Is there a way to definitively tell if it's good or bad? Oh and in case you haven't noticed I am no mechanic.
And I'm a shadetree mechanic... Not sure on that model but the service manual would have the test
worth the money if you don't have one. You'll need to pull a vacuum on it I'd guess. Since it's
a 2000 it might be time for it to get a little tlc.
They're not cheap that motor, I'd guess there is a rebuild kit Pump