[Richard]

If it were me, I would reinstall the control box. Put my voltmeter on the leads to the fuel solenoid and see what the voltage is when cranking.

I would then reattach the leads to the solenoid with it removed from the engine and see how it moves. The reason I suggest this is it is very easy to adjust the solenoid so it will not hold. Adjusting the slack in the rod is counterintuitive. If it’s not pulling in, my thought was to adjust it to pull even more, when in fact I need to put some slack into the setup to allow the magnets to engage the slug in the solenoid.