Fuel Pressure Regulator Valve -N276-, CHECKING

Special tools and workshop equipment required 

• Hose Clamps - Up To 25mm 3094
• Measuring container, fuel-resistant
• Assisting hose for return connection

Procedure

-- Remove the engine cover, refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Remove the fuel return hose -2-.

Fig 1: Hose Clamps

Courtesy of AUDI OF AMERICA, LLC

-- Seal off the open return connection with an adapter hose -2- and a Hose Clamp - Up To 25mm 3094.

Fig 2: Adapter Hose & Hose Clamp

Courtesy of AUDI OF AMERICA, LLC

-- Hold the fuel return hose -1- in a measuring container.

-- Start the engine and let it idle for a one minute:

• Return quantity when starting: 0 ml.

-- Let the engine idle longer.

-- While the engine is running, empty the measuring container or switch it with an empty measuring container and start to measure.

-- Let the engine idle for 2 minutes then measure the return quantity.

• Return quantity in two minutes: 0 to 60 ml (2.02 ounces).

If the specified values are not attained:

-- Measure the fuel injector return quantity with the engine running, refer to FUEL INJECTOR RETURN QUANTITY, MEASURING WITH ENGINE RUNNING .

-- If the fuel injector return quantity is ok, then replace the Fuel Pressure Regulator Valve - N276-.

-- If the fuel injector return quantity is not ok, then replace the faulty fuel injector.

Fuel System, Bleeding and Checking for Leaks

-- Let the engine run a few minutes at idle without pressing the accelerator pedal and then stop the engine. The fuel system bleeds itself.

-- Check the entire fuel supply system for leaks.

Replace any leaking parts.

-- Perform a road test where the accelerator pedal is pressed all the way down at least one time. Then check the high pressure area again for leaks.

-- Install the engine cover, refer to ENGINE COVER, REMOVING AND INSTALLING .