I repaired a Ford Motorcraft carburetor recently with the same problem. That one used a readily-available thread, a 1/2"-20. It will depend on whether the thread on the fuel inlet is a size that a Heli-Coil is made for, or something oddball.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!