Auto >> AutoSPT >  >> Engine

How do you access and replace the fuel sensor in a Volvo 1990 740 GL?

To access and replace the fuel sensor in a Volvo 1990 740 GL, follow these steps:

1. Disconnect the Negative Battery Terminal

Disconnect the negative battery terminal to ensure the car is completely turned off and prevent any accidental electric shocks.

2. Locate the Fuel Tank Sender Unit

Underneath the rear seat, you'll find a panel that can be removed. Once the panel is out, you'll be able to see the fuel tank sender unit.

3. Disconnect Hoses and Remove the Holder

Disconnect the fuel lines and electrical connectors attached to the fuel sender unit. Then, unbolt and remove the holder securing the fuel sender unit to the fuel tank.

4. Remove the Fuel Sender Unit

Take out the fuel sender unit from the fuel tank. You might need to gently twist or pull it to release it from the rubber gasket seal.

5. Replace the Fuel Sensor

Check the old fuel sender unit for any damage or deterioration. If you notice defects or improper sensor readings, replace it with a new fuel sender unit.

6. Reinstall the Fuel Sender Unit

Put the new or repaired fuel sender unit into the fuel tank. Ensure that the rubber gasket is properly seated and the unit fits securely.

7. Reconnect Hoses and Holder

Reattach the fuel lines and electrical connectors you disconnected earlier. Then, reinstall the holder and secure it with bolts.

8. Reconnect Battery terminal

Reconnect the negative battery terminal to the car's electrical system.

9. Test the Fuel Gauge

Turn on the ignition and check if the fuel gauge is displaying accurate readings. Take the car for a short drive to ensure proper fuel level indication.

Important Notes

- Before starting work, make sure to engage the parking brake and allow the engine to cool down completely to avoid burns.

- If you're not comfortable working with fuel system components, it's best to have the fuel sensor replaced by a professional mechanic.