Why is it that I can't operate the nitrous unless the fuel guage is at least 3/4 full? Does it starve the pump if it isn't full enough? I assume that when the guage reads 3/4 the tank is actually about 1/2 full. This makes me very angry. And also, would adding a bottle of NOS Racing formula octane boost to 6 gallons make 89 octane safe to run a 125 shot on?