High pressure Fuel pump oring question

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nomis88

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Jun 22, 2022
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Bend, OR
Quick question on HPFP install. I bought a used xdi pump and got new hardware/orings.

Does an oring go into the mounting hole above the tappet? There seems to be a slot for it but when scrubbing install videos sometimes I see an oring in that spot and sometimes I don’t see one

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