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Make sure you have clean fuel filters..... a B model Mack of mine woke up when she was running without an inch and a half of coffee grounds up the side of the filter.She went from no smoke to a light brown on acceleration. Mark

Truck garages used to have a tinted glass "ruler" that had various shades of brown to black and was used to set pump output screw from the diesel trucks exhaust color. B Model Mack operator/ mechanic reported that trucks can stand about a foot of fire out the stack on a hard pull but turning up...