I have already change my gas cap and still getting a check engine/evaportion warning. My fuel ecomony was running at 8.3/100km and is now at 9.2/100km please help. I dont know what to check next? This is the second time in two months that I have had this warning light on. I have changed the air filter already and still this warning persists. Should I check fuel filter or something else.
You're way off in the wrong area. The air and fuel filters have nothing to do with an evaporative emissions system code. Any codes related to that refer to the fuel supply system meaning the tank, charcoal canister, and all the hoses and valves that are part of the vapor recovery system. Chrysler was using that system already in the late 1960s, but now we monitor it for leaks. The most common leak is a loose gas cap but you have a whole system to look at. All you can do is look for cracked or loose hoses and missing hose clamps that have rusted off. Beyond that you will typically need a smoke machine. Those allow you to inject white, non-toxic smoke at 2 psi into the system, then you watch for where it sneaks out.