Needs to be on it's own ground rod. While there are various 'rules' about ground rods, to be technically correct, someone needs to run a ground conductivity test at the tank site. This literally tests how conductive the dirt is, which translates to how deep the ground rod needs to be. Less conductive = longer rod. If you can't get the conductivity test, drive a rod as deep as possible, then bond it to the tank. This is a safety item for ANY tank, regardless of power source or even without electrical power. It protects against static, near misses from lightening, and damaged/failed electrical equipment.
Even with the ground rod properly connected, make sure the pail, barrel, vehicle, or aircraft is grounded to the tank BEFORE you reach for the filler nozzle.
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