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WATERAX offers a complete line of high performance portable centrifugal pumps.
Products / Fire Pumps / MARK-3® Watson Edition High-Pressure Fire Pump / MARK-3® Watson Edition Fire Pump with Integrated Fuel Tank

MARK-3® Watson Edition Fire Pump with Integrated Fuel Tank

100159

MARK-3® Watson Edition Fire Pump with Integrated Fuel Tank

100159

The MK3-WW is purpose-built to deliver exceptional portability and endurance for wildland firefighting operations. Its integrated 1 US gallon (3.8 L) fuel tank provides up to ~45 minutes of uninterrupted runtime at full throttle - 100% and ~65 minutes at 75% throttle, allowing crews to stay focused on suppression efforts instead of refueling.

When operations extend beyond the initial attack, a three-way fuel valve enables quick, seamless connection to an external fuel source-ensuring continuous power exactly where and when it’s needed. Designed for demanding field conditions, the MK3-WW combines rugged protection, lightweight mobility, and reliable performance to support both rapid deployment and sustained operations in remote terrain.

Maximum pressure
380 PSI (26.2 BAR)
Maximum flow
100 US gals/min (379 L/min)
Maximum head
877’ (267 m)
80 US GPM (303 L/min) @ 100 PSI (6.9 BAR)
70 US GPM (265 L/min) @ 150 PSI (10.3 BAR)
40 US GPM (151 L/min) @ 250 PSI (17.2 BAR)
Model and type
WATERAX W140, 2-cycle, air-cooled, Nikasil cylinder
Maximum Power
10.7 HP (8 kW) @ 8000 RPM
Maximum Torque
7.6 lbf-ft (10 N-m) @ 7050 RPM
Starting System
Recoil starter with backup manual rope starter
Type
Detachable, 4-Stage, Centrifugal Pump
Intake
2” Male NPSH
Discharge
1-1/2” Male NPSH
Dry: 53.2 lbs (24.1 kg)
Wet: 59.6 lbs (27 kg)
Wrap-around (Standard)
Direct Drive
Thread Protector Suction
Suction: 2” NPSH (Standard)
Thread Protector Discharge
Discharge: ¼-Turn Forged w/ Cap (Standard)
Fuel Connector
SAE 45 (Standard) & Mercury
Flow Rate at Specified Pressure
Maximum pressure
380 PSI (26.2 BAR)
Maximum flow
100 US gals/min (379 L/min)
Maximum head
877’ (267 m)
Performance
80 US GPM (303 L/min) @ 100 PSI (6.9 BAR)
70 US GPM (265 L/min) @ 150 PSI (10.3 BAR)
40 US GPM (151 L/min) @ 250 PSI (17.2 BAR)
Engine
Model and type
WATERAX W140, 2-cycle, air-cooled, Nikasil cylinder
Maximum Power
10.7 HP (8 kW) @ 8000 RPM
Maximum Torque
7.6 lbf-ft (10 N-m) @ 7050 RPM
Starting System
Recoil starter with backup manual rope starter
Pump End
Type
Detachable, 4-Stage, Centrifugal Pump
Intake
2” Male NPSH
Discharge
1-1/2” Male NPSH
Weight
Dry: 53.2 lbs (24.1 kg)
Wet: 59.6 lbs (27 kg)
Frame
Wrap-around (Standard)
Drive Unit
Direct Drive
Other Specifications
Thread Protector Suction
Suction: 2” NPSH (Standard)
Thread Protector Discharge
Discharge: ¼-Turn Forged w/ Cap (Standard)
Fuel Connector
SAE 45 (Standard) & Mercury
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