine cover protector -VAS 6011- to bonnet.   Note

Do not store bonnet in upright position. –  Remove bonnet and put aside with the protective cover facing downwards.

–  Disengage hose -1- from retainer. –  Take off engine cover panel -arrows-.   WARNING t  In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the lines - danger of scalding. t  Wear protective gloves. t  Wear safety goggles.

–  Remove screw plug -arrow-.

–  Attach adapter -V.A.G 1274/2 A- to cooling system tester -V.A.G 1274-. –  Connect adapter -V.A.G 1274/2 A- to tandem pump using banjo bolt from -VAS 5187-.

–  Fold down the rear seat bench or remove the rear seat bench → Rep. Gr.72. –  Fold back lining under rear set. –  Turn cover for fuel gauge sender in -direction of arrow- and detach cover.

–  Unplug electrical connector -arrow- at flange.

–  Mark fuel supply pipe -1- and fuel return pipe -2-.   WARNING t  In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the lines - danger of scalding. t  Wear protective gloves. t  Wear safety goggles. –  Detach both pipes from flange (press release tabs).

–  Connect one adapter -V.A.G 1318/17-1- onto supply pipe and one onto return pipe. –  Clamp off adapter hoses using hose clamps -3094-.   Note The hose clamps -3094- must not be applied directly to the fuel lines themselves as this can cause damage.

–  Use cooling system tester -V.A.G 1274- to create a pressure of between 1.0 ... 1.5 bar. –  If pressure drops constantly, locate leak and eliminate fault.   Note After removing pressure gauge, tighten plug to 25 Nm. Always renew seal.