ENGINE 82 i) Tank Pressure Valve (TPV) : The tank pressure valve is a two way valve provided to keep the pressure in the fuel tank within safe limits. The valve operates according to the pressure inside tank. 1. The tank pressure valve opens out when pressure differential occurs between the tank side and open side port and allows Vapour from the tank to the atmosphere. When the pressure inside the tank becomes positive and exceeds on established level of 1 – 2.5 Kpa valve opens out. 2. When the pressure in the fuel tank becomes negative (vacuum) and reaches it specified value (1.6 Kpa vacuum) it opens the valve to let the outside air flow in the fuel tank.
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