Fuel Tank Vacuum

[Godguy]

Hi, I have a '93 240 and my fuel tank vacuum (the one that goes to the carbon canister) is purging a lot of fuel into the carbon canister... I changed my gas cap and the little fuel check valve(outside of the tank)and it continues to bug and have an irregular idle...
Could it be my FUEL PUMP?
***And can I take off the fuel check valve and leave the fuel tank without any rubber hose on that vacuum???***
ANY POSSIBLE INPUT WILL BE VERY APPRECIATED cuz I'm loosing fuel on the ground and the fckn fuel is PRICEY !!!!!!!!

Thanks