SAFARI

18 4 PL FUEL SYSTEM Assembly : 1. Vapour hoses connections varies for each type of joint.Necessarycare tobe takentoconnect andclamp each hose correctly. Use suitable tool for fitment of clamp. 2. Donot kink/pinchor twisthosewhentheyare routed. This will reduce the effectiveness of the emission control systemandmay damage to fuel tank etc. 3. Tank pressure valve must be fitted right way round. Theport bearing theword“Tank”(tank end)must be positioned towards the tank. The port bearing the word“CAN”(canisterend)mustbepositionedtowards the canister.The vacuum port to be connected to T connector which is connected to intake manifold. (Refer schematic circuit diagramFig. 22) NOTE : Unless replacement is necessary, it shouldnot be removed from the circuit. Do not apply an excessive force to the tank pressure valve nipple. This may result in bend / damage. d) Carbon canister : Fig. 23 & 24 A canister made of high grade Nylon 66/PA66, containing special dust free activated carbon is used to adsorb fuel vapours.The lower endof the canister is open to atmosphere for ventilation.The end is not really open but there is foam filter. The purpose of the bottom filter is to protect the canister fromdust and dirt during operation. When the engine is inoperative (i.e.whileparked) fuel vapoursgenerated inside the fuel tankdue to fuel volatility are absorbed andstored inthecanister throughtankpressurevalve. When the engine is running, the fuel vapours absorbed in the canister are purged into intake manifold through canister purge valve operated by ECU.Thepurgingtakesplaceduetoairdrawnthrough the canister sbecause of pressure differential betweenmanifold vacuumand atmosphere. Removal: 1. Disconnect hose ( from canister to purge valve). 2. When the air is blown intoTank port, there shouldbe no restriction of flow through Purge port and Air port(i.e. canister bottomport). 3. If the operation differs from the above description, canister must be replaced. 4. Connect hoses to canister. 5. Ensure that hoses are clamped securely. Warning : Donot suck air through canister port. Fuel vapours inside canister is harmful. Fig. 24 Fig. 23