Truck Repair: isc fuel lines, fuel leaks, support brackets

Question
i drive a 2002 kenworth with a cummins isc engine and it keeps getting fuel leaks at the ends of the lines. sometime where they connect to the head and other times where they connect to the pump, ive taken it to cummins and had lines replaced but that only lasts a couple days then i get the leaks back on the new lines. the mechanics at cummins here cant explain it.can you tell me anything?

Answer
They should NOT leak at all.Possibly the connector(tube that goes from line to injector)worn,the isolator clamps missing or loose.The lines are very thick and they will break because of vibration from the lines being loose.Also ccheck the support brackets to make  sure they both are tight.1 one the head & the one on block.