Fuel Shut Off Solenoid (For P7100 Pump) XD330 XDPRestore proper operation to your 1994 1998 Dodge 5. 9L Diesel with the XDP Fuel Shut Off Solenoid (For P7100 Pump) XD330. Your engine uses a fuel shutoff solenoid for start up and shut down. Over time, these solenoids can become damaged or stuck, from excessive heat, starter issues, or even a rotted boot causing a stuck shaft from exposure to the elements. In most of these conditions your truck won't start, or it's also possible that it won't turn