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I got the pump in today, it went pretty smooth. I threw the old pump back in got engine to 15° ATDC, removed it and got the tang lined up dead center on the new pump. It wouldn't stay so i took a bolt that fit snug in the hole and cut a slit dead center across it. How far should the shaft of the pump mesh into the splines on the sprocket? I felt it mesh and push in a bit but from the front side of the sprocket there is still at least 1/2" of splines showing. Just wanted to get a second opinion on that. Also i need help understanding the the routing and function of these fuel lines. Feed/ return etc...will i be able to make this work with the 606 filter housing? I looked at some diagrams but still cant find exactly how to route these lines to the 603 pump.