Only one canister, the charcoal canister.

 

is that what you're referring to when you say canister?

 

Yes it is

 

bought a new canister vent from AutoZone but didn't fix my prob. Gas still leaks.

 

Then it's probably a clogged Charcoal Canister. Can you see where the leak is coming from?

 

Can I blow it out if the charcoal is clogged? Gas still leaking from the vent canister or in that area next to the driver rear wheel, up by filler neck.

 

No you can't blow it out. One way to test the charcoal canister is to try to blow through it through one of the ports one of the hoses is connected to (Sorry, can't remember which) If you can't blow through it it's clogged. I saw a video on YouTube where a guy that took his canister apart and put in new pellets and resealed it with silicone or something, but I wouldn't do that. Too much of a PIB to drop the tank to take a risk on a failed sealing job.
The primary cause of a failed charcoal canister is over-filling the tank (Topping off). If you try to top it off the excess fuel goes into the canister which damages the charcoal pellets.
I'm starting to think you have more than one problem. First of all fuel should never leak from anywhere in your car under any circumstance. Three things could be going on.

1. You have a hole in the filler neck or a hose connected to the charcoal canister that fuel is leaking from. You really need to get down and see exactly where the fuel is leaking from. Have somebody else pump your gas while you lay on the ground and look.

2. The Charcoal canister is clogged and full of gas and backs up into the filler neck when it should be passing the vapors through to the vent solenoid.

3. If anyone has ever tried to siphon gas out of your car through the filler neck, the check valve (AKA check ball) in your fuel tank inlet may be damaged. The purpose of the check valve is to prevent fuel from spilling out if the car if it rolls over. It's normally closed except when filling up. When the tank gets full the check valve closes, backpressure is sent up the filler neck which is sensed by the fuel pump and shuts the nozzle off. If the check valve doesn't close when the tank is full gas would spill into the charcoal canister and/or out the hole in the filler neck or hose to the charcoal canister.