Do you have an oil filter installed? If so, it should t (oil line and pressure line). I have had krud develop there. I left the filter but blocked the motor. Dont really need a filter but looks cool. The other thing I have had, is there is a soldered-in oil pipe out of the housing the oil pump connects to. I thought the pump was bad but the pipe had dislodged slightly lowering the pressure to almost nothing. New gasket and painted pan, good pressure also.
