I have here an interesting situation (at least to me it is). I have been having a problem with my car on cold starts but hadn't really had much time lately to mess with it. Well today I had a little time and was feeling frisky. The car is an 1989 iroc-z with the 350 tpi stock. anyway, I did what the service manual tells you to do in their diagnostic chart. Came to the part where you put the fuel pressure gage on the rail and check for pressure, turned ignition on without starting and pressure went to 47. It then dropped to 40 for about 10 seconds and then slowly dropped over a period of about one minute to 18 psi where it stayed. Now here is where it gets interesting! Before I was about to go tearing the plenum off and checking for a leaking injector, I decided to pinch off the fuel return line and check for a possible leaking fuel pressure regulator. After I pinched off the return line, I turned the ignition on without starting and surprise, no pressure. Turned ignition off, removed the clamp and did the igniton thing again. I had pressure this time. Was positive that I had pinched off the return line, went back to the service manual and checked it, looked at the lines, re-checked the book and sure enough. I had pinched off what was supposed to be the fuel return line but must have been crossed with the pressure line somewhere before I bought the car. My question is this, is it possible for the car to run with the lines crossed like this or do I have a gremlin following me around?