I have a mission for arson fuel tanks of two of tanks if there is the possibility of setting
No, there isnt.
You can use legal skinmods which specialize on fuel or amo rack, try this one: http://worldof-tanks.com/hit-zones-of-fuel-tanks/
Hint: I did most of the StuG IV missions with V tanks, it is easy to make a KV1 or others burn.
I pity missions t-55a and I usually stay Aim