great thanks for the fast reply. would i need to put an inline fuel pump in to suport 1000cc injectors or will the walbro 255 still work. the dc shouldnt be that high at all
Well, doing some quick, generic math...
1000cc/min X 4 injectors X 100% DC X 60 min/hr = 240 liters/hour demand
The walbro 255 is rated at 255 liters/hour at 43.5 psi.
That doesn't capture all of the variables, but there is some quick math for you. So yes, a walbro 255 should/can keep up with 1000cc injectors, even at 100% DC. You are getting close to the limits though. Obviously, you want the pump to easily outflow the injector demand.