There are many reasons why the fuil pump may not be running i would not run out and perchase a pump until it has been checked out by some one with the corect gear you may be wasting your money
To be honest it dose not mater what colours you use if you are giving a choice to riders and every one knows which flags to follow all should be well
the only posible problem is observers not knowing who should be on what rout maybe a coulor plate on the front of the bike
To be honest it is rediculas a lot of individuals take the time to put on events like this
and people like you just want to complain and cause problems for every one.
just go out and ride it dose not always go your way but that is life trials riders learn to take the good with the bad