1977-79 Models

Install pressure gauge and 3-way valve assembly in fuel line, between fuel distributor and control pressure regulator. See TEST EQUIPMENT HOOK-UP in this article. With engine cold, remove plug from control pressure regulator.
Open valves for lines "A" and "B" on tester. Start engine and allow it to idle. Quickly read control pressure. Pressure should be as specified in COLD ENGINE CONTROL PRESSURE TEST table. See Fig 1. If pressure is incorrect, replace control pressure regulator.

COLD ENGINE CONTROL PRESSURE TEST ⁽¹⁾

Application

Pressure psi (kg/cm² )

1977-78 Models

Federal & Calif.

17-22 (1.2-1.5)

High Alt

20-25 (1.4-1.7)

1979 Models

280 & 450 Series

23-28(1.6-1.9)

6.9

20-26(1.4-1.8)

⁽¹⁾	With temperature at 68°F (20°C). If temperature is higher, pressure will be considerably higher. If temperature is lower, pressure will also be lower. See Fig 1.

Fig 1: Cold Engine Control Pressure Test Graphs (Typical)

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