I'm not Roy,but I can tell you two sources of leaks I've had on top of my 6.9. There are little rubber caps at the end of the fuel return line and more important,those plastic caps on top of the injectors where the return lines hook up,there are two o-rings inside each one. Slide the clamps on those little rubber hoses to the center then turn those caps to get the hoses off.You'll have to take the injector lines off. Now they just snap right up off of there. On mine,those o-rings had worn flat. Slid new ones down on there,snapped the caps back on,hooked up the hoses and lines and that was it.
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