Fuel Pump Gasket – Fits Mercury/Mercruiser 470, 485, 488 Series (Replaces 27-72805)
Fuel Pump Gasket – Fits Mercury/Mercruiser 470, 485, 488 Series (Replaces 27-72805) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This high-quality aftermarket Fuel Pump Gasket ensures a proper seal between the fuel pump and the engine block. It is designed specifically for Mercury/Mercruiser 224 I/L4 engines, including the 470, 485, and 488 models manufactured between 1976 and 1984.
It serves as a direct interchange for Mercury 27-72805, GLM 31800, and Aqua Power 376, providing a reliable, cost-effective replacement for this obsolete OEM part.
- Seals the fuel pump mounting surface to prevent leaks.
- Engineered for use in gasoline marine environments.
- Includes one gasket for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 27-72805 | No longer available from OEM (NLA) |
| GLM | 31800 | Aftermarket Replacement |
| Aqua Power | 376 | Aftermarket Replacement |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for the following Mercury/Mercruiser applications.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 470 (2 BBL.) | 224 I/L4 | 4-Stroke | 1976–1979 | 27-72805 | SN: 4208730–5520114 |
| Mercury | 470 (2 BBL.) | 224 I/L4 | 4-Stroke | 1980–1982 | 27-72805 | SN: 5520115–6218036 |
| Mercury | 470 (2 BBL.) | 224 I/L4 | 4-Stroke | 1983–1984 | 27-72805 | SN: 6218037–6916778 |
| Mercury | 470 MIE | 224 I/L4 | 4-Stroke | 1980–1981 | 27-72805 | SN: 5520115–6218036 |
| Mercury | 485 (2 BBL.) | 224 I/L4 | 4-Stroke | 1980–1982 | 27-72805 | SN: 5685394–6218036 |
| Mercury | 488 (4 BBL.) | 224 I/L4 | 4-Stroke | 1983–1984 | 27-72805 | SN: 6170297–6916778 |
Technical Specs
- Product Type
- Fuel Pump Gasket
- Installation
- Between fuel pump and engine block
- Material
- Paper/Composite
- Fuel Type
- Gasoline
- Dimensions
- 7.0" L x 7.0" W x 0.1" H
- Weight
- 0.32 ounces (9.07 grams)
- OEM Supersession
- No longer manufactured by OEM (NLA)
What’s in the Box
- 1 x Fuel Pump Gasket (Replaces 27-72805)
Installation Notes
- Disconnect the negative battery terminal for safety.
- Carefully relieve any pressure in the fuel system according to your engine's service manual.
- Place an absorbent rag under the fuel pump and disconnect the fuel inlet and outlet lines.
- Remove the mounting bolts securing the fuel pump to the engine block.
- Gently detach the pump and remove the old gasket.
- Thoroughly clean both the engine block and fuel pump mating surfaces, ensuring they are free of old gasket material and debris.
- Position the new gasket onto the engine block, aligning it with the bolt holes.
- Reinstall the fuel pump, tightening the mounting bolts evenly to the manufacturer-specified torque.
- Reconnect the fuel lines securely.
- Reconnect the battery, prime the fuel system if necessary, and start the engine.
- Inspect carefully for any signs of fuel leaks around the pump and fittings.
Troubleshooting & FAQ
How do I know if the fuel pump gasket is failing?
Common signs of a bad gasket include visible fuel leaks or stains around the fuel pump, a strong smell of gasoline in the engine bay, poor engine performance, hesitation during acceleration, or difficulty starting the engine.
Should I use sealant with this gasket?
Most paper and composite gaskets are designed to be installed dry. Applying sealant can sometimes cause the gasket to slip or break down. Always refer to your engine's official service manual for the most accurate procedure.
My engine model isn't listed. Will this part fit?
We can only guarantee fitment for the specific Mercury/Mercruiser models, years, and serial number ranges listed in the compatibility table. Using it on other models is not recommended.
How often should this gasket be replaced?
The gasket should be replaced any time the fuel pump is removed for service or replacement. It should also be replaced immediately if you detect any signs of leakage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
