there is no secrete in the pump HP. locate and Remove the plate at the back of the fuel pump held on by four scews, two of which will have safety wire. I do not think you have to worry about warranty. 10MM wrench _ socket. You will lose about 1_4 cup of oil, catch it. locate the jam nut on the slot headed black screw and losen the jam nut with the same 10MM wrench while holding the screw with a flat screwdriver. Then turn IN the screw 3_4 turn. Set the jam nut snug but do not overtighten and replace end cover. You will need no gasket as it is oring sealed.