Fuel pump failure A6 C7

Audi A6 C7 (2011-2018)

Error Codes

3-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0087

4 min read

640 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and repair fuel pump failure in an Audi A6 C7 (2011-2018) with detailed steps, tools required, and symptoms.

Error Code

P0087

Affected Component

fuel pump

Estimated Time

3-4 hours

Symptoms

•Engine cranks but does not start
•Engine stalling
•Poor acceleration
•Engine misfires
•Unusual noise from fuel tank

Diagnostic Steps

1
Connect an OBD-II scanner to the vehicle's diagnostic port
2
Check for any stored trouble codes related to the fuel system
3
Locate the Schrader valve on the fuel rail
4
Connect a fuel pressure gauge to the Schrader valve
5
Turn the ignition key to the 'ON' position without starting the engine
6
Check the fuel pressure reading
7
Use a multimeter to check the fuel pump relay and fuse in the fuse box
8
Verify the voltage at the fuel pump connector
9
Listen for a humming sound from the fuel tank area

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II Scanner
•Fuel Pressure Gauge
•Multimeter
•Basic Hand Tools
•Replacement Fuel Pump
•Socket Set
•Fuel Line Disconnect Tool
•Jack and Jack Stands

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Diagnostic Steps

1
Connect an OBD-II scanner to the vehicle's diagnostic port
2
Check for any stored trouble codes related to the fuel system
3
Locate the Schrader valve on the fuel rail
4
Connect a fuel pressure gauge to the Schrader valve
5
Turn the ignition key to the 'ON' position without starting the engine
6
Check the fuel pressure reading
7
Use a multimeter to check the fuel pump relay and fuse in the fuse box
8
Verify the voltage at the fuel pump connector
9
Listen for a humming sound from the fuel tank area

Solution

Fuel Pump Failure - Audi A6 C7 (2011-2018)

Fuel pump failure in an Audi A6 C7 can lead to various drivability issues. Below are detailed steps to diagnose and repair a faulty fuel pump.

Repair Instructions

Tools Required:

Replacement Fuel Pump
Socket Set
Fuel Line Disconnect Tool
Jack and Jack Stands

Safety Precautions:
- Disconnect the negative battery terminal to avoid electrical shorts or sparks.
- Ensure the vehicle is on a level surface and securely supported by jack stands.
Relieve Fuel System Pressure:
- Remove the fuel pump relay or fuse and start the engine. Allow it to run until it stalls to relieve pressure.
- Disconnect the fuel line at the engine bay with a fuel line disconnect tool.
Access the Fuel Pump:
- Depending on the model, the fuel pump can be accessed through the rear seat or the trunk.
- Remove the access cover by unscrewing the fasteners.
Remove the Fuel Pump:
- Disconnect the electrical connectors and fuel lines from the pump module.
- Carefully remove the retaining ring or bolts holding the pump in place.
- Gently lift the fuel pump module out of the tank, avoiding damage to the float arm.
Install New Fuel Pump:
- Compare the old pump with the new one to ensure compatibility.
- Install the new pump into the tank, ensuring the correct orientation.
- Secure it with the retaining ring or bolts.
Reassemble:
- Reconnect all electrical connectors and fuel lines.
- Replace the access cover and secure it.
Test the System:
- Reconnect the negative battery terminal.
- Turn the ignition to the "ON" position to prime the fuel system.
- Check for leaks around the fuel pump area.
- Start the engine and check for proper operation.
Final Verification:
- Ensure the vehicle runs smoothly with no hesitation or stalling.
- Recheck the fuel pressure to confirm it's within specifications.

By following these detailed steps, you should be able to diagnose and replace a faulty fuel pump in an Audi A6 C7 effectively. If issues persist, further diagnostic work may be required to identify underlying causes.