DARKY
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IIRC , Fuel tanks are cylindrical vessels like in this picture .
What I was asking was about that rectangular box behind the tank.
That Rectangular box contains APU [Auxiliary Power Unit] which helps in keeping the electronics in the Arjun working without turning the engine on... hence saving a lot of fuel and providing stealth [reduced infrared signature]... During a whole day in a Battle the MBTs hardly go beyond 100-80km... most of the time they remain stationary or in Ambush etc... they have to keep their engines running for their electronics to work consuming a lot of fuel and giving away the position due to IR signature and smoke etc... Most western tanks have APU to overcome such drawbacks... even T-90MS have them in the rear part of chassis It is an integral part of modern day MBT... however you won't find them in Chinese MBTs.... even our T-90S Bheeshma don't have them.