Diaphragm & Gasket Kit – Fits Mercury/Mariner 7.5-110HP Outboards (Replaces 1399-5137)
Diaphragm & Gasket Kit – Fits Mercury/Mariner 7.5-110HP Outboards (Replaces 1399-5137) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This Diaphragm & Gasket Kit – Fits Mercury/Mariner 7.5-110HP Outboards (Replaces 1399-5137) is designed to restore fuel pump performance in a wide range of 2-stroke outboard models, covering various years from the 1970s to the 2000s. It provides the essential components to rebuild the carburetor's integrated fuel pump diaphragm and create a reliable seal.
This kit serves as a direct interchange for Mercury 1399-5137, Quicksilver 1399-5137, and Sierra 18-7223.
- Engineered for a direct fit, replacing the original fuel pump diaphragm and gaskets without modification.
- Designed for use in marine environments with gasoline fuel systems.
- Includes the necessary diaphragm and gaskets for a complete fuel pump service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 1399-5137 |
| Quicksilver | 1399-5137 |
| Sierra | 18-7223 |
Engine & Model Compatibility
Confirm your engine model and serial number in the table below to ensure accurate fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 5531630 THRU 0B110788 | 1399-5137 |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 7143688 THRU 0A719280 | 1399-5137 |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 8063985 & Up | 1399-5137 |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 9248006 THRU 9466691 | 1399-5137 |
| Mercury | 50 (4 CYL.) | 50 | 2-Stroke | 5531630 & Up | 1399-5137 |
| Mercury | 50 (4 CYL.) | 50 | 2-Stroke | 7143688 & Up | 1399-5137 |
| Mercury | 50 (4 CYL.) | 50 | 2-Stroke | 8063985 & Up | 1399-5137 |
| Mercury | 50 (4 CYL.) | 50 | 2-Stroke | 9248006 & Up | 1399-5137 |
| Mercury | 500, 50 | 50 | 2-Stroke | 4357640 THRU 5531629 | 1399-5137 |
| Mercury | 500, 50 | 50 | 2-Stroke | 7068998 THRU 7143687 | 1399-5137 |
| Mercury | 500, 50 | 50 | 2-Stroke | 8030090 THRU 8063984 | 1399-5137 |
| Mercury | 500, 50 | 50 | 2-Stroke | 9107214 THRU 9248005 | 1399-5137 |
| Mercury | 7.5 | 7.5 | 2-Stroke | 5206550 & Up | 1399-5137 |
| Mercury | 7.5 | 7.5 | 2-Stroke | 7125388 & Up | 1399-5137 |
| Mercury | 7.5 | 7.5 | 2-Stroke | 8057545 & Up | 1399-5137 |
| Mercury | 7.5 | 7.5 | 2-Stroke | 9217756 & Up | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 3274633 THRU 3801457 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 3801458 THRU 4851692 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 4851693 THRU 5226934 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 7028598 THRU 7111897 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 7111898 THRU 7136037 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 8015315 THRU 8051349 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 8051350 THRU 8058019 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 9043194 THRU 9181725 | 1399-5137 |
| Mercury | 75 | 75 | 2-Stroke | 9181726 THRU 9219255 | 1399-5137 |
| Mercury | 9.8 | 9.8 | 2-Stroke | 5206550 & Up | 1399-5137 |
| Mercury | 9.8 | 9.8 | 2-Stroke | 7127388 & Up | 1399-5137 |
| Mercury | 9.8 | 9.8 | 2-Stroke | 8057545 & Up | 1399-5137 |
| Mercury | 9.8 | 9.8 | 2-Stroke | 9217756 & Up | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 3263263 THRU 3795657 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 3795658 THRU 4839253 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 4839254 THRU 5206549 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 7027323 THRU 7111347 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 7111348 THRU 7125387 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 8015040 THRU 8050624 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 8050625 THRU 8057544 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 9041439 THRU 9165304 | 1399-5137 |
| Mercury | 110 | 110 | 2-Stroke | 9165303 THRU 9217755 | 1399-5137 |
| Mercury | 200 | 200 | 2-Stroke | 3537531 THRU 4709592 | 1399-5137 |
| Mercury | 200 | 200 | 2-Stroke | 7012358 THRU 7098522 | 1399-5137 |
| Mercury | 200 | 200 | 2-Stroke | 8006265 THRU 8045198 | 1399-5137 |
| Mercury | 200 | 200 | 2-Stroke | 9016254 THRU 9157229 | 1399-5137 |
| Mercury | 200, 20 | 200 | 2-Stroke | 4709593 & Up | 1399-5137 |
| Mercury | 200, 20 | 200 | 2-Stroke | 7098523 & Up | 1399-5137 |
| Mercury | 200, 20 | 200 | 2-Stroke | 8045199 & Up | 1399-5137 |
| Mercury | 200, 20 | 200 | 2-Stroke | 9157230 & Up | 1399-5137 |
Technical Specs
- Product Type
- Carburetor Diaphragm and Gasket Kit
- Installation
- Direct replacement for specified engines
- Fuel Type
- Gasoline
- Housing Material
- Paper, Rubber, Diaphragm Materials
- Dimensions (Box)
- 7.25" L x 6.0" W x 0.13" H
- Other Technical Attributes
- For fuel pump diaphragms and gaskets in Mercury outboard carburetors
What’s in the Box
- Diaphragm (Replaces 1399-5137)
- Assorted Gaskets (Replaces 1399-5137)
Installation Notes
- Ensure the engine is off and cool. Disconnect the battery and shut off the fuel supply.
- Remove the engine cowling to access the carburetor assembly.
- Carefully disconnect any fuel lines and linkages attached to the carburetor, noting their original positions for reassembly.
- Unbolt and remove the carburetor from the engine block.
- Disassemble the fuel pump section of the carburetor, which houses the diaphragm and gaskets.
- Remove the old diaphragm and gaskets. Thoroughly clean the mating surfaces to ensure a clean, debris-free seal.
- Install the new diaphragm and gaskets from the kit, ensuring correct orientation.
- Reassemble the carburetor components and mount the carburetor back onto the engine.
- Reconnect fuel lines and linkages, and reinstall the cowling.
- Turn the fuel supply back on, reconnect the battery, and test the engine for proper operation and any signs of leaks.
Troubleshooting & FAQ
How can I confirm this kit fits my specific engine?
This kit fits a wide range of Mercury/Mariner outboards from 7.5 to 110 HP. The best way to ensure compatibility is to match your engine's serial number with the ranges provided in the Engine & Model Compatibility table above.
What are the symptoms of a failing fuel pump diaphragm?
Common signs include difficulty starting, rough or unstable idling, stalling at low speeds, and a general loss of engine power. You may also observe fuel leaking from the carburetor's fuel pump cover.
How often should this kit be used for maintenance?
There is no strict replacement schedule. However, it's recommended to inspect the diaphragm and gaskets during regular carburetor servicing or every 2-3 seasons. Replacement is advised if you notice any signs of hardening, cracking, or fuel leakage.
Is this the right kit for a full carburetor rebuild?
This kit specifically services the fuel pump component of the carburetor. A complete carburetor rebuild would require a more comprehensive kit that includes jets, needles, and other seals not included here.
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.
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