Subaru Robin PKX201 - Manual (Page 84)

High Pressure Pumps - PKX Service
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37. Re-tighten the impeller with a rubber mallet hitting
the blades in a clockwise position. It should be tight
enough that you should not be able to turn it loose
by hand.
39. Re-install the volute into the outer case making sure
the slot in the volute is resting on the casting
molded into the outer case.
38. It is important that the volute slot matches with the
cast in notch in the outer pump case. See arrow.
40. Replace the cover and volute onto the pump back
plate. Install the four outer pump case bolts.