Going to switch from my old walbro 307 to the new racetronix dual intank pump, what turn on point do most people use 4lb, 7lb, or 15lb. Car is Gn1 headed, 70mm turbo, built motor,83lb inj, dual nozzle alky kit from alkycontrol. or should I run them both all the time and run new lines? running 22 psi right now but seems like I'm running out of fuel.