DIRECT FUEL INJECTION
90-855347R1 JANUARY 1999 Page 3B-39
Air Pressure Regulator
Regulator Closed Regulator Open
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1-Top Cover
2-Expansion Plug
3-Spring Retainer
4-Vent
5-Spring
6-Diaphragm Seat
7-Air Rail
8-Air Passage (from Air Compressor)
9-Excess Air Passage (to Exhaust Adaptor)
10 - Fuel Inlet Passage (from Electric Fuel Pump)
11 - Diaphragm Assembly
12 - Calibration Screw (Do Not Turn)
The air pressure regulator is designed to limit the air pressure inside the rails to
approximately 80 psi.
The air regulator uses a spring (pressure) to control the air pressure. This spring (80
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 ex-
cess air passage leading to the exhaust adaptor plate.
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