Fuel Pressure Low
The fuel system pressure is below the minimum required for proper injection. Low fuel pressure prevents adequate fuel delivery to the injectors, causing hard starting, loss of power, rough running, and potential engine stalling under load. Modern common-rail systems require precise fuel pressure for proper atomization.
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The most common cause is a restricted fuel filter. Fuel filters should be replaced at the manufacturer recommended intervals or sooner if fuel quality is poor.
Check for bubbles in clear fuel line sections, listen for sucking sounds at connections, and inspect all fittings on the suction side (tank to transfer pump) for tightness.
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