Mercury MerCruiser 3.0L Fuel Pump Gasket - 27-8M0108647
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The Mercury MerCruiser Quicksilver 27-8M0108647 is a genuine Mercury Marine OEM fuel pump gasket used on select MerCruiser gasoline engines where the factory parts diagram calls for this gasket at the fuel pump mounting location. This current service part replaces the earlier 27-431861 / 431861 gasket and helps seal the fuel pump mounting surface to prevent fuel seepage, air leakage, and improper fuel pump sealing after service.
Key Features
- Genuine Mercury Marine factory OEM gasket.
- Current Mercury/MerCruiser part number: 27-8M0108647.
- Current manufacturer part number: 8M0108647.
- Earlier Mercury/MerCruiser reference: 27-431861 / 431861.
- Official part label: GASKET.
- GTIN/UPC: 745061150096.
- Listed shipping weight: 0.13 lb.
- Listed shipping dimensions: 3.00 in. L x 2.50 in. W x 0.15 in. H.
- Used where the Mercury/MerCruiser fuel pump diagram specifically calls for this gasket.
Engine Compatibility
Common where-used MerCruiser application groups for the earlier 27-431861 reference include select GM inline-4 gasoline engines by serial number and fuel pump diagram, including:
- 120 GM 153 I/L4 applications where specified
- 140 GM 181 I/L4 applications where specified
- 2.5L GM 153 I/L4 applications where specified
- 3.0L GM 181 I/L4 applications where specified
- 3.0LX GM 181 I/L4 applications where specified
- Select 3.0L MPI EC and 3.0L TKS Plus applications where the factory diagram calls for this gasket
Use this gasket only where the Mercury/MerCruiser parts diagram specifically calls for 27-8M0108647, 8M0108647, 27-431861, or 431861.
Serial Number Fitment Notice
Confirm fitment by engine serial number, fuel pump style, fuel system diagram, and mounting location before ordering. MerCruiser engines with similar displacement can use different fuel pumps, gaskets, O-rings, fittings, filters, and mounting hardware depending on production range and fuel system configuration.
When This Part Needs Replacement
Replace this gasket whenever the fuel pump is removed or serviced. It should also be replaced if the original gasket is torn, compressed, fuel-soaked, hardened, leaking, stuck to the mounting surface, or damaged during removal. A poor fuel pump gasket seal can contribute to fuel seepage, fuel odor, hard starting, poor fuel delivery, or repeat service issues after pump installation.
Installation Notes
Clean both mating surfaces before installing the new gasket. Remove old gasket material carefully without gouging aluminum or machined sealing faces. Confirm the fuel pump mounting surface is flat, the fasteners are clean, and the correct fuel pump is being installed for the engine serial number. Install the gasket according to the Mercury service manual for the specific engine, and avoid adding silicone or non-approved sealants unless the service procedure specifically calls for them.
Alternate/Superseded Part Numbers
- 27-8M0108647 — current Mercury/MerCruiser formatted service part number
- 8M0108647 — current manufacturer part number
- 27-431861 — earlier Mercury/MerCruiser formatted part number
- 431861 — earlier manufacturer/base part number
- 27-43186 1 — alternate printed/catalog spacing reference
Parts Desk Insight
Fuel pump gaskets should be replaced any time the pump is removed because old gasket material often compresses, tears, or sticks to the block during disassembly. Matching the gasket by Mercury part number and engine serial number helps prevent fuel leaks and avoids installing a similar-looking gasket in the wrong fuel pump location.
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
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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.
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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:
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