ENGINE 273 MPFI 201 ENGINE TANK PRESSURE VALVE : The tank pressure valve is provided to keep the pressure in the fuel tank constant. The valve operates according to the pressure inside tank. 1. The tank pressure valve opens out when pressure differential occurs between the tanks side and canister side ports and allows Vapour from the tank to carbon canister. When the pressure inside the tank becomes positive and exceeds on established level of 1 – 1.5 Kpa valve opens out. 2. When the pressure in the fuel tank becomes negative (vacuum) and reaches it specified value it open the valve to let the air flow in the fuel tank via canister. Inspection: 1. Check tank pressure valve for crack or damage. Replace if necessary. 2. Air should pass through valve smoothly from fuel tank side at moderate pressure. 3. Air also should pass when blown smoothly from canister side at moderate pressure. 4. If air does not pass through valve in step 2 or hardy blows required in step 3, replace tank pressure valve. Warning: Do not suck air through tank pressure valve. Fuel Vapour inside the valve is harmful. Removal: To avoid damage to the Vapour hoses whi le disconnecting slide back the clamps and pull the hoses. Assembly: 1. Vapour hoses connections varies for each type of joint. Necessary care to be taken to connect and clamp each hose correctly. Use suitable tool for fitment of clamp. 2. Do not kink/pinch or twist hose when they are routed. This will reduce the effectiveness of the emission control system and may damage to fuel tank etc. 3. Tank pressure valve must be fitted right way round. The orange colour side must be positioned to face towards canister . NOTE: Unless replacement is necessary, it should not be removed from the circuit. Do not apply an excessive force to the tank pressure valve nipple. This may result in bend / damage.
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