I use the straw on a spray can of B-12 to prime carburetors when they've sat long enough to dry out.
Gas here leaves a thin crusty film on everything inside the carburetor when the fuel evaporates gone. Fresh gas doesn't dissolve the film...Just adds another layer when the carb dries out again.
The B-12 prime melts the cruds away and keeps the carb working like it should. Besides ease and convenience, it's worth the extra $$ to me just to keep the carb in tip top shape.
Clay
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