I did confirm that the soln'd that I'm delivering power to is the fuel cut off. So, sounding more like it could be air in the system.

I had primed the fuel system up to the fuel filter, but there would have been air in the line between the fuel filter and the injector pump. So maybe that was drawn into the injection system. I had assumed it would have been sent back out the return line, but maybe that assumption was in error. Anyone agree/disagree with that assesment?

Thanks again.

Paul