Green Key Light Flashing

Electrical problem 6 cyl Front Wheel Drive Automatic 258000 miles

A number of miles back the car had the ignition switch replaced because of the recall. About 2 years ago, we had the same problem where the car would not start and the green key light was flashing. We replaced the Ignition Switch again and just fine. Last night my daughter, who now uses the car, just went out and the car would not start. Cranks just fine. Just won't catch. The green key light was flashing again. This time I replaced the ignition switch myself. Guess what, did not start. Smelled gas though. There was no warning and it has been about 70 degrees outside. I read where the main relay may be bad. The green key light is flashing after trying to start and what I thought was strange is that we used two different keys. Both of which worked yesterday morning. Should I try the relay or get another key or am I missing something.