You can leave the cables connected.....switch off gas....diconnect gas feed a.. turn carb upside down and remove the 4 bottom screws on the bowl. Be careful don't ring them - lightly use an impact driver if needed - but, repeat don't ring them.
Then remove the float - gently drive out the pin -only drives one way... use a nail if you haven't a fine punch - then take out the valve which is attached to the float.
Next - unscrew the jets - the brass screws facing down - soak them or blow them clean - or use a single wire to make sure you can see through the holes in their sides.
Go back to the plunger on the side - 2 screws - dismantle and clean.
If you have a new float valve - all the better.
If you have carb cleaner - blast it around the place - or seafoam.
A Q-Tip is ok for cleaning.
Next- gently remove the very bottom drain screw and check its gasket - blow some carb cleaner or air through it.
Put it all back together - don't worry about the jets - they will only tighten to seat.
Don't overtighten things.
95% of the time you have fixed things.
An hour tops should do it.
Possible that your fuel tank is contaminated with stuff - its not such a big job to take it off and swill it clean with fresh gas and a strainer/filter while you have the carb off - should prevent further trouble.
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