Would Japan have needed to bomb every oil tank to cripple Pearl Harbor's reserves?
Short answerNo; striking the pumping station and fuel lines could have immobilized the whole distribution system and delayed other recovery work.
NotesDestroying individual tanks would burn stocks, but the United States could replace oil from its enormous production base. The harder problem was moving that fuel from storage to ships in the quantities a fleet required. Damage to the pumping station and fires in the connected distribution lines could require months of repair. That delay would also obstruct fueling for the heavy equipment used in salvage and ship repair, multiplying the operational disruption beyond the immediate loss of oil.