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A 35-year-old Universal M18 diesel engine fails to reach its rated 3200 RPM, topping out at 2700 RPM in neutral while stalling at low idle and producing black soot on the transom.0:14 Despite replacing injectors, fuel filters, and oil, and verifying compression is within specifications, the engine performance remains degraded.0:38 Nigel Calder suggests checking for hidden fuel restrictions, specifically a fouled filter screen on the fuel tank pickup tube, a clogged check valve on the primary fuel filter inlet, or a plugged filter screen inside the lift pump.1:37 If fuel delivery is confirmed, the mechanical governor may be fouled with internal sludge, preventing the flyweights from operating against the spring tension.3:09 Because the injection pump is expensive to service and requires precise retiming, inspecting the governor mechanism for stiffness or debris serves as a critical intermediate troubleshooting step.3:37 Black smoke and poor RPM response indicate a fuel-air ratio imbalance often caused by restricted flow or governor failure.

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