Johnson Pump Marine Ultima Combo Automatic Bilge Pump 08203-00

Product Description

The Johnson Pump Marine Ultima Combo Bilge Pump 08203-00 is a 12V automatic submersible bilge pump assembly designed to remove bilge water from compatible marine compartments. It combines a high-capacity cartridge-style pump with an integrated electronic Ultima water sensor, allowing automatic pump operation without a traditional moving float arm.

The solid-state sensor uses Mirus field-effect detector cell technology to sense water level and activate the pump automatically, helping keep the bilge clear during normal vessel operation.

Key Features

• Johnson Pump Marine Ultima Combo automatic bilge pump.
• Part number: 08203-00.
• 12V DC submersible bilge pump assembly.
• Open-flow capacity reference: 1250 GPH / 79 LPM.
• Flow at 3 ft. head reference: 952 GPH / 60 LPM.
• Integrated electronic Ultima water sensor.
• No exposed mechanical float switch arm.
• Manual override capability with third wire lead.
• Dura-Port quick-connect discharge system.
• Includes straight and 90 smooth elbow fittings.
• Includes removable check valve where supplied.
• Tool-less cartridge motor design for easier service.
• Water-cooled motor with stainless steel shaft and lip seal.

Technical Specifications

• Pump type: automatic submersible bilge pump
• Part number: 08203-00
• Voltage: 12V DC
• Open-flow capacity: 1250 GPH / 79 LPM
• Flow at 3 ft. head: 952 GPH / 60 LPM
• Current draw reference: approximately 3.0 amps
• Recommended fuse size: 5 amps
• Discharge port: 1-1/8 in. / 28.5 mm Dura-Port
• Fittings included: straight fitting and 90 elbow fitting
• Switch type: integrated solid-state electronic sensor
• Shaft material reference: SS2343 stainless steel
• Seal type: lip seal

System Compatibility

Common application context includes compatible marine bilge systems requiring a 12V automatic pump with a 1-1/8 in. discharge connection, including:

• Powerboats.
• Cruisers.
• Fishing boats.
• Workboats.
• Auxiliary bilge pump installations.
• Replacement automatic bilge pump applications where 1250 GPH capacity and 12V wiring are suitable.

Use this pump only where the vessels electrical system, hose size, discharge routing, bilge layout, fuse protection, and mounting area match the pump specifications.

Fitment Notice

Confirm voltage, discharge hose size, available mounting space, wiring layout, fuse size, bilge depth, discharge head height, and switch configuration before ordering. Bilge pump performance depends on hose length, vertical lift, fittings, check valves, battery condition, and discharge routing.

This is a complete automatic pump assembly. It is not just a standalone float switch or replacement motor cartridge.

When This Pump Needs Replacement

Replace the pump if the motor fails, the housing is cracked, the sensor no longer activates reliably, the pump runs but does not move water, the impeller is damaged, the wiring is corroded, or the pump cannot keep up with normal bilge water removal.

Replacement is also recommended when upgrading bilge capacity, servicing an older automatic pump, or replacing a unit with unreliable mechanical float switch operation.

Installation Notes

Mount the pump low in the bilge in a clean, accessible location. Route the discharge hose with smooth bends and secure it above the waterline according to the vessels bilge plumbing layout. Use the correct 1-1/8 in. bilge hose and approved marine wiring practices.

Wire the pump with proper fuse protection and corrosion-resistant electrical connections. The automatic lead should be connected for sensor-controlled operation, while the manual override lead can be connected to a suitable dashboard switch. Test automatic and manual operation after installation and confirm strong discharge flow with no leaks.

Related Service Parts

• Johnson Pump 08203-00 complete Ultima Combo automatic bilge pump assembly
• 1-1/8 in. bilge hose verify hose routing and discharge length
• Marine-grade wire, fuse holder, and 5 amp fuse verify installation requirements
• Replacement cartridge motor verify exact pump series before ordering
• Bilge check valve or discharge fittings use only where suitable for the bilge system layout

Parts Desk Insight

The key advantage of this pump is the integrated electronic sensor and removable cartridge design. The electronic sensor avoids the sticking issues that can happen with mechanical float arms, while the cartridge motor layout makes future service easier without removing the entire pump base or reworking the plumbing.

Shipping: Ships same or next day for fast Canada wide shipping.