Good evening, here is a related wiring diagram:
The shut off solenoid gets 12 volts from 2 places. Check to see if 12 volts is present at the light green and black wire with the ignition key in the start and run positions. The black and tan wire should show a good ground. The red and violet wire should have voltage when the starter is spinning. Here is more info from the dodge service manual:
NOTE: The fuel shutdown (shut-off) and fuel shutdown solenoid relay are not controlled by the powertrain control module (PCM)
Check these items and let me know what you find. Let me know if you need more help or have more questions.