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Could it be the eccentric on the end of the cam? But keep in mind the pump mounts in the timing cover also, still could be that chain but IIRC the eccentric can be damaged by putting te pump in wrong. Id pop the timing cover off and take a look
What is the eccentric used for on an EFI motor? I just rebuilt my motor and it had the mechanical fuel pump eccentric installed, but I have an electric fuel pump. Im confused about why it is needed. Is it for balancing the camshaft or something?
