I find that removing the charcoal filter can cause a build up of fumes inside the rear clam, especially if always garaged.
I would not recommend removing it, but it appears yours has already been removed. My advice would be to refit it and connect it back up to the throttle body via the fuel tank vent valve (evap) shown above (the thing doing nothing)
The last thing i thought i would buy to the car...
Does the system also hinder fuel leakage if a rollover would occur?