Stopped and filled my 95 4runner up today. Went by shop to get tools and smelled gas strong as I was putting them in back of truck. Had a small puddle of gas on the ground. Looked to be leaking up high on side of gas tank by passenger rear wheel. But could not see exactly where it was coming from. How bad of a job is it to get tank off. And if it is tank how much should I expect to pay for one. THANKS