Chicago Pneumatic compressor starts and runs then stops

I have an older CP tow behind 185cfm air compressor with a Hercules 4 cylinder gas engine. It starts great and runs for a few minutes and then stops.


Everything on the engine has been tuned up properly but I don't understand how the throttle works on these things or what regulates the air build up.

I backed off the inline regulator under the hood by the compressor and it seems to make no difference with this issue.

I have the external valve open when I start this unit like I always did so I don't see how if any pressure stop is shutting engine down.

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