Johnson Pump 4000 GPH Bilge Pump 12V
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Keep your bilge under control with the Johnson Pump 4000 GPH Bilge Pump 12V (189-40004). Built for demanding commercial and recreational use, this high-capacity pump is engineered for reliability with a liquid-cooled, tall stack 12-pole motor and low amp draw. It also includes a removable check valve and internally threaded duraport fittings for straightforward installation.
Key Features
- High volume 4000 GPH performance for fast bilge water removal
- Liquid cooled, tall stack 12-pole motor with double ball bearing design for extended service life
- Low amp draw design to help reduce electrical load
- Includes multiple port size internally threaded duraports: 1-1/8” and 1-1/2”
- Removable check valve included
- Robust high-impact ABS plastic construction with unique threaded port design
- Made in USA
- 3-year warranty
Product Compatibility
- 12V DC marine bilge pump applications (livewell/bilge systems requiring high-capacity pumping)
- Recreational and light commercial inboard/outboard boats with 12V electrical systems
- Systems that use a removable check valve and standard marine discharge connections
Product Details
- Brand/Model: Johnson Pump 4000 GPH Bilge Pump 12V
- SKU/Part number: 189-40004
- Power: 12V
- Capacity: 4000 GPH
- Mounting/Port fittings included: 2 internally threaded duraports, 1-1/8” and 1-1/2”
- Check valve: removable (included)
- Warranty: 3 year warranty
- Barcode: Omits barcode because the provided value is in scientific notation
Parts Desk Insights
Best Use Case: Ideal for boats that need high-rate, dependable bilge pumping and prefer a pump designed around durable motor cooling and a removable check valve for service access.
Common Issues: For best performance, verify your discharge plumbing matches the included port sizes (1-1/8” and 1-1/2”) and use compatible marine-grade hoses/fittings. During service, check that the check valve seats cleanly and that the pump’s mating surfaces remain sealed to prevent recirculation or air leaks.
Related Products & Accessories
- Browse Bilge Pump Accessories & Switches - Use the bilge-pumps collection to find compatible switch and plumbing accessories.
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.