1999 Chevy Suburban Failure to start fuel issue?

On a visit to an appointment my suburban was running fine. I went inside for about 1 hour came out and the car wouldn't start. I did not hear the normal fuel pump noise when ignition was turned on and assumed it was the pump. I had the car towed home and I placed it in the garage out of the rain. The next day I went to drop the tank to replace the pump but before I did I turned on the ignition and heard the pump working and the car started. I drove it about a week without problem. I came home for lunch and the same thing happened. Convinced it was a faulty pump I pushed the car into the garage and the next day I was going to replace the pump. But it started again just fine. Now I am thinking that putting it into a dry warm garage is affecting some electrical component, computer or module. I can't see how it could affect the pump itself. I want to be sure before I go to the trouble and expense of replacing the pump. Any help is appreciated.