it says it all on the tin here! now, you may ask WHY? well as it is the ONLY 2 ways you can use non-base line fuels with M240-T is be waiting to used up all your fuel on tank then filling it up. OR taking off your Broiler-T refueling system and just using the M240-T like a normal flamer.
This is just really janky and prevents Pyros using super fuel effectively you ether need to get lucky not have the lab and OT fill fuel tank for you and just bring down large rolling reagent tank so you can fill you empty fuel tanks or just having to lower your flexibility and discard your Broiler-T pack.