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    2005 Mazda B2500 motor turns over but won't start

    Mazda Mazda Advice Mazda B2500 Mazda B2500 Advice Mazda B2500 2005
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    My 2005 Mazda B2500 motor keeps turning over but won't start.

    Answered by CarsGuide
    9 April 2025
    David Morley

    This is a relatively simple diesel engine you’re dealing with here, so the first thing to check is the fuel supply. A dud or worn out fuel pump can mean the engine isn’t getting any fuel to the injectors, at which point it will never fire up. Even if you had a single injector playing up, you’d expect at least the odd cough from the engine as it tried to start on three cylinders, but from your description, there’s nothing going on under that bonnet.

    The other common thing that stops a diesel starting is non-functioning glow plugs. These are designed to pre-heat the combustion chamber so that the fuel burns when it’s compressed by the pistons (a diesel has no spark plugs, remember). Without this pre-heating process, the fuel may refuse to ignite and the engine won’t fire. But don’t rule out the simple stuff like a blocked fuel filter that is preventing the fuel flowing from the tank to the injectors. A split or damaged fuel pick-up inside the tank can also lead to a lack of fuel at the engine, as can an air leak anywhere along the fuel line.

    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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