I would have to suspect a wiring connection got disturbed (maybe a brittle wiring harness just decided to die!) during the water pump installation. Is the crankshaft position sensor or camshaft position sensor or harness anywhere near the water pump? Could a vacuum hose got knocked off. An engine needs mechanical integrity, spark and fuel to start. Do you have spark and fuel pressure?
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Thanks for responding. I have checked the things that you mentioned and it doesn't seem to be any of those.I also forgot to mention that I had washed off the motor in the area of the water pump. Do you suppose that could have anything to do with it? And, if so, how and what would get wet. I thought everything was pretty much sealed.