How to fix fuel pump failure Audi Q5

Fixing Fuel Pump Failure in an Audi Q5 (2008-2017)

Tools Required

• OBD-II Scanner
• Fuel pressure gauge
• Digital multimeter
• Basic hand tools (socket set, screwdrivers)
• Safety gloves and eyewear

1. OBD-II Scan

   • Connect the OBD-II scanner to the diagnostic port under the dashboard.
   • Check for any error codes related to the fuel system (e.g., P0087 - Fuel Rail/System Pressure - Too Low).

2. Fuel Pressure Test

   • Locate the fuel pressure test port on the fuel rail.
   • Attach the fuel pressure gauge.
   • Turn the ignition to the "ON" position without starting the engine.
   • Check the fuel pressure reading; it should be within the range specified in the service manual (typically around 50-60 psi for the Audi Q5).

3. Electrical Testing

   • Use a digital multimeter to check the voltage at the fuel pump connector.
   • Ensure there is power and a good ground connection when the ignition is turned on.
   • Inspect the fuel pump relay and fuse for continuity and replace if necessary.

Repair Instructions

Tools Required

• Jack and jack stands
• Fuel line disconnect tool
• New fuel pump assembly
• Torque wrench

1. Prepare the Vehicle

   • Park the vehicle on a level surface and turn off the ignition.
   • Disconnect the negative battery terminal to prevent any electrical accidents.
   • Safely lift the vehicle using a jack and support it with jack stands.

2. Drain the Fuel Tank

   • To reduce the risk of spills, ensure the fuel tank is as empty as possible.
   • Use a siphon pump if necessary to remove excess fuel.

3. Remove the Fuel Tank

   • Locate the fuel tank under the vehicle.
   • Use the fuel line disconnect tool to detach the fuel lines from the tank.
   • Disconnect the electrical connectors for the fuel pump and fuel level sensor.
   • Unbolt and carefully lower the fuel tank using a transmission jack or a similar support tool.

4. Replace the Fuel Pump

   • Once the tank is removed, clean the area around the fuel pump module to prevent dirt contamination.
   • Remove the retaining ring or bolts securing the fuel pump to the tank.
   • Carefully lift the old fuel pump assembly out of the tank.
   • Install the new fuel pump assembly, ensuring the gasket or seal is properly seated to prevent leaks.
   • Secure the pump with the retaining ring or bolts.

5. Reinstall the Fuel Tank

   • Lift the fuel tank back into position.
   • Reconnect the fuel lines and electrical connectors.
   • Bolt the tank securely in place.
   • Double-check all connections for tightness and security.

6. Test the New Fuel Pump

   • Reconnect the negative battery terminal.
   • Turn the ignition to the "ON" position to prime the system and check for leaks.
   • Start the engine and verify smooth operation and normal fuel pressure.

7. Final Checks

   • Clear any error codes using the OBD-II scanner.
   • Take the vehicle for a test drive to ensure the problem is resolved.

By following these detailed steps, you should be able to address a fuel pump failure in an Audi Q5 (2008-2017) efficiently. Always refer to the vehicle's service manual for specific torque specifications and additional guidance.