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Outboard Motor Parts | OEM & Aftermarket

Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.

Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.

 

Shop Outboard Parts by Manufacturer

 

Find the Correct Outboard Part

Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.

Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.

Use Our OEM Parts Lookup »
 

Shop Outboard Parts by Engine System

Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.

 

Common Outboard Problems and Where to Start

  • Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
  • Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
  • Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
  • Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
  • Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
  • Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
  • Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
 

Why Buy Outboard Parts from Pro Marine USA?

  • OEM and aftermarket replacement options for major outboard engine brands.
  • Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
  • OEM diagram and part-number lookup tools to help identify the correct component before ordering.
  • Dealer pricing available for qualified marine repair businesses and dealers.
  • Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
  • Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
 

OEM and Aftermarket Outboard Parts

OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.

Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.

 

Frequently Asked Questions

How do I find the correct parts for my outboard motor?

Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.

Can I search Pro Marine by OEM part number?

Yes. If you already have the OEM part number, enter it into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.

What information should I have before ordering an outboard part?

Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.

What is the difference between OEM and aftermarket outboard parts?

OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.

Are aftermarket outboard motor parts reliable?

Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.

Do you carry parts for older outboard motors?

Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.

What outboard parts are commonly replaced during routine maintenance?

Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.

 

Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.

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Pro Marine Fuel Pump Rebuild Kit for Mercury Mariner Inline 6 2 Stroke Outb

Fuel Pump Kit 115

The Fuel Pump Kit 115 is a Pro Marine rebuild kit designed for Mercury and Mariner inline 6-cylinder 2-stroke outboards. This kit restores proper fuel delivery by replacing worn internal components in diaphragm-style mechanical fuel pumps.

Fitment Overview

This kit replaces Mercury OEM part numbers 66599A3 and 89031A3, along with Sierra 18-7813, GLM 40370, and Mallory 9-37752. These cross reference numbers identify the Mercury inline-6 fuel pump family used on 90HP, 115HP, and 140HP engines.

Compatibility

BrandHorsepowerEngine Type
Mercury90 HPInline 6-Cylinder 2-Stroke
Mercury115 HPInline 6-Cylinder 2-Stroke
Mercury140 HPInline 6-Cylinder 2-Stroke
Mariner90 HPInline 6-Cylinder 2-Stroke
Mariner115 HPInline 6-Cylinder 2-Stroke
Mariner140 HPInline 6-Cylinder 2-Stroke

These engines share a common diaphragm-style fuel pump design tied to the 66599A3 / 89031A3 fuel pump assembly.

Example Model Applications

  • Mercury 90HP inline-6 2-stroke models (late 1970s–1980s)
  • Mercury 115HP inline-6 2-stroke models
  • Mercury 140HP inline-6 2-stroke models
  • Mariner equivalents using the same fuel pump assembly

These are typical applications for this fuel pump kit. Always verify by matching your OEM part number or fuel pump assembly before ordering.

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 66599A3, 89031A3, 18-7813, 40370, or 9-37752.

Using a different pump style? This engine family may also use an alternate A1-style kit.
View Sierra 18-7811 Fuel Pump Kit (A1 Style)

Part Numbers and Cross References

TypePart Number
Pro Marine115
Mercury OEM66599A3
Mercury OEM89031A3
Sierra18-7813
GLM40370
Mallory9-37752

What This Part Is Used For

This kit rebuilds mechanical diaphragm fuel pumps by replacing worn internal components such as diaphragms, gaskets, and valves. Proper fuel pump operation is essential for maintaining consistent fuel delivery to the engine.

  • Restores proper fuel pressure and flow
  • Replaces worn diaphragms and seals
  • Helps eliminate fuel starvation issues
  • Supports smooth engine performance

A failing fuel pump can cause hard starting, hesitation, loss of power, or engine stalling.

System Function and Connections

  • System Type: Mechanical fuel delivery system
  • 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 this fuel pump style.

What is the difference between this and the A1 kit?
This kit fits the A3-style fuel pump (66599A3 / 89031A3). Some engines use a different pump design that requires the A1-style 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, poor acceleration, fuel starvation, 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.

Apply for a Dealer Account

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

115 fuel pump kit, 66599A3, 89031A3, 18-7813, 40370, 9-37752, Mercury inline 6 fuel pump rebuild kit

Item#:
115
Cross Reference#:
0508429
18-7811
18-7813
40350
40370
508429
66599A1
66599A3
89031A1
89031A3
9-37752
9-37756
Manufacturer Item:
89031A3
Manufacturer:
Engineered Marine Parts
Available:
In Stock
Your Price:
15.99
Each
Mercury 135-200 2.0L 2.4L
Item#:
114
Cross Reference#:
18-7812
18-7812
40360
508430
66599A2
89031A2
9-37751
Manufacturer Item:
89031A2
Manufacturer:
Engineered Marine Parts
Available:
In Stock
Your Price:
13.49
Each
Mercury 50-70 Inline 2-3cyls
Item#:
112
Cross Reference#:
18-7809
18-7809
40340
40340
508428
55278A3
55278A3
55278A4
55278A4
Manufacturer Item:
55278A4
Manufacturer:
Sierra
Available:
In Stock
Your Price:
8.59
Each
Mercury 75-85 Inline
Item#:
111
Cross Reference#:
18-7808
18-7808
18-7808
40330
40330
508427
55278A2
55278A2
55278A5
55278A5
9-37750
Manufacturer Item:
55278A5
Manufacturer:
Engineered Marine Parts
Available:
In Stock
Your Price:
7.99
Each
Mercury 2.4L
Item#:
L055
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
148.20
Each
Yamaha 3 Cylinder 60-70hp Bore 2.834 O.D. 3.078
Item#:
L051
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
136.80
Each
Mercury 3 Cyilnder Bore 3.375 Outer Diameter 3.670
Item#:
L050
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
148.20
Each
Mercury 4 Cylinder Bore 3.375 Outer Diameter 3.670
Item#:
L053
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
142.50
Each
Mercury 3 Cylinder Bore 3.375 Outer Diameter 3.670
Item#:
L052
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
142.50
Each
Mercury 4 Cylinder Bore 2 7/8 Outer Diameter 3 1/8
Item#:
L021
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
136.80
Each
Yamaha F/LF 115 2002-Later
Item#:
3442P
Cross Reference#:
18-3442
6E5-44311-00-00
61A-W0078-A1-00
61A-W0078-A2-00
61A-W0078-A3-00
61A-W0078-A4-00
61A-W0078-00-00
61A-W0078-01-00
61A-44311-00-00
61A-44311-01-00
64L-W0078-00-00
65L-W0078-A0-00
65L-W0078-A1-00
68V-W0078-00-00
68V-W0078-01-00
8M6012787
8M6012803
8M6012804
Manufacturer Item:
68V-W0078-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
102.95
Each
Suzuki V4 DT-115 Bore 3.307 O.D. 3.668
Item#:
L029
Manufacturer:
La Sleeves
Available:
In Stock
Your Price:
148.20
Each
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