40 toward the core 78 the armature 74 can be prevented from touching the core 78 by a tube 84 that sits inside the second resilient element 68 thereby preventing magnetic lock up since very little electrical power is required for the solenoid 72 to maintain the valve 40 in its open configuration the power can be reduced to as little as 10 of the original power by pulse width modulation when electrical power is removed from the coil 76 the second resilient element 68 pushes the armature 74 and the valve 40 to the normally closed configuration of the valve 40 relieving pressure 26 is provided when there is a positive pressure in the lower portion 44 e g when the tank 12 is being refueled specifically the valve 40 is displaced to its open configuration to provide a very low restriction path for escaping air from the tank 12 when the charcoal canister 18 and hence the lower portions 44 experience positive pressure above ambient atmospheric pressure the first and second signal passageways 50 52 communicate this positive pressure to the separate portion 44 a in turn this positive pressure displaces the diaphragm 38 downward toward the valve 40 a diaphragm pin 39 transfers the displacement of the diaphragm 38 to the valve 40 thereby displacing the valve 40 to its open configuration with respect to the lip seal 70 thus pressure in the charcoal canister 18 due to refueling is.