Civic L4-1.8L CNG (2008)
1. Relieve the fuel pressure between the fuel tank and the manual shut-off valve (see the previous procedure).
2. Remove the under floor cover (A).
3. Loosen the sealing bolt (A) on the fuel joint block slowly.
4. Turn the fuel stem assembly (B) 1/2-1 turn counterclockwise.
5. Replace the fuel stem assembly and sealing bolt O-ring (C).
At the fuel tank
NOTE: This procedure degrades the integrity of the fuel tank. Do it only if you are replacing the fuel tank.
1. Lift the vehicle and support it with jackstands.
2. Close the manual shut-off valve (A).
3. Start the engine, and let it idle. After a few minutes, the engine will stall.