Why does my car smell like gas & uses way too much gas and is leaking gas on my engine out of a line?

I don't know if your stating that gas is leaking on your engine but anyways....other than the bad syntax in your sentence. You may have leaky injectors and there maybe too much fuel getting into your combustion chamber and getting stuck around the catalytic converter which will give you really bad gas mileage, smell like fuel and destroy you Cat.Converter. Start with injectors to see if they are leaking and check all fuel lines thoroughly. Also check your charcoal canister (black canister on the firewall) to see if its broken, cracked or leaking anything. If its very strong. Check near the tank itself. If you ever see fuel on the ground when you fill your tank, you may have a torn line at the tank or the seal around the gas tanks fuel sending unit is leaking is leaking. Good luck Plz rate

You have a leeking fuel injector

There are orings in the hose conections that may need to be replaced. it takes a special too to disconnect the connections. it is a simple tool but is nearly impossible to disconnect them without it. it is usuallly made out of plastic and you click it over the line and slide it into the connection to release the tabs inside.
The injectors also have orings that are more prone to leak than the hose connections. those can be replaced also. you are going to want to use the proper orings that are fuel resistant. I get them from the dealer.