Installation manual

90-898305

3-12

Air Pressure Regulator

The air pressure regulator is designed to limit the air pressure inside the rails

to approximately 80 psi (95 psi on 1.5L Models).

The air regulator uses a spring (pressure) to control the air pressure. This

spring (80 or 95 psi) holds the diaphragm against the diaphragm seat. The

contact area blocks (closes) the air inlet passage from the excess air, return

passage. As the air pressure rises (below the diaphragm), it must reach a

pressure equal to or greater than the spring pressure holding the diaphragm

closed. Once this pressure is achieved, the spring compresses, allowing the

diaphragm to move. The diaphragm moves away from the diaphragm seat,

allowing air to exit through the diaphragm seat, into the excess air passage

leading to the exhaust adaptor plate.

Sectional View

AIR REGULATOR VALVE

a - Vent hole

b - 80 lb. spring (95 lb. spring on 1.5L model)

c - Diaphragm

d - Air dump

e - Fuel passage

f - Air passage

g - Air vent opening

Notes

_______________________