Gas tank location on a fabrication

#1
Hi Folks:

Question, so when fabricating a gas tank on a minibike or go kart that is not a part of the existing motor, should it be mounted above the motor to ensure that gas flow goes directly down into the carb? Can I floor mount a tank or would I need a fuel pump to get the gas to go up the line into the motor? Your thoughts please.

Thanks.
 

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