4A Z0 EMISSIUN CONTHOLS EXllAUS SYSTEMS VI check the condition of the sealing gasket Replace the canister inspect the liquid check valve and replace if filler cap if the gasket is damaged or deteriorated necessary Inspect the fuel tank for evidence of fuel leakage The filter pad located at the bottom of the canister stains Trace any stain back to its origin and repair is the only serviceable item of the canister assembly or replace the tank as required It should be replaced at 15 000 mile intervals on Inspect the fuel and vent lines for leakage or Cherokee Wagoneer and Truck models and 30 000 damage repair or replace as required Be sure all con miles on CJ models as prescribed in the Mechanical nections are tight Maintenance Schedule located in Section B of this If liquid fuel is present at the fuel vapor storage manual Pm Pam Gnnnral M Z0 PGV VaIv Flaw Glurl 4A ZZ PGV Alr Inlal Flmr IA 2I PGV Valvn Tm IA 21 GENERAL air cleaner element and carburetor and burned along with the fuel air mixture This system incorporates a calibrated airflow PCV valve connected between an intake manifold vacuum The WFMVE ankcase Venhlalmn system performs source and the engine Crankcase vapors are drawn two funmonsi through the PCV valve into the intake manifold where Prevents mmbustlon bluwbl fmm enwmlg the they are burned along with the fuel air mixture fig qSph 4A 20 The oil filler cap is closed in this system to Venulates the cmllkcase Wmh clean mr t help prevent any crankcase vapors from entering the at pmventthe mrmatlon fSl l mosphere During periods of relatively high manifold vacuum such as idle or cruise speeds outside air is drawn NONNENTED gmgAL OSE from the air cleaner into the crankcase On six CAP CLAMP cylinder engines the air passes through a f NNE T0R polyurethane foam filter located in the air cleaner fig pw 4A 21 On V 8 engines the air passes through a VALVE XGROMME1 polyurethane foam filter located in the oil filler cap 44 The filler cap is connected by a hose to the air cleaner G MMET A N HOSE fig 4A gg E Q M acumen If crankcase vapor pressures blowby exceed the ifi M flow capacity of the PCV valve airflow in the system Iilllll FILTER will reverse Crankcase vapors are drawn through the Ll 5 m m ii i i i l 4 II l EE 5 5 ci lifnzn L Mazen Annes Fig AA Z0 Pnsltlva Grsnkcm Vunllallan Valve Flaw F q IA Z1 PGV Symn Six Gyllndu