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    Why does the fuel pump of my 2009 Mitsubishi Triton buzz?

    Mitsubishi Mitsubishi Advice Mitsubishi Triton Mitsubishi Triton Advice Mitsubishi Triton 2009
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    The fuel pump of my 2009 Mitsubishi Triton makes a buzz for four seconds, even though the engine is not running.

    Answered by CarsGuide
    10 December 2024
    David Morley

    What you’re probably hearing is the pump switching on to prime the engine’s fuel system so that it starts easily and promptly. Even though the engine isn’t running, when you switch the ignition on, systems like the fuel pump all come to life to get things ready to be started and driven. When the pump has generated enough fuel pressure and volume to start the engine, it can then switch off and only switch on again once the engine is running and a constant supply of fuel is required. This could be why it only runs for a few seconds when you first turn the ignition on.

    This is pretty normal, but what isn’t is if the pump starts to make a new noise or the tone of its buzzing changes. At that point, what you might be hearing is wear or damage inside the pump.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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