Gasoline in a dream is usually a symbol of energy.
If you dream that you are driving or riding in a car, the amount of gasoline in the tank can be an indication of your level of energy in real life.
If your gas tank is running low or if you run out of gas in your dream, you could be working too hard. Your dreaming mind could be telling you that you need to find time to rest and relax.
Dreaming that you run out of gas can also be a warning that you are not eating properly and that you need to make sure that you are getting proper nutrition.
A dream that a car is moving despite having no gasoline in the tank can be a message that you have resources that you are unaware of.
If you dream that you are putting gasoline in the car of someone you know, it can mean that you are worried that they are doing too much and they will run out of energy.