how to check the fuel pump in BMW 5 Series G30/G31 (2017-2024) if it’s not starting

BMW 5 Series G30/G31 (2017-2024)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

575 words

Problem Statement

The BMW 5 Series G30/G31 (2017-2024) is not starting, potentially indicating an issue with the fuel pump.

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before working on the fuel system.

Symptoms

•Engine cranks but does not start
•No sound from the fuel pump when the ignition is turned on
•Check engine light illuminated
•Fuel gauge reading lower than expected
•Fuel odor near the vehicle if there's a leak

Diagnostic Steps

1
Check for Error Codes**: Use an OBD-II scanner to read any stored trouble codes related to the fuel system.
2
Listen for Fuel Pump Operation**: Turn the ignition key to the "ON" position (without cranking) and listen for a brief whirring sound from the fuel tank.
3
Check Fuel Pump Relay**: Inspect the fuel pump relay for proper operation by swapping it with a similar relay or testing with a multimeter.
4
Measure Fuel Pressure**: Use a fuel pressure gauge to check that the fuel pressure meets the specifications for the engine.
5
Inspect Wiring and Connections**: Visually inspect the wiring harness and connectors leading to the fuel pump for any signs of damage or corrosion.
6
Check Fuel Filter**: Confirm that the fuel filter is not clogged, as this can restrict fuel flow to the engine.

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
•Multimeter
•Fuel pressure gauge
•Basic hand tools (socket set, screwdrivers)

Parts Required

•Fuel pump (if defective)
•Fuel filter (if clogged)

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Diagnostic Steps

1
Check for Error Codes**: Use an OBD-II scanner to read any stored trouble codes related to the fuel system.
2
Listen for Fuel Pump Operation**: Turn the ignition key to the "ON" position (without cranking) and listen for a brief whirring sound from the fuel tank.
3
Check Fuel Pump Relay**: Inspect the fuel pump relay for proper operation by swapping it with a similar relay or testing with a multimeter.
4
Measure Fuel Pressure**: Use a fuel pressure gauge to check that the fuel pressure meets the specifications for the engine.
5
Inspect Wiring and Connections**: Visually inspect the wiring harness and connectors leading to the fuel pump for any signs of damage or corrosion.
6
Check Fuel Filter**: Confirm that the fuel filter is not clogged, as this can restrict fuel flow to the engine.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, fuel pressure gauge, basic hand tools, safety goggles.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Access the Fuel Pump

Sub-steps:
1. Remove the rear seat or access panel to reach the fuel pump module.
2. Disconnect any electrical connectors carefully.
3. Relieve fuel system pressure by loosening the fuel filler cap and using a fuel pressure gauge to drain any remaining pressure.

3. Remove the Fuel Pump

Sub-steps:
1. Unscrew the fuel pump locking ring using a special tool or a hammer and chisel (ensure to protect surrounding areas).
2. Carefully lift the fuel pump assembly from the tank.
3. Disconnect the fuel lines and electrical connectors from the pump.

4. Test the Fuel Pump

Sub-steps:
1. Connect the fuel pump to a 12V power source to verify if it operates; listen for a whirring sound.
2. If the pump does not operate, replace it with a new unit.
3. If it operates, inspect the fuel pump filter and clean or replace as necessary.

5. Reassemble and Test

Sub-steps:
1. Reconnect the fuel lines and electrical connectors to the fuel pump.
2. Install the fuel pump assembly back into the tank and secure with the locking ring.
3. Reconnect the negative battery terminal and start the vehicle to confirm proper operation.