Sullair 375HJD won't stay running

by Roger
(Springfield, MO.)

After starting and loading compressor it will run about 5 minutes and the shut itself off showing SPN 970 FMI 31 auto shutdown on display.

Changed oil in engine, installed new lift pump and topped off compressor oil (Sullair AWF).

Engine ran a bit longer, but still shuts down showing the above code.

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