The fuel system stores, filters, pressurises and delivers fuel to the combustion chamber at the right moment and in the right quantity. This group covers injectors and injector sleeves, high-pressure and transfer pumps, fuel rails, filters and water separators, priming pumps, and low-pressure lines. CAT has used several injection architectures across its range, including mechanical unit injectors, electronic unit injectors (EUI) on the 3406E and C-series, and common rail on newer platforms, so the correct parts depend heavily on the engine serial number rather than the model designation. Fuel contamination remains the dominant cause of injector and pump failure, which is why water separator condition matters as much as the filter itself.
AMS Parts supplies a wide range of fuel system components for CAT engines used in power generation, marine, and industrial applications. Browse the full range below, or contact us for specific requirements.
Browse our range of Fuel System parts below. Use the search bar above to find a specific part number, or request a quote.
CAT has used mechanical unit injectors, electronic unit injectors and common rail across different platforms and build years. The engine serial number identifies which system is fitted.
Many can be overhauled and flow-tested by a specialist. Testing is essential because fuelling must be matched across the set for even running and correct emissions behaviour.
Water destroys the lubricating film that high-pressure fuel components rely on, causing rapid wear and seizure. Draining water separators on schedule is the main defence.
