It is the pump driveshaft that shears/breaks when the head and rotor seize, there is an area machined down to a smaller diameter on the shaft that acts as a sort of mechanical fuse so it breaks there instead of tearing up the timing gears.
When you first wrote about this I didn't realize what type of I.P. you were working with that has an INTERNAL shutoff solenoid.
You SHOULD be able to hear the solenoid click and parts move inside the pump when power is applied even IF there's other damage to the pump.
Try this... remove wire from shutdown solenoid and connect an unpowered 12 Volt test light to a source of battery power and touch the probe to the shutdown solenoid terminal. The light should illuminate proving the solenoid coil is intact.
If that checks out the solenoid could still be mechanically stuck.
The way the system works is that a spring is constantly trying to move an arm that pushes the metering valve linkage to the no fuel position.
When the solenoid works as intended it counteracts the spring and pulls the arm back away from the metering valve linkage allowing it to open.
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