I have a 90 FC N/A. After changing my oil a few days ago upon finishing and starting the car I looked at the OMP lines and noticed all but one line ( the line farthest to the left when looking at them head one) was pulling oil properly. I checked the delivery bolt on the OMP for the specific line to see if it had been clogged, but the passages were all clear. I also removed the UIM to check all the lines and they were connected properly as far as I could tell.

I'm stumped at this point and would really appreciate some input.

 

When you pulled the UIM, did you try blowing air through the injector? If it's clogged, oil may not flow up to it even.

 

Not the injector itself but I blew the line out. I'll have to check the injector. Thanks for pointing me in the right direction!