5 4 PL FUEL SYSTEM The fuel system consists of : 1. Fuel tank assembly 2. Electric intank fuel pump with in built pressure regulator 3. Fuel level gauge (tank unit) 4. Fuel filter 5. Fuel filler cap 6. Fuel hoses, fuel lines and fuel rail (i.e. delivery and vapour lines) The evaporative emission system consists of : a) Tank pressure valve b) Canister purge valve c) Carbon canister d) Restrictor e) Vapour separator GENERAL OPERATION OF EVAPORATIVE EMISSION SYSTEM: The systemoperateswhenoutside temperature is higher, after the vehicle has been parked / standstill for a long time, the fuel temperature increases andbrings about a pressure rise inside the tank.This increasemay occur withmedium - low fuel levels or with the tank full condition. During tank refilling, the pressure inside is more or less same as atmosphere pressure.The breather port on fuel tank is connected to the breather port on filler neckwhich allows tank breathing during fuel filling. When the tank is completely filled, there is small pocket of air provided for efficient operation of the evaporative control systemwhen the vehicle is running. When the fuel filler cap is closed, it seals the system, the vapours generated inside the tank (with vehiclemoving or while parked) build up due to fuel volatility, and tank internal pressure also builds up until the tank pressure valve opening level is exceeded. When the engine is inoperative, (i.e. while parked), fuel vapour generated inside the fuel tank due to fuel volality are absorbed and stored in the canister.When the engine is running, the fuel vapours absorbed in the canister are purged into intakemanifold through canister purge valve operated by the ECU. Warning : ● Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire. ● While removing the fuel tank fromthe vehicle, keep sparks, cigarettes and open flames away from it. ● Before repairing fuel tank assembly, clean it thoroughly. ● Disconnect negative cable terminal at battery. ● Always wear safety glasses.
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