When I try to put gas in my tank the nozzle keeps clicking off.

I had the same problem for over a year and keeps getting worse Mechanic charged me for one sensor (and that fixed it for about a month) and now wants to replace the sensor for the gas tank vent I told him it was a venting issue I looked for the charcoal canister behind the back wheel on the driver side and couldn't find it, just a bunch of tubes and stuff

NAW,that won't work! it's a common problem on that vehicle...it's a venting problem,nothing to do with where or how far the nozzle is in!