I have a tc25d, and its been great. I'm sorry to hear about your problem. Once you added more fuel, did you bleed the line? I ran out with the gauge reading a bit less than 1/4, and after adding fuel it wouldn't turn over but cranked and cranked. With a Diesel engine, you need to bleed the fuel pump (I think) and its easy to do, you just back out a nut at the pump and crank. Have a rag handy. You would need to do the same thing when replacing the fuel filter. Maybe someone else here can add greater detail. You also may have to bleed the injectors, but hopefully not. Both are outlined in the owners manual, but I'm sure you can find the info with some pictures on the Internet. If not, I can post a scan of the drawing from the manual. Let us all know how things work out.
My tc25d has been a champ-i have a woods backhoe on mine, and the only problem I've had so far is re-tightening the throttle handle linkage (great tutorial on this forum). Otherwise, we've been chugging along without incident. Also, my cruise control doesn't work, but rather than replace the switch, I don't worry about it. I don't need it.
Keep us posted.
Zan