What Stumpy said, eng off/remove air cleaner & pull the throttle at the carb & see if you have any squirt. rather than a complete rebuild you likely could get by with tossing in another pump tho it'd be better to go thru it especially since it has been in storage as the rest of the carb systems are likely gummed up to some degree. You could take the top off & replace the pump shaft/plunger assy. Might be a carter WCFB 2041S & either get a kit locally which will have the plunger or there's one on eBay. The owner of "the carb shop" in Eldon Missouri (decent guy to deal with) might sell you an AP seperately. Google it