Our Weldon fuel regulators made adding nitrous a snap. The main regulator (right) circulates a constant 16-psi fuel pressure to the low-pressure regulator and returns unused fuel to the tank. The low-pressure regulator feeds 6 psi to both the carburetor and the fuel solenoid. Our Weldon pump has more than enough capacity to handle the load. With a 150hp shot, we estimate flywheel horsepower at 525.