Fuel Pressure Regulator Valve -N276-, CHECKING: Procedure

WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Danger of malfunction caused by dirt.

Observe. Refer to appropriate service information.

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

NOTE:

Fuel temperature greater than 15° degrees.

-- Remove the fuel return hose -2-.

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NOTE:

Ignore items -1 and 3-.

-- Seal off the open return connection with an adapter hose -2- and a :3094 .

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-- 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 oz).

NOTE:

If the specified values are attained, then the Fuel Pressure Regulator Valve -N276- is functioning properly.

If Specified Values Are Not Attained

NOTE:

The Fuel Pressure Regulator Valve -N276- and the fuel injectors were checked with the previous measurements.

To find out which component is faulty, the fuel injector return quantity must be measured.

-- Measure the fuel injector return quantity with the engine running. Refer to FUEL INJECTORS, CHECKING RETURN QUANTITY 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.