leaking gas or fluids that smells like gas

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I noticed monday my car leaking in front of right rear wheel i bent down to smell it it smelled like gas and it was a heavy gas smell. I also had my heater on since it was cold which heater isn't working right either.Anyway it leaked for about 3 or 4 hrs on and off only seemed to do it while car was off and set for a while.Stopped by garage( i had cut heater off for a while )the car stopped leaking not a drop it seems like if i started heater it would do it.