How do I determine if the fuel pump is working?

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After freezing night started up easily, drove to station (10 min.), Temp. gage shot from cold to overheat just as I pulled to pump. Shut off, pumped gas, tried to start, turned over easily but no fire. Towed home, drained water and oil - no water in oil or oil in water. Removed plugs and found moisture on 3. Changed plugs & oil, tried to start - no fire again??