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evaporative system. The diaphragm actuates the switch. This is above the opening point of the fuel inlet check The normally closed valve in the NVLD is intended to maintain the seal on the evaporative system during the 9 to 6 9 H2O (0.75 to 1.5 KPA), the valve will be pulled off the seat, opening the seal. This will protect the system from excessive vacuum as well as allowing suf- The solenoid actuates the valve to unseal the canister vent while the engine is running. It also will be used to close Another feature in the device is a diaphragm that will open the seal in the NVLD with pressure in the evaporative 9 blow off 9 at about 0.5 9 H2O (0.12 KPA) pressure to permit the venting of vapors during refueling. An added benefit to this is that it will also allow the tank to 9 breathe 9 during increasing temperatures, thus limiting the pressure in the tank to this low level. This is beneficial because the induced vacuum during a subse- The device itself has 3 wires: Switch sense, solenoid driver and ground. It also includes a resistor to protect the REMOVAL The NVLD pump (4) is located at the front of the fuel 1. Raise and support vehicle. HB EVAPORATIVE EMISSIONS 25 - 15 |