(7) To increase the pressure of a spring-type regulator:
(a) Pry off the protective cap.
(b) Turn a set-screw wrench clockwise in the adjusting screw and read pressure on gage.
(8) To decrease the pressure of a spring-type regulator:
(a) Turn the set-screw wrench counterclockwise more than is considered sufficient to effect the desired reduction.
(b) Turn the pressure-tank valve off.
(c) Relieve pressure in the fuel tanks by compressing the fuel valve until the pressure is below that desired.
(d) Release the fuel valve.
(e) Open the pressure-tank valve and allow the system to reach a state of equilibrium, which occurs when the hissing sound ceases.
(f) Repeat the steps described above in (6) and (7).