Decide the biggest Oil and burn it in Flamethrowerdefense

[Marv21]

Hello there,
sometimes i have to much of one Oil Product (Heavy/Light/Alkan) and instead of cracking it up i wanted to burn the oil that i have the most of in my defensive flamethrowers.
I created 3 decider which gave me the Output with the biggest value and controll three Pumps with it. But i cant connect them - You cant connect different fluids...
Is there a work around? I just hoped that after the pipe dried i could pump another fluid in (Pumps before every flamethrower).

[Serenity]

Flamethrowers don't consume enough to really make a dent in your supply

Maybe turn it into solid fuel instead

[Marv21]

Thanks, yes Solid Fuel is my Plan B right now.
Just thought it would be a cool solution .
In earlier Game versions, that was possible.