HI sir, I own an L400 spacegear and its been working well. My question is not with my vehicle but what I saw with the new adventure. I saw the injection pump has this thing, as i really don't know what it was na nakakabit sa side ng injection pump. mayoon syang nkakabit na hose coming from the cooling system which means from the side of the engine to the injection pump. Can you tell me sir Dieseldude kung para saan ito. Does it has to do with putting the fuel temperature higher so it will burn effeciently and have alesser emission of smoke?

Thanks in advance.