Are you positive the pump is providing fuel?
You could disconnect the carb inlet line and pump the bail on the pump to make sure fuel is getting that far. I have had a priming issue before, got tired of pumping the bail and got an outboard style squeeze bulb to bring fuel to the pump. Once the line upstream of the pump was full of fuel it started right up (I did not leave the bulb in the line).
If you confirm the carb is getting fuel, either by running the pump or with a pressure gauge between the pump and carb, then it's on to the top of the troubleshooting list. Check for spark and compression. If you have points, I've read they usually need a wipe or file for startup after sitting idle.
Many more experienced people will be along to help track down and correct the issue.
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