If you have the same adaptor set up that I do then the rear line from the engine is going to the “IN” port of the remote
oil filter adaptor.
Something else to check;
Check the adaptor that goes on the engine block. The brass looking sleeve that goes inside the black housing must be rotated in the correct position to insure proper
oil flow. before installing, I marked the outside of the large hexagonal brass looking bolt when the sleeve is in the correct position. I marked this position so that it was pointing to the center of the “in” and “out” holes of the black housing.