DO NOT REMOVE CARB as your first step. First step is ALWAYS to add a good shot of Seafoam to the gas and into the carb. Fire it up or give it a few pulls to work the gas and cleaner into the whole system. Take and spray carb cleaner into the carb. Let it sit over night. Keep the auger in a nice warm place so the cleaner can do its work the best.
In the morning, install a brand new pug, prime with bulb. Check for any leaks, then fire up auger and let run on low to med idle till warm. If needed, adjust low speed mixture and idle screw.
Most Jiffy's are Diaphragm type Carbs and do not have an actual float and float bowl. If you have gas leaking before it gets to the carb it is more likely a cracked hose or defective bulb/clamp etc, If you have gas leaking at the carb then likely the o-ring is broken, but this almost never happens unless the carb was removed, check to see the carb bolts are tight.
Let us know how you make out.
Drawing of typical auger carb.
