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Solved it today. small vac leak at the air pump to the purge can.
I have the same problem. I have found that if replacing the gas cap does not work you need a canister purge valve and/or canister purge solenoid. I know nothing about vehicles ..This is just what I have found out .
It is on the drivers rear of the intake. It has two vacuum lines and a two wire plug.
Purge solenoid.
It is located on the firewall above the back of the valve cover on the driver's side of the engine. It is mounted with a rubber and slides up and off the mounting bracket.
Yes, a 2003 Ram has a purge valve.
next to the evap can on the right side of the car behind the front bumper you will also see the vacuum switch in line with it. as the flow moves it will be the purge valve then the vacuum switch.
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
To the right of the battery, when looking at engine.
180 foot pounds
Check under the battery box.
evap. purge solenoid circuit failure