[trit21]

Pre-heaters are not required to run or start. As a matter of fact I have disabled mine and dont' run them as the only thing they do is put a strain on the charging system. It sounds like the fuel solenoid may be closing which in turn will shut the engine down, actually this is how the engine is shut down. If you batteries are not being charged, the solenoid will not stay open and will shut down the engine. You can try to tie the fuel solenoid open to see if it continues to run after you release the start but it sounds like the charging system has a fault someplace since the batteries are not being charged. You say the preheat was not working? How did you know it was not working and how did you fix that. PreHeaters take up an enormous amount of current and will suck a battery down quickly. I would disable the preheater and run without until you find the other problems first.