I finally got it running. The cause was the poor contact between the plug and the solenoid terminals. But the trouble shooting process is very interesting and lengthy before I got to this point. I really appreciated all the help I received from the forum.
As of yesterday after I replaced the blown 30A fuse in the Key Stop box near the battery, I got power to the stop solenoid wire. Tractor would crank but not start, thinking the solenoid is bad and needs to be replaced. I removed the solenoid from the tractor and called one dealer near me to see if they could test the solenoid and if it's bad I would have to buy a new one. I was told that the solenoid has to be tested while on the tractor. Called another dealer, the tech told me to bring it in. He put the power from the portable battery to each terminal of the solenoid, the shaft jumped quickly - the solenoid works fine. They told me to start the tractor without the solenoid. That's what I did- tractor started immediately, so the fuel pump, injection pump work fine, and no air in the system. That pointed the cause to the connection at the solenoid. I scraped, sanded the terminals of both the plug and solenoid, squirted some WD40 Rust Release then cleaned for good measure. The tractor started immediately.
I felt so good.
