1991 Geo Prizm Gas Odor, Cost, Time

In the past week I have noticed the odor of gas outside my car from the driver's side door to the front of the car. Periodically I smell it inside the car but not often. There is no leak at the front or back of the car. Looking at your answers I will be having the fuel injectors/hoses/etc. Checked. However, I may need to wait a bit due to money. How much would it cost to have the parts you mentioned replaced, how long is it okay to wait, and what would be a signal to get the car in immediately? If I wait is it okay to drive it a couple of times a week? Thanks for the help.