Cold Engine Control Pressure Test

NOTE: Engine must be cold for this test, preferably having set overnight at test site without operation.

Install pressure gauge and valve in fuel line between fuel distributor and control pressure regulator.
Valve assembly should be on control pressure regulator side of gauge. See Fig. 3.

Fig 1: Connecting Fuel Pressure Gauge and Valve To Test Control Pressure
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Turn ignition ON. With fuel pump running, bleed and then OPEN valve.
Unplug electrical connectors from control pressure regulator and auxiliary air regulator. Start engine and idle for maximum of one minute.
Note control pressure and refer to graph in Fig. 4. At normal room temperature, about 68°F (20°C), pressure should read between 18-24 psi (1.3-1.7 kg/cm² ).
If pressure does not read within specifications, replace control pressure regulator.

Fig 2: Graph Showing Cold Control Pressure at Various Temperatures

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