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Module 8: LNG Vehicle Systems and Safety Practices
Secondary Pressure ▪ Activates at 350 psi
Relief Valve ▪ Redundant pressure relief
▪ If red cap is missing, do not refuel
Vent Valve ▪ Used during fueling to reduce pressure inside
LNG tank to allow fueling
▪ Vents vapor back to fueling station
Fuel Gauge Sender ▪ Sends signal to the fuel gauge on dash of vehicle
to indicate the quantity of LNG in the tank(s)
NGV Essentials and Safety Practices © 2019 NGVi All Rights Reserved Page 8-6
