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I don't think that you should be able to pump fuel through the injection pump (other than through the pressure-relief valve which might vent back to the fuel tank). The injection pump controls the squirts to the injectors.
The MK relief valve is set to 20 psi (the electric supply pump keeps the supply system at this pressure - the pump delivers fuel up to 25 psi, and the excess 'spills' back into the fuel tank, together with the leakage from the (in-line) injection pump gallery).
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