I found a kit available online to replace the sprout on your gas can to a free flowing one. I do not have any affiliation with this site, but am providing this information in case anyone is interested. I've provided a link below, but in case it doesn't work the site is www.ruralking.com
and the kit can be found under the search function by entering this part number...015156001. The kit is on sale for $7.99. This might not be available for long since the kit may not meet EPA restrictions.