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Sierra Fuel Pump Kit 18-7811
The Sierra 18-7811 Fuel Pump Kit is a rebuild kit designed for Mercury and Mariner inline 6-cylinder 2-stroke outboards. This kit restores proper fuel delivery by replacing worn diaphragms and internal components in mechanical fuel pumps.
Fitment Overview
This Sierra kit replaces Mercury OEM part numbers 66599A1 and 89031A1, along with GLM 40350 and Mallory 9-37756. These part numbers identify a fuel pump family used on Mercury inline-6 engines.
Compatibility
| Brand | Horsepower | Engine Type |
|---|---|---|
| Mercury | 90 HP | Inline 6-Cylinder 2-Stroke |
| Mercury | 115 HP | Inline 6-Cylinder 2-Stroke |
| Mercury | 140 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 90 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 115 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 140 HP | Inline 6-Cylinder 2-Stroke |
These engines use a mechanical diaphragm-style fuel pump associated with the 66599A1 / 89031A1 fuel pump assembly.
Example Model Applications
- Mercury 90HP inline-6 2-stroke models
- Mercury 115HP inline-6 2-stroke models
- Mercury 140HP inline-6 2-stroke models
- Mariner equivalent inline-6 models
These are typical applications. Always verify by matching your OEM part number.
Fits These Serial Ranges
This fuel pump kit is used across multiple Mercury inline-6 engine generations and does not follow a single serial-number break.
Important: Confirm compatibility by matching your existing fuel pump or OEM number to 66599A1, 89031A1, 18-7811, 40350, or 9-37756.
Need the alternate fuel pump kit for a different pump style?
View Pro Marine Fuel Pump Kit 115 (A3 Style)
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Sierra | 18-7811 |
| Mercury OEM | 66599A1 |
| Mercury OEM | 89031A1 |
| GLM | 40350 |
| Mallory | 9-37756 |
What This Part Is Used For
This kit rebuilds diaphragm-style fuel pumps by replacing worn internal components such as gaskets, valves, and diaphragms. It restores proper fuel flow and pressure to the engine.
- Rebuilds mechanical fuel pump assemblies
- Restores fuel pressure and delivery
- Helps eliminate fuel starvation issues
- Supports reliable engine performance
A failing fuel pump can cause hesitation, stalling, hard starting, or poor acceleration.
System Function and Connections
- System Type: Mechanical fuel delivery
- Pump Type: Diaphragm fuel pump
- Location: Engine-mounted fuel pump assembly
FAQ
What engines does this kit fit?
It fits Mercury and Mariner inline 6-cylinder 2-stroke outboards in the 90HP, 115HP, and 140HP range using the A1-style fuel pump.
What is the difference between this and the A3 kit?
This kit fits the A1-style fuel pump (66599A1 / 89031A1). Some engines use a different pump design that requires the A3 kit.
How do I confirm fitment?
Match your fuel pump number or OEM part number to the cross references listed above.
What are signs of a bad fuel pump?
Hard starting, fuel starvation, hesitation, or engine stalling.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.).
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
18-7811, 66599A1, 89031A1, 40350, 9-37756, Sierra fuel pump kit, Mercury inline 6 fuel pump kit, Mercury 115 fuel pump rebuild kit
18-7811
40370
508429
66599A1
89031A1
9-37752
693
9-29109
0307573
0395460
0777484
395460
777484
9-29900
97296
9-40419
9-40100
9-43714
90206
90206-22M19-00
Sierra Marine Cooling System Component
Yamaha V4 V6 115-300HP & Mercury 225/250 Driveshaft Collar
The Sierra 18-9076 Driveshaft Collar is a direct replacement for Yamaha OEM 61A-45527-00-00 and Mercury OEM 8886901. This collar is used in the water pump assembly on numerous Yamaha V4 and V6 outboards as well as Mercury 225 and 250 EFI FourStroke applications.
During water pump service, lower unit repairs, or cooling system rebuilds, replacing worn collars can help maintain proper component alignment and reliable cooling system operation.
