Johnson Pump Marine Cartridge Bilge Pump 32903 – 1000 GPH, 12V
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Johnson Pump Marine Cartridge Bilge Pump – 1000 GPH, 12V
Part Number: 32903
Brand: Johnson Pump Marine
UPC: 729321329033
Product Overview
The Johnson Pump 32903 is a compact 12V cartridge-style bilge pump rated at up to 1000 GPH in straight-flow conditions. Its removable motor/impeller cartridge lets you service or clean the pump without removing the base from the bilge — a significant convenience for routine maintenance. Water-cooled motor and ISO 8849 certified for marine use.
- Voltage: 12V DC
- Max capacity: 1000 GPH (63 L/min) at straight flow
- Capacity at 3 ft head: 800 GPH (50 L/min)
- Current draw: 3.2 A
- Recommended fuse: 5 A
- Discharge connection: 3/4 inch (Dura-Port)
- Includes straight and 90° Dura-Port discharge fittings
- Includes removable check valve
- Tool-free cartridge removal for maintenance
- Water-cooled motor
- Meets ISO 8849 marine requirements
Compatible Applications
- Recreational powerboats and cruisers
- Fishing vessels and center consoles
- Sailboats and liveaboards
- Any 12V marine installation requiring a compact, serviceable bilge pump
Fitment Note: Confirm 12V electrical system, adequate bilge mounting space, and a compatible 3/4-inch discharge hose. A separate float switch or bilge pump control is required for automatic operation — this pump does not include one.
When to Replace or Service
- Significant reduction in flow output
- Motor runs intermittently or fails to start
- Impeller is visibly damaged or worn
- Pump no longer reliably evacuates bilge water
The cartridge can be pulled and inspected without removing the pump base — check the cartridge before replacing the entire unit.
Installation Notes
- Mount at the lowest practical point in the bilge
- Route discharge hose to minimize restrictions and vertical lift
- Use a 5 A fuse and marine-grade electrical connections
- Verify all hose connections and test operation after installation
Part Number Cross-Reference
- Johnson Pump: 32903
- 24V version: 32903-24 (separate product — confirm vessel voltage)
Related Products
- Johnson Pump 28512 – 1000/1250 GPH Spare Motor Cartridge
- Johnson Pump Cartridge Combo Package – Auto Bilge Pump with Electronic Float Switch, 12V
- Johnson Pump 92205 DuraPort 90° Connection for 500–1000 GPH Cartridge Pumps
- Johnson Pump 92105 DuraPort Straight Connection for 500–1000 GPH Cartridge Pumps
- Johnson Pump 54235PK Bilge Basket
- Automatic Float Switch – 12V/24V 15A Bilge Pump Control
- Seachoice Universal Automatic Marine Bilge Pump Float Switch – 6–32V
Parts Desk Insights
The 32903 is one of the most straightforward bilge pump installs in the Johnson Pump lineup — the tool-free cartridge is its main selling point for customers who want easy seasonal maintenance access. The most common ordering mistake is confusing it with the 24V version (32903-24); always confirm vessel voltage. If a customer needs automatic operation, pair it with a float switch or recommend the combo package instead. For service without full replacement, the 28512 spare motor cartridge covers most failure scenarios.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.