How long has it been sitting?

If it's been close to a year or longer, you may need to drain the fuel
tank and fill it with fresh gasoline as it might have "turned".
Gasoline breaks down into a varnish when it sits for long periods. It
leaves a sticky goo film on all the internal carburetor parts.

If it's just been a few weeks or so, pouring a small amount down the
throat of the carb works just fine. Hopefully your fuel pump is
working. You don't want to run down the battery endlessly cranking.

Forrest