Impeller F4B
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Impeller F4B is a Johnson Pump-style replacement impeller designed for engine cooling water circulation. Built for proper fit and consistent performance when servicing the F4 pump family.
Key Features
- Replacement impeller for the F4B impeller pump family
- Made to help restore cooling-water flow through the impeller housing
- Engine-cooling maintenance part for keeping raw-water circulation operating correctly
- Part number reference: 189-09810B1 (impeller F4B)
- SKU reference included: 189-09810B1 (variant SKU: 189-09810B1)
Intended Use
- Marine engine cooling systems using an F4-family impeller pump
- Raw-water circulation systems that use the F4B impeller
- General engine-cooling pump service applications (confirm pump type and impeller fitment using your service diagram)
Product Details
- Impeller type: F4B
- Manufacturer/brand reference (from product tags): Johnson Pump
- Impeller part reference: 189-09810B1
- Shopify variant SKU: 189-09810B1
Parts Desk Insights
Best Use Case: Replace the impeller during cooling system service when you need to restore reliable water flow through the pump/impeller housing. Use your pump service diagram to confirm the correct impeller designation (F4B) and that the impeller matches the housing and related components.
Common Issues: Common service issues include installing the wrong impeller designation for the housing, misaligning during assembly, and reusing worn or damaged related components (gaskets/plates) that can affect sealing and pump performance. If water flow is weak after service, re-check impeller orientation, clearances, and that the pump is assembled per the service diagram.
Related Products & Accessories
- Browse impellers - Find additional impellers and cooling-thermostat/impeller related maintenance parts in the Impellers collection.
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.