Johnson Pump Bilge Pump 500 GPH 32503
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Johnson Pump 500 GPH Cartridge Bilge Pump 32503
Product Description
Johnson Pump 32503 is a 12V non-automatic cartridge bilge pump rated at 500 GPH, with a 3/4" outlet and Dura-Port discharge fittings. It is built for small-boat bilge water removal where a compact electric pump is needed and automatic switching is handled separately with a float switch, electronic switch, or panel switch.
Key Features
- Johnson Pump part number 32503.
- 12V electric bilge pump with 500 GPH listed capacity.
- Non-automatic operation; can be paired with a compatible automatic switch or bilge control panel.
- 3/4" discharge connection.
- Includes straight and 90° smooth elbow Dura-Port fittings plus a removable check valve.
- Cartridge motor design allows maintenance without removing the full pump casing from the boat and hose setup.
- Output reference: 33 L/min / 525 GPH at 3 ft head and 40 L/min / 630 GPH straight at 13.6V.
- Electrical reference: 2.5A draw with 5A fuse recommendation.
Engine Compatibility
This is not an engine-specific product. It is selected by boat size, bilge layout, voltage, outlet hose size, switching setup, and pumping capacity. The key application checks are a 12V DC system, 3/4" bilge hose, and whether a non-automatic 500 GPH pump is the correct choice for the installation.
Serial Number Fitment Notice
Match this pump by the boat's bilge system requirements rather than by engine serial number. Confirm the pump voltage, discharge hose size, mounting area, fuse sizing, and whether the system requires a separate automatic switch or manual panel control.
When This Part Needs Replacement
Replace the bilge pump when the motor no longer runs reliably, output is weak, the pump is clogged beyond normal service, the housing is damaged, or the existing pump can no longer keep up with bilge water removal. A non-automatic pump should also be checked alongside the float switch or panel switch when troubleshooting.
Installation Notes
Install using the correct 12V wiring, 5A fuse protection, and 3/4" discharge hose. The included straight and 90° Dura-Port fittings allow the outlet direction to be matched to the hose route, and the cartridge design supports easier service without removing the full pump base from the boat.
Alternate/Superseded Part Numbers
Current references show 32503 as the Johnson Pump model number. One current listing also shows alternate part number 32-1450-01 for this 500 GPH cartridge bilge pump.
Parts Desk Insight
For bilge pumps, the important match is the voltage, outlet size, and automatic vs. non-automatic setup. This 32503 pump is the non-automatic 12V version, so make sure the boat has the right switch arrangement before replacing the pump.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.