Honda Civic. Manual — part 677

Fig. 85: Identifying Alignment Marks, Tank And Bands

5. If the tank has any problems listed in step 4, refer to the NGV Fuel Container

Inspection Guidelines booklet for further information.

FUEL TANK SCRAPPING

1. Slowly remove the manual lock-down valve. Install the manual override vent

tool in its place. Relieve the fuel pressure from the fuel tank (see FUEL
PRESSURE RELIEVING ).

2. Purge any remaining fuel from the tank with compressed air.
3. Remove the fuel tank (see FUEL TANK REMOVAL/INSTALLATION ).
4. Dispose of the fuel tank according to your local regulations.

FUEL PIPE CONNECTOR O-RING REPLACEMENT

1. Remove the old O-ring.

NOTE:

The fuel tank must be replaced 15 years after its production
date.

NOTE:

a. To prevent O-ring contamination, be sure O-rings and

mating surfaces are clean just before assembly.

b. Install O-rings with clean hands. Do not install O-rings

while wearing fibrous gloves.

c. Do not twist O-rings.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

2. Wrap vinyl tape around the threads, and coat the surface of the tape with

silicone oil or grease.

Fig. 86: Identifying Vinyl Tape

3. Install a new O-ring (A) into the groove.

Fig. 87: Identifying O-Ring

4. Using a small brush, apply silicone oil or grease to the outer surface of the O-

ring.

5. Remove the vinyl tape.

FUEL PRESSURE REGULATOR P1 REPLACEMENT

NOTE:

Wrap the vinyl tape (A) so that there is no stepped
portion.

NOTE:

Be careful not damage the sealing face of the O-ring.

WARNING:

Compressed natural gas is flammable and highly

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

1. Relieve fuel pressure between the engine and the manual shut-off valve (see

FUEL PRESSURE RELIEVING ).

2. Drain the engine coolant, refer to the COOLANT REPLACEMENT .
3. Remove the cowl cover and under-cowl panel, refer to the COWL COVER

REPLACEMENT .

4. Remove the fuel pressure regulator protector (A).

Fig. 88: Exploded View Of Fuel Pressure Regulator With Torque
Specifications

5. Remove the fuel feed hose (B), then disconnect the hoses (C) and the fuel line

(D).

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

NOTE:

Always use two wrenches when removing or installing
the fuel line nuts (see FUEL LINE INSPECTION ).

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

6. Disconnect the connectors (E), and remove the bolt (F) and the nut (G).
7. Lift the vehicle and support it with jackstands.
8. Remove exhaust pipe A, refer to the EXHAUST PIPE AND MUFFLER

REPLACEMENT .

9. Remove the heat shield (A).

Fig. 89: Identifying Heat Shield With Torque Specifications

10. Remove fuel pressure regulator P1 (A) from the bracket (B).

Fig. 90: Removing Fuel Pressure Regulator From Bracket

11. Move fuel pressure regulator P1 (A) as shown.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX