Ok, first off, thank you for all the replies so far. I do have the air cleaner off.
I'm wondering: As an updraft, it may be expelling gas that isn't needed in a normal way... maybe. In other words, the same thing happens maybe, with down drafts and the gas just flows into the intake... maybe. But back to electrical, I found that the little switch that sits on top of the starter has intermittent power loss because it is loose. I also notice that none of my other cabover trucks have this switch. Do I need it and what is its purpose? This is likely my problem. The starter linkage activates it. The process of activation causes a bad connection. As luck would have it, when I have been testing for proper current, it was good, but it wasn't consistently good, and was dropping current, not just losing it completely. I finally caught it with low current. This was happening, evidently, every time I would try to start the truck. Maybe I'm close to getting this thing going.
