Fuel Pump Diaphragm Kit – Fits Yamaha 4HP & 5HP 2-Stroke (1984-2002)

$7.99 $12.00

Shipping calculated at checkout.

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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Fuel Pump Diaphragm Kit is designed for a range of Yamaha and Mariner outboard motors. It provides a reliable replacement for 4HP and 5HP 2-stroke Yamaha models from 1984–2002, and Mariner 4HP and 5HP 2-stroke models from 1981–1991.

The kit serves as a direct interchange for Yamaha part numbers 6E0-24471-00 and 6E0-24411-00, and Mariner part number 91748M.

Easy to install as a direct replacement part.
Engineered to match factory original equipment performance.
Constructed with durable materials for longevity in marine environments.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Yamaha	6E0-24471-00
Yamaha	6E0-24411-00
Mariner	91748M

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Yamaha owners, this kit fits specific 4HP and 5HP 2-stroke outboards manufactured between 1984 and 2002.

For Mariner owners, this kit is compatible with 4HP and 5HP 2-stroke models produced from 1981 to 1991.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Yamaha	4HP	4	2-Stroke	1984–1999	6E0-24471-00, 6E0-24411-00
Yamaha	5HP	5	2-Stroke	1984–2002	6E0-24471-00, 6E0-24411-00
Mariner	4HP	4	2-Stroke	1981–1991	91748M
Mariner	5HP	5	2-Stroke	1981–1991	91748M

Technical Specs

Product Type: Fuel Pump Diaphragm Kit
Installation: Direct replacement
Fuel Type: Gasoline
Housing Material: Plastic
Housing Color: Black
Dimensions: 5.13 in x 4.0 in x 1.13 in
Weight: 12 g
Other Technical Attributes: Factory original equipment equivalent

What’s in the Box

1 x Fuel Pump Diaphragm Kit (6E0-24471-00, 6E0-24411-00)

Installation Notes

Disconnect the outboard's battery cables to prevent electrical shorts.
Carefully relieve any pressure in the fuel system to avoid spills.
Disconnect the fuel inlet and outlet lines from the fuel pump, noting their positions.
Unbolt and remove the fuel pump assembly from the engine block.
Disassemble the fuel pump housing to access the old diaphragm and related components.
Remove the old diaphragm, gaskets, and seals, and clean the housing surfaces.
Install the new diaphragm and components from the kit, ensuring correct orientation.
Reassemble the fuel pump housing and tighten fasteners to the manufacturer's specified torque.
Reinstall the fuel pump assembly onto the engine.
Reconnect the fuel lines securely to the pump.
Reconnect the battery cables.
Prime the fuel system and carefully inspect for any leaks before starting the engine.

Troubleshooting & FAQ

Will this kit fit my engine?

This kit is designed for specific Yamaha (1984–2002) and Mariner (1981–1991) 4HP and 5HP 2-stroke outboard models. Please check the "Engine & Model Compatibility" table on this page to confirm your exact model and year.

What are the signs of a failing fuel pump diaphragm?

Common symptoms include engine hesitation or stumbling, difficulty starting, loss of power, rough idling, or visible fuel leaks from the pump housing. A torn or stiff diaphragm cannot maintain correct fuel pressure.

Is this one diaphragm or a full kit?

This is a diaphragm kit. Based on the manufacturer's information, it includes the primary components to service the fuel pump diaphragm assembly, referenced by part numbers 6E0-24471-00 and 6E0-24411-00.

What is the difference between part numbers 6E0-24471-00 and 6E0-24411-00?

These part numbers typically refer to individual components within the same fuel pump assembly. 6E0-24471-00 is often the diaphragm itself, while 6E0-24411-00 may be a related gasket or part of the assembly. This kit is designed to replace the necessary components associated with both.

How often should this part be replaced?

There is no fixed replacement interval. It's best to inspect the fuel pump during regular service and replace the diaphragm if you notice any signs of wear, hardening, or cracking, or if you experience fuel delivery problems.

Can I install this myself?

While installation is possible for those with mechanical experience, we recommend professional installation. Working with fuel systems requires care to ensure safety and prevent leaks.

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.