Fuel Injector: Service and Repair

Replacement

WARNING:
- Compressed natural gas is flammable and highly explosive. You could be killed or seriously injured if leaking natural gas is ignited.
- Stop the engine, and keep heat, sparks and flames away.

1. Relieve the fuel pressure (between the engine and manual shut-off valve).
2. Remove the fuel injector covers. Disconnect the connectors from the fuel injectors and the fuel temperature sensor.
3. Disconnect the PCV hose.
4. Remove the retainer nuts on the fuel rail.
5. Disconnect the fuel rail.




6. Remove the fuel injectors from the intake manifold.
7. Slide new cushion rings onto the fuel injectors.
8. Coat new O-rings with PAG oil, and put them on the fuel injectors.
9. Insert the fuel injectors into the fuel rail first.
10. Coat new seal rings with PAG oil, and press them into the intake manifold.




11. To prevent damage to the O-rings, install the fuel injectors in the fuel rail first, then install them in the intake manifold.
12. Install and tighten the retainer nuts.
13. Connect the PCV hose.
14. Install the connectors on the fuel injectors and the fuel temperature sensor. Install the fuel injector covers.
15. Perform the leak inspection procedure.