Quote Originally Posted by Ross
There are two O-rings on each injector, one at the fuel rail and another at the head.
Remove the fuel rail and do them all, they are cheap.
Better yet send the injectors out for ultrasonic cleaning and "refurbishing" which will get you clean injectors, a fresh screen in each and new O-rings.
mine doesnt have a rail its a old diesel just have the main pump with pipes leading off to the injectors