Found another spare it is a good idea to carry. Water In Fuel Drane Valve. Either a complete valve or a repair kit. Mine is a '01 CTD and the o ring failed at 100K. Not just a little drip, a steady stream. Not expensive and you will need a number 15 Torx.
'01 Dodge 3500 CTD, Lance 1121, Air Bags, Rancho 9000, All Wheels Under Power When Needed, A Few Engine Mods For Increased HP
Burning Grease, 800 ft/lbs. of torque from something you throw away.