The wagons are weird in that one pump is rear of the subframe near by the diff in the middle of the car and the other is under the cover on the right rear along with the filter. The pumps usually leak at the check valve fittings so I would make sure that there isn't a situation where tightening the fittings would resolve the problem. To tighten the check valve fittings you need to slack off the acorn nut sealing the banjo fitting before tightening the check valve fitting into the pump body. Counter hold the check valve, not the pump body, while tightening the acorn nut.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff