Expert: Skip Bollinger - 2/6/2010

Question
I've done everything and I can't seem to get any oil.  Not sure if its the pump, it was replaced once.

Answer
Chuck,
  Please remember as noted in my Profile, I'm a Parts Specialist, NOT a tech but will offer some thoughts for your consideration..
  I have been on the Parts Counter for 36 years. I have only seen this happen once but if it can happen once, it can happen again. That was the oil filter coming apart internally and becoming occluded, preventing oil flow. Unfortunately it was installed on a $50,000 drag race engine!! It ruined the crankshaft and bearings and the cam and it's bearings so the repair wasn't as expensive as a complete engine.
  My second and last thought is an oil bypass valve (IF your engine has one). I'm not that familiar with your engine. Nissan should be able to tell you if it does have one.
  I hope this may help a bit. Good luck.
Skip
P.S. This goes without saying it could be the obvious Oil Pump but you stated it had been replaced.