Cummins QSM Parts - Fuel Pump Section

Cummins QSM11 Fuel Pump System Components

The fuel pump system on the Cummins QSM11 engine is responsible for delivering a continuous, pressurized supply of fuel from the tank to the electronic unit injectors. Whether operating in a marine vessel, generator set, or industrial rig, maintaining reliable fuel delivery is essential for performance and uptime. Diesel Pro Power provides a wide range of aftermarket Cummins QSM11 fuel pump parts, including couplings, solenoids, filters, and shutdown valves—all engineered to meet the rigorous demands of QSM11 platforms.

Fuel Pump Coupling for Cummins QSM11

The fuel pump coupling connects the mechanical drive system to the gear-driven fuel pump, ensuring proper rotational engagement. Over time, wear or misalignment in this coupling can lead to inconsistent fuel delivery or complete pump disengagement.

Key Benefits:

• Precision-machined for accurate fitment
  
  

• Durable elastomer or steel construction
  
  

• Designed for long service life under vibration and heat exposure
  
  

When to Replace:

• During pump overhauls or fuel system rebuilds
  
  

• If there's excessive backlash or evidence of mechanical slippage
  
  

• When experiencing irregular fuel pressure at injectors
  
  

Fuel Shutoff Solenoids – 12V & 24V

The fuel shutoff solenoid is a critical safety and control device. It opens and closes the fuel supply to the engine, either in response to operator input or an automatic control system such as an ECM or emergency stop.

12-Volt Fuel Shutoff Solenoid

• Compatible with most QSM11 marine and mobile applications
  
  

• Used in systems where 12V electrical architecture is standard
  
  

• Seals tightly to prevent fuel bleed or leaks during shutdown
  
  

24-Volt Fuel Shutoff Solenoid

• Designed for high-voltage electrical systems (common in industrial gensets)
  
  

• Quick response actuation
  
  

• Suitable for continuous-duty cycles in commercial marine and power applications
  
  

Both versions provide reliable fuel control under harsh conditions and should be tested periodically to ensure safe engine operation.

Auxiliary Solenoids – 12V and 24V (Single Pole)

These compact single-pole solenoids support auxiliary functions, such as powering remote fuel valves or engaging secondary fuel systems. They are designed for seamless integration into QSM11 electrical harnesses and compatible with marine or industrial control setups.

Features:

• Durable contacts for high-current switching
  
  

• Corrosion-resistant housing
  
  

• Compatible with other Cummins platforms, including ISX, QSX, NH855, and NT855
  
  

Rectangular Seal Rings for Fuel Solenoids

The seal rings used in QSM11 solenoid installations prevent fuel and oil leakage around mounting flanges. Two are required per shutoff solenoid, and it's strongly recommended to replace them during any solenoid service or replacement.

Product Notes:

• Heat-resistant for long life in high-temp fuel environments
  
  

• Helps maintain system pressure integrity and avoids fuel seepage
  
  

• Compatible with multiple Cummins platforms, including QSM11, M11, ISM, and others
  
  

Cummins QSM11 Fuel Filters & Water Separators

Clean fuel is essential to the performance and longevity of the QSM11 injection system. Diesel Pro Power provides a full selection of spin-on fuel filters and combination fuel/water separator elements designed to fit QSM11 fuel systems.

Primary Spin-On Fuel Filters

Compact Fuel Filter

• Thread size: M16 x 1.5
  
  

• Compact size for space-restricted installations
  
  

• Removes fine particles and contaminants
  
  

High-Capacity Fuel Filter

• Thread size: 7/8" - 14 UNF
  
  

• Larger volume for extended service intervals
  
  

• Recommended for high-use or remote installations
  
  

Fuel/Water Separator Filters

The QSM11 is often deployed in marine and industrial settings where fuel water contamination is a concern. Water separators remove moisture from diesel fuel before it reaches the injection system, preventing corrosion and injector tip damage.

Fuel & Water Separator Features:

• Integrated spin-on design for easy replacement
  
  

• Threaded base: 1" - 14 UN
  
  

• Suitable for QSM11 marine and standby power applications
  
  

When to Replace:

• Every 250–500 operating hours
  
  

• At signs of fuel discoloration, low power, or injector knock
  
  

• As part of regular fuel system maintenance
  
  

Racor Replacement Fuel/Water Separator Systems

We also supply Racor-style aftermarket filters for larger fuel conditioning systems used alongside the Cummins QSM11. These multi-stage filters offer superior water separation and filtration in harsh marine or industrial environments.

Filter Housing Options:

• 500 series (compact)
  
  

• 900 series (mid-range)
  
  

• 1000 series (high-volume)
  
  

Each includes a compatible filter element and can be mounted inline between the tank and primary fuel pump.

Filter Element Micron Ratings:

• 2 Micron (Brown Top): Best for final-stage filtration
  
  

• 30 Micron (Red Top): Ideal for pre-filtration or dirty fuel conditions
  
  

Filter Element Sizes:

• 2010 series: Fits 500 housings
  
  

• 2040 series: Fits 900 housings
  
  

• 2020 series: Fits 1000 housings
  
  

Fuel Filter Wrench

Replacing fuel filters is easier with the correct tool. This adjustable fuel filter removal wrench fits filter diameters from 3-7/16" to 3-3/4", covering most QSM11-compatible filter sizes.

Highlights:

• Strong grip to avoid slippage
  
  

• Suitable for marine and mobile environments
  
  

• Prevents damage to filter housing during removal
  
  

Marine Fuel Cooler Zinc Anode

For Cummins QSM11 marine engines, a zinc anode helps protect the fuel cooler from galvanic corrosion. This small component plays a big role in extending the life of metal surfaces exposed to seawater.

Specifications:

• Brass NPT 3/8" plug
  
  

• Replaceable 1” zinc insert
  
  

• Easy to inspect and replace during service
  
  

Fuel System Pressure Switches

Monitoring fuel pressure is crucial for early detection of pump or filter issues. Diesel Pro Power offers make/break switches for various pressure thresholds, compatible with both fuel and oil systems.

Pressure Ratings Available:

• 5 PSI: Early warning or pre-start checks
  
  

• 10 PSI: Basic low-pressure alarm circuits
  
  

• 20 PSI: Used for mid-range pressure monitoring
  
  

• 27 PSI: Common in high-sensitivity marine control panels
  
  

Design:

• 1/8” NPT thread for standard fuel system ports
  
  

• Rugged construction with weather-resistant connectors
  
  

Tips for Maintaining QSM11 Fuel Pump and Delivery Systems

Maintaining proper fuel delivery ensures smooth operation and protects your injectors and ECM.

Fuel System Best Practices:

• Bleed the system after changing filters or fuel lines to avoid airlock
  
  

• Check solenoids regularly for proper actuation and electrical continuity
  
  

• Use the correct micron filter to protect injectors without overloading the fuel pump
  
  

• Inspect couplings for signs of misalignment or metal shavings