Compatible Applications
Yamaha OEM number 61A-45527-00-00 is used across a large range of Yamaha V4 and V6 outboards including Saltwater Series, EFI, OX66, HPDI, VMAX, and select four-stroke models. Mercury OEM 8886901 cross references to Mercury 225 and 250 EFI FourStroke applications.
| Manufacturer | Common Applications |
|---|---|
| Yamaha | 115HP, C115, S115 |
| Yamaha | 130HP, L130 |
| Yamaha | 150HP, C150, D150, DX150, FL150, LF150, LX150, SX150, VX150, VZ150, Z150 |
| Yamaha | 175HP Models |
| Yamaha | 200HP, F200, LF200, LX200, SX200, VX200, VZ200, Z200 |
| Yamaha | 225HP, F225, LF225, LX225, VX225, V225, OX66 225, VMAX 225 |
| Yamaha | 250HP, L250, LX250, SX250, VX250, VZ250, Z250, OX66 250 |
| Yamaha | 300HP, LZ300, VZ300, Z300 |
| Mercury | 225 EFI FourStroke |
| Mercury | 250 EFI FourStroke |
Yamaha used this collar across numerous V4 and V6 platforms over multiple years and engine families. Always verify your engine serial number and OEM part number before ordering.
This Sierra collar replaces Yamaha OEM 61A-45527-00-00 and Mercury OEM 8886901.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Sierra | 18-9076 |
| Yamaha OEM | 61A-45527-00-00 |
| Mercury OEM | 8886901 |
Available in Multiple Brands
OEM Yamaha 45527
Genuine Yamaha factory replacement for customers who prefer OEM parts.
View OEM Version
Pro Marine 45527P
Popular aftermarket replacement trusted by marine technicians and repair shops.
View Pro Marine Version
GLM 9076GM
Alternative aftermarket option from GLM Marine for the same Yamaha and Mercury applications.
View GLM VersionWhat This Part Is Used For
The driveshaft collar is part of the lower unit cooling system assembly and works with the water pump housing, wear plate, impeller, and related components. Proper spacing and alignment are critical to water pump performance and cooling system efficiency.
Many technicians replace collars whenever major water pump service is performed, particularly on high-hour engines or saltwater-operated boats.
Why Replace a Driveshaft Collar?
- Corrosion may affect proper component fitment
- Wear can impact water pump assembly alignment
- Often serviced during water pump rebuilds
- Helps maintain proper cooling system operation
- Ideal preventative maintenance item during lower unit service
Sierra 18-9076 Features
- Direct replacement for Yamaha 61A-45527-00-00
- Direct replacement for Mercury 8886901
- Fits many Yamaha V4 and V6 applications from 115HP-300HP
- Compatible with Mercury 225 and 250 EFI FourStroke models
- Quality Sierra Marine aftermarket construction
- OEM, Pro Marine, and GLM alternatives available above
FAQ
What OEM numbers does Sierra 18-9076 replace?
Yamaha 61A-45527-00-00 and Mercury 8886901.
What Yamaha engines commonly use this collar?
Many Yamaha 115HP, 130HP, 150HP, 175HP, 200HP, 225HP, 250HP, and 300HP V4 and V6 applications including OX66, VMAX, EFI, Saltwater Series, and select four-stroke models.
Does this fit Mercury outboards?
Yes. Mercury 225 and 250 EFI FourStroke models commonly use Mercury OEM 8886901.
Do you carry OEM and aftermarket alternatives?
Yes. OEM Yamaha, Pro Marine, and GLM versions are linked above.
Should I replace this during water pump service?
If wear, corrosion, or damage is present, replacement is recommended while the lower unit is apart.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new and unused.
- Installed parts are not returnable.
- Return authorization required before return.
Searchable Terms
Sierra 18-9076, 18-9076, Yamaha 61A-45527-00-00, Mercury 8886901, Yamaha V4 driveshaft collar, Yamaha V6 driveshaft collar, Yamaha VMAX water pump parts, Yamaha OX66 cooling system parts, Yamaha 225 driveshaft collar, Yamaha 250 driveshaft collar, Mercury 225 EFI FourStroke parts, Mercury 250 EFI FourStroke parts, Pro Marine 45527P, GLM 9076GM, OEM Yamaha 45527
8886901
9-43712