It is normal for the pump to make a quiet hum, but not a buzzing. It may be going bad. When the vehicle doesn't start, that is when you need to check fuel pump pressure. Here is a how to:
https://www.2carpros.com/dia/test_fuel_pressure.htm
If you don't have a gauge, many parts stores will rent them. If you can't find one, they sell them at the test equipment store site on this page.
Let me know what you find.
Joe
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Friday, March 20th, 2009 AT 3:47 PM