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Check Diesel Fuel Supply Leak

Model: Renault Megane Megane 1 - Years 1995-2003
Part: Checks and maintenance

If the engine struggles to start, especially when cold, and runs unevenly once started, there may be a problem with low pressure in the diesel fuel supply system caused by a leak. To detect the leak, increase the pressure in the fuel supply system using the manual pump near the fuel filter: repeatedly press the pumping element until it resists and check the fuel lines; you can also disconnect the pump pipe and blow air at 1 bar using a compressor.

Updated on 12 February 2026 by ScegliAuto

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