Sierra 78866 Fuel Element Assembly
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You have 30 days to request a return. All sale items are final sale.
Sierra 78866 Fuel Element Assembly (47-78866) is a bowl-style fuel filter element designed to help protect your engine by trapping contamination and allowing water to be drained to support longer filter service life. It features Sierra AquaVueâ„¢ clear bowl options for outboard/above-deck installations, and a metal bowl collection for below-deck flame-resistant requirements.
Key Features
- Helps extend fuel filter service life by allowing water to be drained from the filter
- Bowl-style fuel filter design for marine fuel system protection
- AquaVueâ„¢ clear bowl option for outboard and above deck installations
- Metal Bowl Collection option meets USCG flame-resistant requirements for below deck use
Product Compatibility
- Marine gasoline outboard fuel systems
- Marine inboard/auxiliary engines where a bowl-style fuel element assembly is used
- General engine fuel filtration/maintenance applications (verify exact filter head/bowl compatibility)
Product Details
- Product: Sierra 78866 Fuel Element Assembly
- SKU/Variant: 47-78866
- Type: Fuel element assembly (fuel filter)
- Purpose: Fuel filtration with water drain capability to help support longer service life
- Bowl guidance: AquaVueâ„¢ Clear Bowls are intended for outboard and above deck installations; Metal Bowl Collection is used where USCG flame-resistant metal bowls are required below deck
Parts Desk Insights
Best Use Case: Best for routine fuel filter element replacement when you want to maintain filtration performance and retain the ability to drain accumulated water.
Common Issues: Most common service issues are incorrect bowl/head pairing and delayed water draining—confirm the filter assembly diagram and replace any associated seals/gaskets during service per your engine/fuel filter head instructions.
Related Products & Accessories
- Browse Fuel Filters - Find related Sierra fuel filter elements, bowls, and service parts for your fuel/water separator setup.
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.