I'm about to re-install mine, The guy who rebuilt the pump told me to leave the key out and just let the nut/washer hold it in place. The engine is at top dead center and the pump is set there too so I shouldn't have a problem there. Anybody else ever leave out the key?
The key might not seem like its really doing anything but I wouldn't rely on just a nut and washer to hold the pump in place. take the extra time and throw the key back in.
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