What would happen if i installed a walbro 255 fuel pump in my hatch with bone stock fuel system for b18c1 and blox tuner spec A cams and skunk2 manifold? could the flow rate of the pump cause fuel leaks or could the engine just run really rich on gas? Or could that kind of pressure destroy the pump? Would i need to install an adjustable fuel regulator?

 

I would assume same amount of fuel but less work on the pump.

Why are you changing fuel pumps? Stock fuel pumps are fine for 200 or less whp.

 

You'll bypass more fuel. That's it.

The pr valve determines the system pressure and the ECU determines how long your injectors stay open. Unless you change either of those two things, your engine has no idea what fuel pump you are running.