Service Notes

WARNINGS

- Tank venting is required prior to tank solenoid valve service.

- Always assume that all fuel system components are under full pressure at all times. Use caution when servicing.

- Fuel supply lines will remain pressurized after engine shutdown. When servicing fuel-related components, do not smoke, carry lighted tobacco or an open flame of any type. Flammable mixtures may be present and ignite, resulting in possible personal injury.

- Eye and ear protection is required to be worn during venting or removal and installation of fuel system components.

- The status (stuck open, stuck closed, does not operate or good) of each fuel tank solenoid valve must be identified prior to venting the tanks. Refer to diagnosis and testing.

- Venting of tanks without identifying solenoid valve status could result in an unexpected release of natural gas into the atmosphere.

- Fuel tanks must be vented in sequence: stuck open, functioning normally, stuck closed or does not operate. Venting out of sequence may cause possible personal injury.

Typical Vent Stack Installation:

SERVICE NOTES

- It is recommended that venting be performed with a vent stack. Any vent stack installation must be approved by local authorities.

- The procedures provided are required to be used when venting fuel from the fuel tanks for service or removal of fuel tanks and fuel tank solenoid valves, when service or tank recertification is required.

- Do not vent any fuel tank unless the fuel tank or solenoid valve is being replaced. Unnecessary venting of good tanks and valves could cause damage to the solenoid valves.