Carbed Turbo FPR

You need to have a boost sensing regulator with a return line. You should run 6lbs of fuel pressure over boost.

carb FPR

You need to have a return line back to the tank. If you do not have one when the sled is started the fuel presure will just fill up the float bowls and flood out the motor and carbs. The pump makes what ever presure it makes to the FPR. The FPR controls how much presure you have at any given point to the carbs and only uses the fuel it needs(what ever it is set at 4psi) then dumps the rest back into the tank. But like Mountian said you need to have a boost sensitive FPR so as the boost comes up so does the fuel presure. If you are only running 7psi and you have a 1-1 regulator then the fuel presure should only reach about 11-12psi of presure at 7psi of boost, if that is the case then it sounds like you will have enought fuel presure to run the 7psi of boost that you want. If you run 10psi of boost you will be very very close on the fuel presure, I would be very careful at that boost level because you would be max presure and then some on the pump you have. A boosted motor will not last long when you do not have enought fuel, it makes more power and they break alot quicker!

Hope this helps

also make sure that you have enough volume at 14 psi. because the more psi the less volume. I have seen pumps that will not keep enough volume at the sustained pressure.