I have a 2001 Ford Explorer Sport Trac that won"t start. It turns over fine.

I did not hear the pump run after loosening the gas cap and turning the key to on. Another thing I noticed, was when I was able to start the car this afternoon, I was able to pull the key out of the ignition and the car kept running. I was able to turn the car off without the key and able to restart it without the key.

I think you've narrowed down the problem area!

What does that mean ? What do you think the problem is ?

someting wong wit ignition switch!! Should not be like that!! Get a pro to evaluate (for safety reasons)!

Took it to the repair shop. ASfter much testing , it was determined that it was the fuel pump pressure causing the issue.

Good , I'm glad you got one part fixed(hopefully) , but from your description , the lock cylinder for the ignition is not functioning safely , did they check that,or even notice if not told?

I did tell them and they checked it out, but not sure to what extent.

Be safe! .