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94swguy
08-27-2009, 08:39 PM
what is it that buzzes when you turn the key - fuel pump or sending unit?

admin
08-27-2009, 09:10 PM
Hi 94swguy,

That would be the fuel pump. It comes on for a couple of seconds when you turn the ignition key to the On position, which pressurizes the fuel system. When you crank the engine, the PCM receives reference pulses from the crankshaft position sensor, and then turns the pump on again. It stays on until you turn the engine off.

The sending unit is for the fuel level gauge; it doesn't make any noise.