My engines was running fine, but had a front crank seal leak. I replaced the seal and the engine started just fine. It ran fine and showed no problems. The next time I started it it ran fine for a moment or two and then began to sputter and eventually died. At that point I determined that I had run out of gas. I put fresh fuel in the tank and now it simply will not start. I am fairly sure that it is a fuel delivery problem, but I do not know how to diagnose it.