And as the fuel pump flange is tightened against the block, the lever fits up aligned against the retracted push rod. If the cam lobe was holding the push rod out a little bit, you would have to depress the pump lever arm a little as it goes tight against the block. That can be done but it makes aligning and starting the bolts harder. Better to get the push rod all the way in on the base circle of the cam. Note that I am just holding the pump aginst the block.
As the engine rotates, the cam lobe pushes the rod out against the lever that pumps the fuel. As the engine continues to rotate the spring in the fuel pump pushes on the lever which pushes the rod back up to the base circle of the cam, until the lobe comes around again, and pushes the rod out against the lever again, and on, and on, and . . .
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