Cummins 6BT Fuel System Parts Catalog

The Cummins 6BT 5.9L is one of the most widely recognized diesel engines in the world, powering commercial vessels, industrial equipment, and generator sets for decades. A major reason for its durability and reliability is its straightforward yet highly effective fuel system. Maintaining the proper operation of fuel pumps, injectors, filters, and related components is critical to ensuring long engine life, consistent power output, and dependable performance in both marine and industrial environments.

Below you’ll find an in-depth catalog of Cummins 6BT fuel system parts, including transfer pumps, filters, solenoids, fuel supply tubes, pressure switches, and accessories. Each component plays a vital role in moving, filtering, and delivering fuel to the combustion chamber, and Diesel Pro Power makes sourcing these parts simple with fast worldwide shipping and trusted customer service for over 40,000 satisfied customers.

Fuel Transfer Pumps for Cummins 6BT

Fuel transfer pumps are at the heart of the Cummins 6BT fuel system. They ensure a consistent supply of clean diesel fuel from the tank to the injection system. A properly functioning transfer pump prevents cavitation, protects injectors, and ensures optimal combustion efficiency.

Mechanical Lever Style Transfer Pump

The classic lever-style mechanical fuel pump is widely used in 4BT and 6BT engines. This design provides dependable, mechanical actuation and is a favorite in rugged industrial and marine applications where simplicity is key. Operators value this pump because it requires minimal electronics, reducing points of failure in harsh working environments.

Mechanical Piston Transfer Pump for Rotary Pumps

For Cummins engines equipped with rotary fuel injection pumps, the piston-style transfer pump offers efficient fuel delivery with smooth operation. It is engineered to maintain steady pressure to the injection system, preventing fuel starvation and ensuring consistent engine operation.

Mechanical Piston Transfer Pump for Non-Rotary Pumps

Non-rotary injection systems require a piston pump variant specifically designed for consistent high-volume delivery. This ensures that engines with different pump configurations always receive the proper flow rate, making it critical to match the pump style to the injection setup of the engine.

Fuel Transfer Pump Gaskets

Every fuel pump installation requires high-quality gaskets to prevent leaks and ensure long-lasting performance. Cummins 6BT transfer pump gaskets are designed to withstand diesel exposure and maintain a tight seal, minimizing the risk of fuel seepage that could compromise efficiency.

Fuel Filters and Water Separators for Cummins 6BT

Clean fuel is vital for engine performance, and the Cummins 6BT relies on spin-on style fuel filters and water separators to keep contaminants out of the injection system. Modern diesel often contains small amounts of water, dirt, or particulates, all of which can cause severe injector damage if not filtered properly.

Standard Spin-On Fuel Filters

Several filter sizes are available for the 6BT depending on the application, each with carefully engineered flow rates and filtration media. These spin-on filters are designed for quick service changes while providing reliable particle separation to extend injector life.

Water Separator Fuel Filters

Marine and industrial environments often expose engines to fuel contamination from condensation, poor storage, or marine growth. Water separator filters combine high-efficiency filtration with water separation, ensuring that only clean diesel reaches the engine. They feature drain valves or serviceable elements to remove trapped water before it enters the system.

Racor Fuel & Water Separator Systems

For operators requiring additional protection, Racor filter systems are available in multiple sizes (500, 900, and 1000 series). These are widely used in marine applications where water contamination is common. Replacement elements are available in different micron ratings, such as 2-micron brown tops for ultra-fine filtration and 30-micron red tops for primary filtration. Using the proper element ensures optimal flow and engine protection based on the application.

Injector Fuel Supply Tubes

The Cummins 6BT uses durable fuel supply tubes that deliver precise amounts of diesel to each injector. Designed to handle high pressure and vibration, these tubes must be kept in excellent condition to prevent leaks or disruptions in fuel delivery.

Supply Tube Sets

Injector fuel supply tube sets are available in configurations for cylinders 1–3 and 4–6. These are typically supplied for industrial and truck applications but are also compatible with marine configurations when specified. Ensuring all tubes are free of cracks, wear, or corrosion is essential for consistent injector performance.

Fuel Pump Solenoids

Solenoids control the on/off fuel flow to the injection system. On Cummins 6BT engines, they are used to shut off the fuel supply when the engine is stopped, ensuring safe operation and preventing run-on.

• 12-Volt Solenoid – Common in most smaller generator sets and marine installations.

• 24-Volt Solenoid – Used in larger industrial and commercial equipment where a 24-volt system is standard.

A faulty solenoid can cause no-start conditions or difficulty shutting down the engine, making it a critical component of the fuel system.

Fuel Cooler Hoses and Marine Applications

Marine variants of the Cummins 6BT often include a fuel cooler to help regulate diesel temperature and maintain proper viscosity. Molded hoses designed for inlet and outlet connections ensure reliable coolant flow through the cooler. These hoses are engineered for flexibility, heat resistance, and long service life in marine environments.

Additionally, zinc anodes are available for Cummins marine fuel and oil coolers. These sacrificial anodes protect the cooler from galvanic corrosion, extending its service life in saltwater environments. Replacing zincs on a regular maintenance schedule is essential for any vessel operating in seawater.

Pressure Switches

Fuel and oil pressure switches serve as vital safety components in Cummins 6BT systems. They monitor pressure levels and provide signals to alarms or shutdown systems when readings fall outside safe ranges. Available in multiple PSI ratings (5, 10, 20, and 27 PSI), these switches help prevent catastrophic engine damage by shutting the engine down in low-pressure conditions.

Fuel Filter Tools & Accessories

Servicing Cummins 6BT fuel filters is simplified with the proper tools. A fuel filter removal wrench allows technicians to easily remove spin-on filters without damaging the housing. Maintaining the correct service tools ensures quick, efficient filter changes, reducing downtime and preventing accidental damage.

Gauges for Monitoring Fuel and Oil Systems

In addition to switches, gauges provide operators with real-time feedback on system performance. Cummins 6BT applications support both mechanical and electrical gauges for pressure monitoring.

• Mechanical Gauges – Simple, reliable, and ideal for direct engine installations.

• Electrical Gauges (12V & 24V) – Provide remote monitoring capability from a control panel or wheelhouse.

Monitoring systems ensure that fuel pressure and oil pressure remain within proper operating ranges, helping operators detect issues before they become failures.

Why Choose Diesel Pro Power for Cummins 6BT Fuel System Parts?

When it comes to sourcing replacement parts for the Cummins 6BT, quality and reliability matter. Diesel Pro Power provides:

• Worldwide Shipping – Fast delivery to over 180 countries.

• 40,000+ Satisfied Customers – Trusted by operators around the globe.

• Comprehensive Inventory – From transfer pumps and filters to gauges and solenoids.

• Expert Support – Our team helps ensure you find the right part for your specific application.