The fuel system is one of the most critical assemblies on a Cummins engine, responsible for delivering precisely metered fuel to each cylinder at the correct pressure and timing. Components include fuel transfer pumps, high-pressure injection pumps, fuel injectors or nozzles, fuel supply and drain tubes, fuel manifolds, and fuel filters. On modern electronically controlled engines, the fuel system operates at very high pressures and is managed by the ECM to optimise combustion efficiency and emissions compliance. Even minor fuel system faults — a blocked filter, a leaking injector, or a worn transfer pump — can result in reduced engine power, increased fuel consumption, poor combustion, or failure to start. Sourcing correctly specified fuel system components is essential to maintain engine performance and avoid costly downstream damage.
AMS Parts supplies a wide range of fuel system components for Cummins engines used in power generation, marine, and industrial applications. Browse a selection of available parts below, or contact us for specific requirements.
Below is a selection of fuel system parts we supply. Use the search bar above to find a specific part number, or request a quote. You can also reach us directly at [email protected] or +44 7776 800169.
Fuel filter replacement intervals depend on the engine model, duty cycle, and fuel quality. Cummins generally recommends replacement at intervals specified in the engine operation and maintenance manual — typically between 250 and 500 service hours for many applications. Contaminated or poor-quality fuel may require shorter intervals.
Symptoms include rough running, misfiring, black or white exhaust smoke, loss of power, increased fuel consumption, and fault codes related to cylinder balance or injection timing. Injectors should be diagnosed using the appropriate Cummins electronic service tool before replacement.
Fuel injection components operate at extremely high pressures and tight tolerances. Non-genuine parts may not meet OEM specifications for spray pattern, pressure rating, or flow rate, which can affect combustion efficiency, emissions, and engine longevity. Genuine or OEM-approved components are recommended.
