Fuel Pump Diaphragm Kit – Fits Yamaha 115-300HP Outboard Engines (Replaces 6E5-24471-00-00, 6E5-24411-00-00)
Fuel Pump Diaphragm Kit – Fits Yamaha 115-300HP Outboard Engines (Replaces 6E5-24471-00-00, 6E5-24411-00-00) is backordered and will ship as soon as it is back in stock.
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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
Fuel Pump Diaphragm Kit – Fits Yamaha 115-300HP Outboard Engines (R...
Product Details
This high-quality Fuel Pump Diaphragm Kit provides the essential components for servicing fuel pumps on Yamaha 115-300HP 90° V4/V6 and 225-250HP 76° V6 2-stroke outboard engines. It's engineered to restore fuel system efficiency and reliability.
This kit is a direct interchange for multiple original and aftermarket parts, including Yamaha 6E5-24471-00-00, 6E5-24411-00-00, Sierra 18-7788, and others, ensuring broad compatibility.
- Installs as a direct OEM-style replacement for a secure, factory fit.
- Designed for use in standard marine gasoline fuel systems.
- Includes the necessary diaphragms and gaskets for a complete fuel pump rebuild.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6E5-24471-00-00 |
| Yamaha | 6E5-24411-00-00 |
| Yamaha | 6E5-24435-00-00 |
| Yamaha | 6E5-24434-02-00 |
| Sierra | 18-7842 |
| Sierra | 18-7843 |
| Sierra | 18-7788 |
| GLM | 9-35326 |
| OMC | 804001 |
| OMC | 2501 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | B115 | 115 | 2-Stroke | 1998–1999 | 6E5-24471-00-00 | Verified application |
| Yamaha | C115 | 115 | 2-Stroke | 1991–2000 | 6E5-24471-00-00 | Verified application |
| Yamaha | VX150 | 150 | 2-Stroke | 2000–2003 | 6E5-24471-00-00 | Verified application |
Technical Specs
- Product Type
- Fuel Pump Diaphragm Kit
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Dimensions
- 13.0" L x 9.0" W x 0.1" H
- Weight
- 0.02 lbs (0.009 kg)
- Warranty
- Limited Lifetime (Sierra); varies by manufacturer
- Other Technical Attributes
- Includes diaphragms and gaskets for complete fuel pump service
What’s in the Box
- 1 x Diaphragm (Replaces 6E5-24471-00-00)
- 1 x Gasket (Replaces 6E5-24435-00-00)
- 1 x Diaphragm (Replaces 6E5-24411-00-00)
- 1 x Gasket (Replaces 6E5-24434-02-00)
Installation Notes
- Disconnect the negative battery cable.
- Relieve any pressure from the fuel system. Place a rag under the fuel pump to catch spills.
- Carefully disconnect the fuel inlet and outlet lines.
- Remove the bolts securing the fuel pump to the engine.
- Disassemble the old pump, paying close attention to the order and orientation of the diaphragms, gaskets, and covers.
- Clean all mating surfaces of the pump housing, removing any old gasket material.
- Install the new diaphragms and gaskets from the kit, ensuring they align correctly.
- Reassemble the pump and tighten the housing screws evenly.
- Mount the pump back onto the engine and tighten the mounting bolts to the specified torque.
- Reconnect fuel lines, prime the system, and check for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if this kit will fit my engine?
This kit is designed for a wide range of Yamaha V4 and V6 2-stroke outboards. The best way to confirm fitment is to match your engine's original part number to one of the cross-reference numbers in our Part Number Matrix. Also, check the specific models listed in the compatibility table.
What are the signs of a failing fuel pump diaphragm?
Common symptoms include the engine bogging down under load, difficulty starting, rough or inconsistent idling, excessive smoke, or fuel leaking from the pump's weep hole. A physical inspection might reveal stiff, cracked, or visibly degraded diaphragm material.
How often should fuel pump diaphragms be replaced?
There is no universal replacement interval. However, due to the effects of ethanol in modern fuels and general wear over time, it is good practice to inspect the diaphragms during annual service or every 200-300 hours of operation. Replace them at the first sign of damage or stiffness.
Is any sealant required for the gaskets?
In most cases, no additional sealant is needed. The gaskets included in this kit are designed to provide a complete seal when installed on clean, flat surfaces and torqued to the manufacturer's specification. Using sealant can sometimes interfere with the diaphragm's function.
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
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