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May I ask? What is a plunger on a CUCV?

I must admit I know about as much about electrical items as I do about brain surgery. So I am not going to try and BS you. I know enough to get by and that is all I ever needed. I have a few good test lights and a Fluke meter. All I ever needed. So you know more then me about electric if you can...

? that is hard to diagnose from afar. I have no idea of any wires that may be chaffed or changed. That is all I know without a look see. Sounds simple enough.

Could be. I would also just add a ground to the pump and see if that helps it. I have several added grounds on my vehicles. Engine block to frame and frame to core support on both sides and a few extras to the buss bar and firewall. I think I have the grounding covered. I did it to stop slight...

IMHO you may have had a piece of dirt of what I call a fluke. I had one do it to me and I just did the disconnect and light tapping. I put a QT of ATF in it and ran it. Never done it again. Is this one that has been sitting around and seldom driven by chance?

The red wire will disconnect the 12 volts to the pump. It should shut the engine off immediately when the power is disconnected. If not the LIGHT tapping will jar the switch and help close the valve. I hope that helps. This may be an intermittent failure and it may shut off normally everyday...

Simple to diagnose that. Disconnect the red wire at the injection pump.

Turn the key off and tap on the top of the injection pump. Tap lightly.