I would write a very nice letter to the board stating reasons for the necessity of the pump (and the urgency).
I would ask them for a letter of explanation as to why a decision has not been made on 2 separate occasions.
I would out of courtesy copy my consultant in, or inform him first of what I was going to do.
I would even try to find out when the board is next meeting, and even ask to attend the meeting for a slot to state your case.
Sometimes a written approach to professionals or a personal one can scare them a little, as this would be totally outside of what they are used to.
Think of it from their side.....who would be the spokesperson to tell you no, who will have the guts to write you a letter of explanation as to why they can't make a descision. Who will they get to tell you that you can't attend etc......They would really have to get their thinking caps on as to whether they have been reasonable.......and to how they really stand in a case of law.....
Tell them you reserve the right to publish contents of any correspondence and to record all conversations....
I would really approach from a slightly different angle to get their attention if I was you....a nice but firm way with a reasonable, understanding approach and attitude does sometimes throw professional people to knowing that you really want a decision of yes.....