Injector lines

From my previous post about the leaking sensor under the fuel filter on a NH tl80 I found that it was infact a bad oring that I'm getting in the morning along with a new fuel filter bacause he said after replacing the sensor oring I would lose the diesel out of the lines so I figurd I might as wel replace the filter to while I had to bleed the lines. He told me how to bleed the lines by opening the small nut on top of the filter housing and said to crack the injector lines after the filter filled up. My question that I thought of after I hung up is how tight do I need to tighten the injector lines back to? Just snug or tight or something along those lines?
 
They have to be tight enough to not leak! Don"t put a cheater bar on your wrench but snug "em down tight. There might be a torque spec in the owners manual.
 

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