I have a 93 5.0 and can't get the fuel pressure above 22 lbs. I have put on a new adjustable pressure regulator, new filter, new fuel pump. I have a permanent gauge on the fuel rail. Before the fuel pump was change, we checked the pressure coming right out of the pump. No higher than 22 lbs. With new pump, pressure still no higher than 22 lbs (at the rail). This happens no matter how many times we cycle the pump. Any ideas? Thanks.