You can never have "too much" fuel pump. I can't tell you how many times I see guys spraying 350hp and only using a 140gph pump to supply the fuel to the kit. You're asking for trouble and you're not getting all the power out of your kit! Not only is volume (gph, or gallons per hour) a factor here, but psi is as well. A pump's volume will change with psi changes and vice-versa. When dealing with a drag car and G-force's the rule of thumb is to have 3 times the needed psi coming out of the pump. For example, if you're running your nitrous kit at 5.5psi, you would want to have at least 16.5psi out of the pump. This is a factor when choosing a pump. Make sure that the pump you choose can supply adequate volume (gph) at the psi that you're going to be running it at. The engine pump is very vulnerable to fluctuation if it's not putting out enough psi. On an 8 second car you're pulling about 3g's off the line and it tapers down throughout the run. 3g's means 3 times gravity. So if you placed a scale vertically on your passenger seat and put a 10lb weight against it, at 3g's that 10lb weight would register 30lbs on the scale. So how much fuel do your lines hold? 20 feet of -8 line holds just under half of a gallon of fuel. A gallon of fuel weighs approximately 7lbs. So just sitting there the pump is pushing 3.5lbs of fuel. At 3g's that fuel weighs almost 11lbs. Pick up 11lbs. That's a fair amount of weight for a pump to be pushing to the front of the car. I wouldn't spray over 250hp with a 140gph pump on any application. On anything over 350hp I would recommend at least a 300gph pump and if you're spraying in excess of 450hp you should be running a 500gph unit. But once again, make sure that the pump you choose flows the volume you want at the psi you're going to be running at. Many manufacturers mislead you with their advertised numbers.