WATERAX DIESEL FIRE PUMPS
Professional-grade diesel pumps powered by the Kubota D902 25 HP engine. Choose high-pressure (395 PSI) for long hose lays or high-volume (310 GPM) for WUI operations. USFS Type 6 listed.
Kubota-Powered Performance
WATERAX diesel pumps combine proven pump technology with the reliable Kubota D902-E4B engine for demanding vehicle-mounted applications. The liquid-cooled 3-cylinder diesel delivers 24.8 HP with exceptional fuel efficiency and the durability apparatus builders trust.
Two pump series are available: the BB-4-D902 delivers high-pressure performance up to 395 PSI for long hose lays and high-elevation firefighting, while the B2X-D902 provides high-volume output up to 310 GPM for wildland-urban interface operations and rapid water transfer.
Both series feature the WATERAX quick-release clamp system, maintenance-free sealed bearings, and 14-pin FastWire connectivity for seamless integration with control panels. EPA, CARB, and CE emissions certified.
Why Choose Diesel?
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Superior Fuel Efficiency
Diesel engines consume 30-40% less fuel than gasoline equivalents at comparable power output. Lower operating costs over the life of your apparatus.
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Fleet Fuel Compatibility
Run the same ultra-low sulfur diesel as your apparatus chassis. Simplify logistics with single-fuel operations and eliminate gasoline storage requirements.
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Liquid-Cooled Durability
The Kubota D902's liquid cooling system maintains optimal operating temperature during extended pumping operations that would overheat air-cooled engines.
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Reduced Maintenance
No spark plugs, no carburetor, no ignition timing issues. Fuel injection provides reliable cold starts and consistent performance in all conditions.
Choose Your Diesel Pump Series
Both diesel series share the same Kubota D902-E4B engine but pair it with different pump ends for distinct performance characteristics.
BB-4-D902: High-Pressure 4-Stage
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BB-4-D902 Performance
Maximum Pressure: 395 PSI (27.2 BAR)
Maximum Flow: 106 GPM (401 L/min)
Maximum Head: 911 ft (278 m)
Pump Type: 4-stage centrifugal
Max Allowable: 600 PSI (41.4 BAR) -
BB-4-D902 Flow at Pressure
At 150 PSI: 103 GPM (390 L/min)
At 250 PSI: 95 GPM (360 L/min)
At 350 PSI: 55 GPM (208 L/min) -
BB-4-D902 Best For
Shop BB-4 DieselLong hose lays, high-elevation firefighting, tandem pumping, parallel pumping, direct attack, sprinkler systems, Type 6 brush trucks. USFS Type 6 Fire Apparatus listed.
B2X-D902: High-Volume 2-Stage
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B2X-D902 Performance
Maximum Pressure: 180 PSI (12.4 BAR)
Maximum Flow: 310 GPM (1173 L/min)
Maximum Head: 415 ft (127 m)
Pump Type: 2-stage centrifugal
Max Allowable: 400 PSI (27.6 BAR) -
B2X-D902 Flow at Pressure
At 50 PSI: 274 GPM (1037 L/min)
At 100 PSI: 220 GPM (833 L/min)
At 150 PSI: 112 GPM (424 L/min) -
B2X-D902 Best For
Shop B2X DieselWildland-urban interface, dual attack lines, booster reels, high-volume water transfer, tank filling, structure protection. Ideal for initial attack units and brush trucks.
Kubota D902-E4B Engine
Both diesel pump series are powered by the same proven Kubota engine.
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Power Output
Net Power: 24.8 HP (18.5 kW) @ 3600 RPM
Net Torque: 40.6 lb-ft (55 Nm) @ 2600 RPM
Idle Speed: 900-1000 RPM
Compression Ratio: 24:1 -
Engine Design
Configuration: 3-cylinder inline
Displacement: 54.8 cu in (898 cc)
Bore x Stroke: 2.83" x 2.9" (72 x 73.6 mm)
Fuel Injection: Direct injection
Aspiration: Naturally aspirated -
Systems & Capacity
Cooling: Liquid cooled
Starting: 12 VDC, 1.0 kW with glow plug
Charging: 12V, 40 Amp alternator
Oil Capacity: 3.9 quarts (3.7 L)
Fuel: Ultra Low Sulfur Diesel (≤15 ppm)
Pump End Specifications
Key differences between the BB-4 (high-pressure) and B2X (high-volume) pump ends.
