Judy, I'm going to be honest. I agree with the mechanic. So it really doesn't sound like the gas is the problem? Does it? If it goes in reverse and drives fine? It's getting gas. So when in drive, it's getting the gas, but the mechanical part of the tranny is not being able to move in the proper direction. Transmission work is pretty high on the list of difficult jobs and thus yields more money for you to pay, and the tech to collect. I apologize I can't give you an answer you want to hear about gasoline. My advice, given your situation, sell to someone who is willing to deal with this problem. Use money to buy a different car that doesn't have problems. Buy locally too, so you can bring to a repair garage you trust, and they can give the car a clean bill of health, before you buy