Leaky Tire

I have a brand new Hancook 205/75/14 tire on my sbp steelies on my '68 Dart. I walked into the garage this morning and I found it flat. I don't believe it was yesterday. I jacked the car up, dismounted the wheel, and used my portable air compressor to start filling it up. Anyways, it seems I've developed a leak on the valve that fills the tire up. I didn't see or hear any additional punctures and the tire seemed to be seated properly. Is there any good ways to fix this or am I going to need to buy a new wheel? I've only put about a couple hundred miles on these tires.