Changing Fuel Filter On Audi A4: Step-By-Step Guide

The fuel filter on an Audi A4 B8, produced from 2008 onwards, is located in the fuel tank. However, there is some discrepancy in the sources as to whether the fuel tank needs to be dropped to access the fuel filter. One source suggests that the fuel filter can be accessed from the trunk, while another source mentions that it is located under the plastic covers under the car, below where the driver's feet would be. It is important to note that diesel and gasoline engines may have different fuel filter locations, and that there is a specific process to bleed air from the system after replacing the fuel filter.

The fuel filter is located under the driver's seat

The fuel filter on an Audi A4 B8 is located under the rear passenger seat. To access it, you will need to remove the plastic shield underneath the car. Once you have located the fuel filter, you can replace it.

It is important to note that the clips holding the fuel lines in place are fragile and can be annoying to work with. Therefore, it is recommended to proceed with caution when removing and replacing the fuel filter.

Additionally, some sources suggest that the fuel filter is located inside the fuel tank. However, this information may be outdated or inaccurate, as other users have reported that they could not find the fuel filter in this location.

For your safety, it is always recommended to consult a specialist workshop or refer to the owner's manual for guidance on replacing the fuel filter if you are unsure about any steps or procedures.

You may need to remove plastic covers to access it

To change the fuel filter on an Audi A4 B8, you will first need to locate it. The fuel filter is located in the fuel tank. However, there are conflicting sources that state that the fuel filter is underneath the passenger-side rear of the car.

If the fuel filter is located underneath the car, you will need to remove the plastic shield to access it. This will involve removing the clips that hold the fuel lines in place. Be careful when handling these clips, as they are fragile and can be difficult to work with.

Once you have located the fuel filter and removed any plastic covers or shields that are in the way, you can proceed with the fuel filter replacement.

The fuel filter is inside the fuel tank

The fuel filter on an Audi A4 B8 2.0 TFSI Quattro is located inside the fuel tank. To replace the fuel filter, you will need to determine if there is a service port or if the fuel tank needs to be dropped.

One source suggests that the fuel filter can be accessed from the trunk by removing the felt trunk bottom to expose the metal, where there appears to be a hatch. However, another source mentions that the fuel tank may need to be dropped to access the fuel filter.

It is recommended to let a specialist workshop change the fuel filter due to safety concerns with unsealing and resealing the fuel tank.

For diesel variants of the Audi A4, the fuel filter is located in front of the fuel tank, on the left side of the car.

You may need to remove the fuel tank to access the filter

To access the fuel filter on an Audi A4, you may need to remove the fuel tank. This is because the fuel filter is located inside the fuel tank on some models, and even if it isn't, removing the fuel tank can provide better access and make the job easier.

• Ensure the ignition is switched off and open the fuel tank cover briefly, then close it.
• If necessary, drain the fuel tank using a fuel cart. It is important to empty the fuel tank before removing it to avoid injury, damage, or fuel spillage.
• Remove the rear axle and the connector flange cover under the luggage compartment trim.
• Unlatch and disconnect the 4-pin harness connector. The return line and supply line will remain connected.
• Clean the area around the fuel filler neck.
• With the fuel filler cap removed, pry out the clamp ring on the rubber seal around the filler neck.
• Push the rubber seal through and towards the inside.
• Remove the right rear wheel house liner and the screw for the fuel filler neck, the ground connection, and the protective plate under the wheel house shell.
• Place clean cloths around the connections to catch any spilled fuel. Carefully loosen the connections to relieve pressure.
• From the bottom of the vehicle, mark the supply line, return line, and bleed line to the EVAP canister, then disconnect them.
• Remove the EVAP canister cover near the bottom of the spare wheel well.
• Loosen the hose connections on the bleed lines and unclip the line from the bracket.
• Place a jack under the fuel tank for support.
• Disconnect the clamp bands and carrier plate.
• Lower the fuel tank. Ensure that the bleed line stays clipped to the fuel tank during removal.

Once the fuel tank is removed, you can access the fuel filter for replacement. It is important to exercise caution when working with fuel and ensure proper ventilation to avoid inhaling fumes.

You may need to use a syringe to fill the new filter with fuel

When replacing the fuel filter on your Audi A4 2009, you may need to use a syringe to fill the new filter with fuel. This is important because running the engine without sufficient fuel can damage the fuel pump.

• Purchase a syringe that is large enough to fill the fuel filter. You can find automotive syringes at most auto parts stores or online.
• Locate the fuel filter. For the Audi A4 2009, it is typically located under the driver's side of the car, below the driver's feet. You will need to remove the plastic covers under the car to access it.
• Remove the old fuel filter. Be sure to place a container underneath to catch any fuel that may spill.
• Use the syringe to draw out fuel from the old fuel filter. You can do this by inserting the syringe needle into the fuel filter and pulling the plunger.
• Once you have drawn out enough fuel, remove the syringe and attach the caps that came with your new fuel filter to the old one to prevent any remaining fuel from leaking out.
• Install the new fuel filter. Make sure to follow the manufacturer's instructions for proper installation.
• Use the syringe to fill the new fuel filter with the fuel you drew out earlier. Insert the needle into the new fuel filter and slowly push the plunger to inject the fuel.
• Once the new fuel filter is filled, remove the syringe and secure it in place according to the manufacturer's instructions.
• Reconnect the fuel lines and any other components that were removed during the process.
• Start the engine and let it run for a few minutes. This will help to prime the fuel system and ensure that there are no leaks.

It is important to exercise caution when working with fuel and to wear appropriate safety gear, including gloves and eye protection. If you are uncomfortable performing this task yourself, it is recommended to seek the assistance of a qualified mechanic.

Frequently asked questions