Solenoid Valve

SOLENOID VALVE

Special Tool(s):

SPECIAL TOOL(S)

REMOVAL

WARNING:
- The fuel system will remain pressurized after engine shutdown. This pressure must be relieved before servicing the fuel system. The fuel tanks must be vented prior to removal of the solenoid valves or possible personal injury or property damage can result.
- Eye protection is required when removing or installing fuel system components to avoid possible injury.

CAUTION:
- Once the solenoid valve has been opened by the use of the override tool (Manual Override Tool 134-00050, part of NGV Pressure and Venting Kit 134-00114 or equivalent), a new solenoid valve must be installed as use of the override tool will destroy the solenoid valve.
- Use hand tools only when working with the solenoid valves as power tools will destroy the low clearance tolerances on the solenoid valve threads and cause possible fuel leakage.

1. Pressure Relief-Fuel System.
2. Remove the fuel tank rack assembly being serviced.







3. Disconnect the electrical connections from the fuel tank assemblies (upper tank rack shown).
1 Disconnect the fuel temperature sensor electrical connector.
2 Disconnect the fuel pressure sensor electrical connector.







4. CAUTION: When removing the fuel tank solenoid valve electrical connector, it is possible for the connector pins to disengage from the solenoid valve.

Remove the fuel tank solenoid valve electrical connector.
1 Remove the screws.
2 Remove the fuel tank solenoid valve electrical connector.







5. NOTE: The fuel vent tube fittings (upper fuel tank rack assembly only) are left-hand thread.

Remove the fuel tube connections (upper fuel tank rack assembly shown).
1 Remove the fuel tube fittings.
2 Remove the fuel vent tube fittings (upper fuel tank rack assembly only).







6. NOTE: The fuel tank positional fittings are left-hand thread.

Remove the solenoid sensors and the positional fittings (upper fuel tank rack shown).
1 Using a backup wrench, remove the solenoid fuel tank pressure and temperature sensors.
2 Remove the positional "elbow" and "T" fittings from the solenoid valve as necessary.







7. Slowly remove the fuel tank solenoid valve and allow any residual pressure to vent. Remove the solenoid valve from the tank.

INSTALLATION







1. NOTE:
- Install a new fuel tank solenoid O-ring seal.
- Use only natural gas approved O-ring seals. These O-ring seals are identified with a yellow stripe.
- Make sure all O-ring sealing surfaces are clean.
- Thoroughly inspect and clean fuel tank solenoid valve threads. If any resistance is felt when installing the solenoid valve, remove and reinspect and clean the solenoid valve threads.
- Lubricate the fuel tank solenoid O-ring seal with clean engine oil prior to installation to help seal and ease the installation.

Install the fuel solenoid valve.







2. WARNING: The maximum gap between the solenoid valve and the fuel tank sealing surface must not be exceeded. If the gap is exceeded, fuel leakage can occur resulting in a flammable mixture, which could ignite and cause personal injury.

Check the gap between the solenoid valve and the tank-sealing surface (in the center portion of each hexagonal flat) with a feeler gauge. The gap must not exceed 0.05 mm (0.002 inch). The feeler gauge must be inserted to a depth of 1.6 to 3.1 mm (0.06 to 0.12 inch) to make sure the measurement is accurate. If the gap exceeds the allowable limit, remove the valve, inspect the sealing surfaces, lubricate and install a new seal and repeat the tightening and inspection procedure.







3. NOTE: If necessary, loosen the tank straps to slightly turn the fuel tank(s) to align the fittings with the fuel tubes.

Install the fuel solenoid connections (upper fuel tank rack shown).
1 Install and align the positional fittings.
2 Install the fuel pressure sensor.
3 Install the fuel temperature sensor.







4. Install the fuel tube nut fittings. On the upper fuel tank rack only, install the fuel vent tube fittings.







5. Install the electrical connector.
1 Install the electrical connector retaining screws.
2 Install the electrical connector.







6. Connect the electrical connectors.
1 Install the fuel tank temperature sensor electrical connector.
2 Install the fuel tank pressure sensor electrical connector.

7. Install the fuel tank(s).