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there are two marks.. one in the pump itself.. and another in the flywheel. you stand up in the side of the fuel pump to find the flywheel mark.. there are two holes,,, one of about 1 inch diameter and a smaller one of 3/8 inch.... sometimes there isa plastic cork that covers the bigger hole and is attached to the smaller hole... remove it completely... insert a bolt or a screwdriver in the smaller hole..don't pay attention to the bigger one... then with a socket or a wrench turn the damper clockwise until you find the hole in the flywheel.. now you go to the fuel pump that of course is not installed yet..with an allen key, you proceed to open a plug that is located a little lower from the fuel return line... once you remove the plug, turn the pump's rotor until you find inside the hole, a flat surface.. that's the mark ... there is a special tool to keep it in place.. or you can use a bolt that fits properly inside there..... then you install the pump and that's it

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