This bundle provides the essential components for converting a 5.9 Cummins engine from a P7100 mechanical injection pump to a VE rotary injection pump. This swap is typically undertaken by experienced diesel mechanics looking to change engine characteristics or address specific performance requirements. The products collectively support the mechanical and fuel system modifications needed for this conversion.
Curated by The Shelf Curator · Updated June 2026
Built for 12-valve Cummins owners who need better low-end drivability and fuel economy than a P7100 allows. Not for competitive sled pullers or high-HP drag builds—this shop focuses on reliable daily operation and cold-start consistency.
Curator's pick: Diesel Fuel Pressure Gauge Kit
The rotary VE pump relies heavily on case pressure for timing advance, so flying blind is a mistake. This kit identifies lift pump failure before it starves the injection pump and causes a heat-related seizure.
⚠ Worth knowing: Reverting to a rotary pump requires the correct timing gear case housing; you cannot simply bolt the VE pump to a P-pump timing case without major oiling and alignment issues. Ensure your block surface is perfectly clean before swapping the housing to prevent persistent front-end oil leaks.
This VE Injection Pump serves as the core component for converting a 5.9 Cummins engine from a P-pump to a rotary injection system. It is designed for diesel mechanics seeking a different fuel delivery characteristic or replacement for a P-pump setup. It directly influences engine performance and emissions.
Rotary design for 5.9 Cummins
Mechanical fuel injection
Essential for P-pump conversion
Diesel fuel delivery
New or remanufactured options
In this shop: The VE Injection Pump is central to heavy-duty diesel mechanical engineering, directly enabling the P-pump to rotary pump conversion.
The VE Injection Pump Gear is a critical component for properly driving a rotary injection pump on a 5.9 Cummins engine. It is specifically designed to mesh with the camshaft and rotary pump, ensuring correct timing and operation. This gear is essential for mechanics undertaking a P-pump to rotary pump conversion.
Specific to VE rotary pumps
Engine timing component
Durable steel construction
Direct drive gear
Engine camshaft interface
In this shop: The VE Injection Pump Gear facilitates the precise mechanical operation crucial to heavy-duty diesel mechanical engineering.
Rotary High Pressure Fuel Lines are designed to connect the VE rotary injection pump to the engine's injectors. These lines have specific fittings, lengths, and routing tailored to the rotary pump configuration, differing from P-pump lines. They are necessary for proper fuel delivery in a converted system.
High-pressure fuel delivery
Specific to VE rotary pumps
Durable steel construction
Correct fitting types
Engine injector connection
In this shop: These fuel lines are a foundational part of the fuel system, fitting the heavy-duty diesel mechanical engineering theme by ensuring precise fuel delivery.
The Injection Pump Mounting Bracket provides secure support for the VE rotary injection pump on the engine block. This bracket is specifically designed for the rotary pump's dimensions and mounting points, ensuring stability and alignment. It is required for a safe and functional P-pump to rotary pump swap.
VE pump specific design
Engine block mounting
High-strength metal
Secures pump in place
Prevents vibration damage
In this shop: This durable bracket embodies the heavy-duty diesel mechanical engineering ethos by providing robust support for essential engine components.
The Throttle Linkage Assembly connects the accelerator pedal to the VE rotary injection pump, controlling engine speed. Its geometry is unique to the rotary pump, requiring specific components for proper functionality. This assembly is vital for any P-pump to rotary pump conversion to ensure throttle response.
VE pump specific linkage
Mechanical throttle control
Durable metal construction
Engine RPM adjustment
Accelerator pedal connection
In this shop: This assembly is designed for the precise control expected in heavy-duty diesel mechanical engineering applications.
The Timing Gear Case Housing covers and protects the engine's timing gears, including the injection pump gear. A specific housing may be necessary for a P-pump to rotary pump conversion to accommodate the VE pump's bolt pattern and integrate correctly with the engine. It ensures proper gear alignment and protection.
Specific VE pump bolt pattern
Protects timing gears
Durable cast aluminum/iron
Engine front cover
Maintains oil integrity
In this shop: This housing is key to the structural integrity and functionality required in heavy-duty diesel mechanical engineering projects.
A Diesel Fuel Pressure Gauge Kit provides real-time monitoring of fuel pressure in the system. This kit is essential after an injection pump swap to verify correct fuel delivery and identify potential issues. It helps mechanics ensure the engine is receiving adequate and consistent fuel pressure.
Monitors diesel fuel pressure
Analog or digital gauge
Includes sender and lines
Post-swap system verification
Ensures correct psi
In this shop: This diagnostic tool is crucial for the meticulous tuning and verification characteristic of heavy-duty diesel mechanical engineering.
