Is there any security senser's on the DB 990 implematic?

She has been having fuel accelarations on and off for no reson, then as I was working her,stop's..dead, with still three inches for fuel left,??? I added more,had to bled it more(on top),started,but has done again and wont start,diesel is getting up to four cylinders. Filters are clean,have put new fuel in.
Well dam,it's are only tractor,I love her!
Should I talk more?