3. The regulator comes from Holley with the regulator pressure preset to approximately 7PSI.
4. However, for individual requirements, it may be readjusted. Loosening the regulator locknut and turning the adjustment screw
clockwise increases the pressure. Decrease pressure by turning the adjustment screw counter-clockwise. Use a fuel pressure
gauge to monitor changes.
WARNING! ALWAYS USE A FUEL PRESSURE GAUGE BETWEEN THE REGULATOR AND THE CARBURETOR(S) WHEN
ADJUSTING THE FUEL PRESSURE REGULATOR.
NOTE:
With carburetor set-ups, any change made in fuel pressure will change the fuel bowl float level. A readjustment in fuel
bowl levels will be required for proper and safe operation of the carburetor.
5. Start the engine. With the fuel pressure gauge registering fuel system pressure, check for fuel leaks from and around the
regulator and all fuel lines and connections! If any fuel leaks are found, remove any spilled fuel and repair the leak befor e
proceeding!
6. If the fuel system holds pressure and there are no fuel leaks, start the engine and hold at
2500-3000 RPM. Set the main pressure adjustment screw of the regulator to the desired operating fuel pressure (regulator is
adjustable from 3-21 psi). Turning the adjustment screw clockwise will increase fuel pressure.
7. Once the desired operating fuel pressure is achieved, tighten the regulator adjustment jam nut.
8. Next with the engine at idle rpm, loosen the jam nut on the idle pressure adjustment set screw (low pressure). Turn counter
clockwise until the desired idle pressure is achieved with the engine running at an idle. This pressure must be lower than th e
operating system pressure. Once the desired pressure is achieved, tighten the set screw jam nut.
9. Test drive the vehicle to ensure proper operation and re-check the fuel system for leaks. If any leaks are found, immediately
shut off the engine and repair the leak(s)!
Figure 2a (Carburetor Only)