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BB-4 Pump End (4-Stage)
Intake: 2" Male NPSH
Discharge: 1-1/2" Male NPSH
Priming Port: 1-1/2" Male NPSH
Impellers: 3.67" diameter
Max Allowable: 600 PSI
Pump End: Identical to MARK-3 -
B2X Pump End (2-Stage)
Intake: 3" NPT / 4" Victaulic
Discharge: 2-1/2" NPT / 3" Victaulic
Impellers: 4.00" diameter
Max Allowable: 400 PSI
Pump End: Swappable with B2X gas models -
Common Features
Construction: Anodized corrosion-resistant aluminum
Shaft: Stainless steel
Bearings: Maintenance-free sealed
Seal: Blister-resistant carbon/silicon carbide
Clamp: Hand-tight quick-release
FastWire: 14-pin connector
Applications
WATERAX diesel pumps are designed for professional vehicle-mounted applications.
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Type 6 Brush Trucks
The BB-4-D902 is USFS Type 6 Fire Apparatus listed. Compatible with Type 4, 5, and 6 specifications. Diesel fuel matches chassis requirements for single-fuel operations.
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Wildland-Urban Interface
The B2X-D902 delivers 310 GPM for high-volume operations. Run dual 1-1/2" attack lines, supply 2-1/2" handlines, or fill tanks rapidly during WUI incidents.
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Slip-On Units
Both diesel series are popular choices for slip-on/skid-unit applications. Vehicle mounting with 4-leg frame design and FastWire for clean control panel integration.
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OEM Apparatus Builds
Designed for professional apparatus builders. Horizontal or vertical drive options, multiple control panel configurations, and comprehensive documentation for integration.
Documents & Resources
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BB-4-D902 Data Sheet
Official specifications, performance curves, and technical drawings for the BB-4 diesel high-pressure pump.
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B2X-D902 Data Sheet
Official specifications, performance curves, and technical drawings for the B2X diesel mid-range pump.
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BB-4-D902 Owner's Manual
Complete operating instructions, maintenance procedures, and safety guidelines for BB-4 diesel pumps.
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D902 Engine Manual
Kubota D902 engine service manual with maintenance schedules and troubleshooting.
Diesel vs. Gasoline Pumps
Both BB-4 and B2X series are also available with gasoline engines. Here's how to choose.
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Choose Diesel When...
• Fleet runs on diesel (single-fuel logistics)
• Extended run times are common
• Fuel efficiency is a priority
• Operating in extreme heat conditions
• You want to eliminate spark plug/carburetor maintenance
• Building to USFS Type 6 specifications -
Choose Gasoline When...
View Gas Pumps• Weight is critical (diesel pumps are 280 lbs)
• Initial cost is the primary concern
• Portable configurations are needed
• Lower-volume applications suffice
• Existing fleet uses gasoline equipment
• Cold-weather starting without glow plugs preferred
Complete Your Setup
Essential accessories and equipment for diesel pump installations.
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Diesel Control Panels
Shop Control PanelsPMSCP-Diesel panel with glow plug timer, temperature warning, and FastWire connectivity. G1 panel option with tachometer and hour meter.
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Priming Systems
Shop PrimersGuzzler hand primer or 12 VDC electric primer with 25 ft lift capability. Both ship with hardware and 6 ft hose.
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Forestry Hose
Shop Forestry HoseEPDM-lined forestry hose in 1-1/2" and 2-1/2" sizes with compatible couplings for your pump's discharge connections.
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Fittings & Adapters
Shop FittingsNPT and NPSH couplings, wye valves, reducers, and adapters. 2" intake and 1-1/2" discharge compatible.
Shop Diesel Pumps
BB-4-D902 High-Pressure Series
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BB-4-D902V
View BB-4-D902VHigh-pressure 4-stage with vertical drive. 395 PSI / 106 GPM. 14-pin FastWire, 4-leg vehicle mount. 280 lbs. USFS Type 6 listed.
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BB-4-D902H
View BB-4-D902HHigh-pressure 4-stage with horizontal drive. 395 PSI / 106 GPM. 14-pin FastWire, 4-leg vehicle mount. 280 lbs. USFS Type 6 listed.
B2X-D902 High-Volume Series
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B2X-D902V
View B2X-D902VHigh-volume 2-stage with vertical drive. 180 PSI / 310 GPM. 3" NPT/4" Vic intake, 2-1/2" NPT/3" Vic discharge. 280 lbs.
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B2X-D902H
View B2X-D902HHigh-volume 2-stage with horizontal drive. 180 PSI / 310 GPM. 3" NPT/4" Vic intake, 2-1/2" NPT/3" Vic discharge. 280 lbs.
Need Help Selecting a Diesel Pump?
Whether you're building a Type 6 brush truck, outfitting a slip-on unit, or specifying pumps for apparatus manufacturing, we can help you choose the right WATERAX diesel configuration for your application.