It needs to be removed from the bottom. It's held on by what GM cars scrivets, the little plastic rivet things with removal accomplished by pulling out the center round piece and then pulling whole scrivet out. There are 4 of them, 2 on top, 2 on the bottom to remove. Do the 2 on top, jack car up, put jack stand under car, remove splash shield, unhook wiring from pump, unhook hose, remove last 2 scrivets, lower washer tank.
Personally, I would rather take a trip to the dentist then mess with those scrivets. But maybe you'll get lucky and they will pull right out.
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