[JFP in PA]

The canister itself is a passive device; what cause the codes and other issues are either failed valves that control the vapor flow to and from the canister, or blocked lines that prevent the vapor flow, or lines that become disconnected and cause vacuum leaks into the intake system.

The canister is a charcoal filled chamber that absorbs and stores fuel vapor from the tank and then vents it into the intake system to be burned when appropriate. All the rest of the hardware just moves the vapors around.

As for your fuel pump, yes it could be an issue, but can be tested using an appropriate gauge connected to the test port on the fuel rail. Some times these fuel pumps “come adrift” from their mounting inside the fuel tank and cause no end of problems, but are also very difficult to diagnose because the fuel pressure looks normal with the car stationary.