It is not any kindo fault. If you have some exposure to old type fuel pumps, you must be familiar that when ever you change diesel filter, you had to operate a plunger type pump pushing up and down after opening few threads. Now a days model have auto system which ensures that there is no air/vapour lock of any kind in fuel pipe. when you turn on ignition key it operates a small pump inside fuel tank, which pumps up diesel in to fuel line, ensuring quick start of engine. I think that small pump is making kink sound when fuel pressure is reached to a certain pressure. To ensure yourself; observe that when ever the TASS guy drains diesel filter element, and fix back filter in place, you don't have to operate any manual push type plunger as in old cars. the system automatically push out any air by this pump. purging the fuel line with diesel.