1. Diagnose the Issue
 

• First, verify that the fuel pump is the root cause of the stalling issue. Other components like the fuel filter, fuel injectors, or even the ignition system could also be at fault.
• Use an OBD-II scanner to check for any error codes that may indicate a fuel pump issue.
• Listen for a humming sound when you turn the ignition key to the “ON” position; no sound may indicate a faulty fuel pump.

 
2. Check the Fuel Filter
 

• A clogged fuel filter can reduce the flow of fuel to the engine, leading to stalling. Make sure the fuel filter is not obstructed and is in good condition.
• If it’s been a while since the fuel filter was last replaced, it might be a good idea to replace it even if it doesn't appear to be the only issue.

 
3. Inspect the Fuel Pump Relay
 

• The fuel pump relay controls the electrical supply to the fuel pump. A faulty relay can cause intermittent stalling issues.
• Replace the relay with a new one to rule out this potential problem. You can find the relay in the main fuse box under the hood.

 
4. Test Fuel Pressure
 

• Attach a fuel pressure gauge to the fuel rail to measure the fuel pressure coming from the fuel pump.
• Consult your 2014 Audi A6's service manual for the correct fuel pressure range.
• If the pressure is below the recommended level, the fuel pump may be failing and will likely need to be replaced.

 
5. Replace the Fuel Pump
 

• If the fuel pump is confirmed to be faulty, you'll need to replace it. Ensure you have a proper working environment with basic safety precautions in place.
• Disconnect the car battery to prevent any electrical accidents.
• Relieve the fuel system pressure by opening the fuel cap and then use a fuel pressure release tool if applicable.
• Access the fuel pump, usually located in the fuel tank. In many cases, you can reach it by removing the rear seat and accessing a cover plate.
• Remove the old fuel pump and install the new one, making sure all connections are secure.
• Reassemble all removed components and reconnect the battery.

 
6. Road Test
 

• After replacing the fuel pump, start the engine and let it idle for a few minutes. Ensure there are no leaks and that the engine runs smoothly.
• Take the car for a road test to verify that the stalling issue is resolved.

 
7. Consult a Professional
 

• If you're not confident in diagnosing or fixing the issue yourself, it's recommended to consult a professional mechanic.
• A certified Audi technician will have the proper tools and expertise to accurately diagnose and fix the problem.

 
Regular Maintenance
 

• Regularly check and replace the fuel filter as part of your ongoing vehicle maintenance to prevent future issues.
• Keep an eye on any warning lights on your dashboard indicating potential fuel system problems.