car won't start!!!(sometimes)

[supfoo514]

Sometimes my car just won't seem to start. Its not the starter cause I can hear it cranking. Pumping the gas doesn't always work. Usually I have to give it a couple of tries before the car will start. This started happening a couple days ago. Before then it started pretty well. You would have to give some gas on cold starts in the morning but would start right up after that. Now it just seems to not want to start. I was wondering what could be causing this. Could an oil leak be causing this because there is a leak in my oil pan which I plan on changing pretty soon. Any help would be appreciated. Thanks.