Fuel pump?

#2
if your tank is lower than the carb you will need a fuel pump. otherwise you are better off with gravity feed. A lot of carbs are designed to be gravity fed. If you use a fuel pump it may have enough pressure to push open the needle/seat and flood the carb. Mikuni have some small needle seat sets to allow fuel pump operation.
 
#3
You only really need them if your tank is lower than the carb inlet, or if the motor uses fuel faster than gravity can feed it.
 
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