scott,

Thanks for the wisdom. I am not sure I fully understand, so I will ask some more questions.

1. Both cars only have less than 50K, so all the fuel lines are clear, can see the fuel and air bubles traveling through the lines.
2. The only O-Ring I see is where the fuel line sits on top of the pre-filter. While I do not have a new O-Ring, I am not certain, but the seal at this point seems good, I can hardly pull the hose out of the top once it is seated into the pre-filter. It appears to be very tight, though I will try to procure a new O-Ring, at this point will try anything, can not hurt.
3. I have also tried cracking open the front 3 injectors since these are faily painless to get to. Got the car running, and left injector off until fuel was pumping out like it should, then tightened back up. This usually works to blead air out of my big tractors and other diesel trucks, but has not seemed to help in this case.
4. I have never touched the fuel shut off valve or hose, so not sure about that, but will check it out.

If you think of anything else, please advise, definatly appreciate any help.

Thanks,