Description
Impact sensor for fuel cut-off for Citroën and Peugeot vehicles. Slightly damaged rubber part – fully functional. Inertial – impact switch.
This inertial fuel cut-off sensor (impact switch) is designed to interrupt power to the fuel pump in the event of a collision or violent deceleration, reducing the risk of fuel leakage and fire. It is a simple, reliable safety component commonly used on older Citroën and Peugeot models. The unit listed here corresponds to reference numbers 636654 and 1477226080 and is suitable for a range of Stellantis vehicles.
Designed For
Typical compatible models: Citroën Berlingo, Citroën Xsara, Citroën Xsara Picasso, Peugeot 306, Peugeot 406, Peugeot 607, Peugeot Partner. Always check the listed product codes against the vehicle’s parts list before ordering.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Various Citroën and Peugeot models (see compatibility list)
- Product Codes: 636654, 1477226080
- Other Numbers: N/A
Function And Symptoms
The inertia/impact switch monitors sudden deceleration and mechanically or electrically opens the fuel pump circuit when triggered. Common symptoms of a faulty or triggered unit include a no-start condition with no fuel pump noise, intermittent fuel pump operation, or a vehicle that will not restart after a minor collision or heavy jolt. If the rubber boot or connector is damaged there may be moisture ingress or poor electrical contact, causing intermittent faults.
Why The Part Fails Most Often
- Mechanical damage from impacts or improper handling.
- Age-related deterioration of the rubber boot and seals leading to moisture ingress.
- Corrosion of electrical contacts and connectors.
- Electrical faults in wiring or poor crimp/joint connections.
Installation Recommendations
- Always disconnect the battery before starting work and follow the vehicle manufacturer’s procedures to avoid accidental short circuits or damage.
- Locate the inertia switch according to the vehicle’s workshop manual (typical locations: engine bay, passenger footwell, or luggage compartment depending on model).
- Unplug the electrical connector and remove any mounting screws or clips. Note the bracket orientation for correct refit.
- Fit the replacement unit, secure mounting, reconnect the electrical plug and any retaining clips. Restore battery power and verify fuel pump operation.
- After installation, cycle ignition to prime the fuel system and confirm there are no fault codes or pump interruptions. If the vehicle has a fuel pump cut-out reset procedure, follow the manufacturer’s instructions.
- Check connector pins and wiring for corrosion or damage and repair as necessary to ensure reliable operation.
Basic Troubleshooting
- Visual inspection: Check the rubber boot, mounting, and connector for physical damage or corrosion.
- Electrical check: With appropriate safety precautions, verify continuity of the switch and condition of the wiring harness using a multimeter.
- Reset/test: Some inertia switches can be manually reset after a trigger; consult the workshop manual for the correct procedure for your model.
This replacement inertial fuel cut-off sensor is an economical safety component for mechanics and DIY enthusiasts restoring correct fuel cutoff function after impacts or when diagnosing no-start fuel pump issues. Product references 636654 and 1477226080 are included for quicker lookup and compatibility matching.
