If you are not getting fuel to the carb with a new pump, there is probably a blockage somewhere. I had this problem too. Blow all your fuel lines back to the tank (Be sure to remove the fuel cap!!!). Once you get those clear (you'll hear air in the tank), if it still aint gettin fuel to the card you know the problem is under the hood.
Before removing the carb for rebuild, one thing to check is where the fuel line attaches to the carb. Follow the fuel line from the fuel pump to the carb, take the fuel hose off, then remove the nipple it was attached to (you may have to move some stuff to get it off). Once you get it off, take a light and look inside and see if there is any blockage there. Mine was packed solid with crap, not letting fuel into the carb.
Its probably not a bad idea, if you've gone this far, to go ahead and drop your fuel tank and clean it out too.