Same thing happened to me have a 99 CTD had a new lift pump on the truck 2 months old and good fuel pressure, driving along and it just stopped. No codes no check engine light just stopped like it was out of fuel but it wasn't.

Truck had 150K when that happened, changed out VP44 and its been great since. Got lucky on the VP44 friend that works for Mopar checked stock when Mopar was closing dealerships around 07/08??? He found one on the shelf for my truck and one for his so I did have one on the shelf.

Betting on the VP44............Good Luck.