- The negative battery terminal must be removed before beginning the fuel injector replacement procedure.
Locate the negative battery terminal on your vehicle (it's usually marked with a "-" sign) and loosen the bolt holding it in place using a wrench. Remove the bolt and lift off the negative battery terminal.
2. Remove the Fuel Pressure Relief Valve Cap
- Turn the key to the "ON" position (don't start the engine).
- Listen to the fuel pump until it stops running (it should only take a couple of seconds).
Turn the key to the "OFF" position.
-Locate the fuel pressure relief valve on your vehicle (it's usually located on the fuel rail near the injectors).
- Pull up the plastic cap covering the fuel pressure relief valve.
3. Relieve Fuel Pressure
- Press down the fuel pressure relief valve with a screwdriver or other suitable tool.
- A small amount of fuel will spray out - be prepared to catch it with a rag or container.
- Continue pressing the fuel pressure relief valve until no more fuel comes out. Release the valve.
4. Remove the Fuel Rail
- Locate the fuel rail bolts that hold the rail in place. On some vehicles, you also remove any electrical connectors attached to them.
- Loosen the fuel rail bolts with a wrench and remove them entirely.
- Carefully lift off the fuel rail, taking care not to spill any remaining fuel.
5. Remove the Old Injectors
- Each injector is held in place by a single bolt.
- Loosen the injector bolts with a wrench and remove the bolts entirely.
- Carefully lift out the old injectors. Note the orientation of the injectors as you remove them - the new injectors must be installed in the same orientation.
6. Install the New Injectors
- Take a new injector and insert it into the fuel rail hole.
- Screw in the injector bolt and tighten it with a wrench.
7. Reinstall the Fuel Rail
- Carefully lower the fuel rail back into position.
- Secure it with the fuel rail bolts.
8. Reconnect the Negative Battery Terminal
- Reattach the negative battery terminal to the battery post and tighten the bolt.
9. Start the Engine
- Turn the ignition to the "ON" position and then crank the engine.
- The engine may take a few seconds to start, as it needs to build up fuel pressure.
10. Check for Leaks
- Once the engine is running, inspect the area around the fuel injectors for any leaks. If you see any leaks, tighten the injector bolts until the leaks stop.
