I am happy to report the PMOs are alive and the experience is a blast. Much better throttle response and the sounds are just heavenly. I did have a hiccup during the install as I found out my fuel pressure would not go any lower than 9 pounds no matter how I tried to adjust the PMO regulator. After consulting with Steve Weiner and Richard Parr, they both believed I had a kink in the return line. My options were to find the small kink, or replace the fuel pump with a lower pressure pump and re-plumb new fuel lines. Both of these options are very labor intensive jobs.
Well, my neighbor and fellow pelicanite came to the rescue. He believed the CIS pump just puts out way too much volume. The combination of the high flow volume and the resistance in the fuel hose due to natural bends and hose diameter creates the pressure to 9 pounds.
The aerospace engineer in him devised a plan to connect the flow and return line together through a ball valve. The idea of the ball valve is to be able to regulate the intake pressure as it comes in from the pump if necessary. A normal T fitting would work as well. Then plumb another line from the flow/return loop and connect a diaphragm regulator to it so the 9 pounds of pressure can be dialed down to an acceptable 3.5 pounds. From the regulator, the flow is fed into the PMO regulator and diverted out to the carbs. The return side of the PMO fuel block is plugged up as it is no longer used.
The idea was simple and it worked. We were then able to tune the carbs and get them synced up without the 9 pounds of pressure sinking the floats. I am now a very happy man and I hope this trick will help others who encounter excessive high pressures when converting from CIS to PMOs.
I also cut out some thick lexan for air filter covers. I think the beautiful venturies are too nice to be covered up under the metal rainshields.
