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The pump I found (Post #2) moves 12-15 LPM. I'm assuming that's liters per minute. That sounds like quite a bit without knowing exactly how much a vacuum wiper motor takes. I'll probably order the 6 volt one for my car and try it out and see. I won't use it full time but as a "booster" on a long climb in heavy rain or snow to keep the vacuum wipers going.