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[ArrowHeadJim]

I believe it's in the rear oil cooler header( that thing the filter screws on to ).

You said you replace the oil pump.

So still, there is "no" oil pressure off the low pressure oil pump?

If there is no pressure there must be a hole some where.

Well ya go things all apart may as well check the valve in the rear cooler header.

If you r re build in your gona take it apart anyway.