Doomore

First, the nozzle does not fit down into the throat far enough to have the vapor recovery unit engage. I let it fill itself ONCE, the shut off did not work, shot gas out until I shut it off. Then it pushed another gallon or 2 onto the ground. Now I keep key on and monitor it so as not to depend on auto-shut off. Then when I pull nozzle out I get a fart of gassy mist out of throat. Where do I need to start to address issue.

2000 S430 W220

Thanks