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Tubs has the right approach, there is a real risk of turning the tank into a “football” if high air pressure is used absent the flat constraints. I attended a seminar at Constantine last July put on by Jay Walls about tank restoration, he made the point about too much pressure with out restraints. Another approach that is referred to in that old Jounsom shop manual is to use low pressure ( 3- 4 PSI ?) and apply heat to the dented area. This will weaken the localized area allowing it to move, not affecting the cooler area. This only works on shallow dents, if there are “creases” , its a no – go. If there are creases locking in the dent, the only fix is cutting the tank open and doing hammer and dolly work.
Joe B