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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
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts 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.
64-889934A01
702755021421
64-889931A01
702755021384
0584918
0765841
0765865
584918
765865
810B
810C
883323
883323001
702755021407
Pro Marine 5/16" Outboard Fuel Primer Bulb
Pro Marine 8004 5/16" Marine Fuel Primer Bulb
The Pro Marine 8004 Primer Bulb is designed for marine fuel-line systems using 5/16" inside-diameter fuel hose. It can be used when building or repairing custom outboard fuel-line assemblies using compatible Type A, Type B or Mercury OEM 5/16" fuel hose.
Primer bulbs allow the operator to manually draw fuel through the fuel line and toward the engine before starting. This helps fill an empty fuel line, purge air from the system and supply fuel to the engine during initial startup.
Pro Marine stocks multiple 5/16" bulk marine fuel-hose options, the correct Oetiker clamp for each hose, and the tools required to properly install the clamps.
Primer Bulb: Pro Marine 8004
Hose Size: 5/16" ID
Application: Marine / Outboard Fuel Line
Type B Hose: MPI 315-056
Type A Hose: MPI 313-1
Mercury OEM Hose: #100 Silver Fuel Hose
What This Primer Bulb is Used For
A primer bulb is installed inline in an outboard fuel hose and acts as a manual fuel pump.
Squeezing and releasing the bulb draws fuel from the tank and pushes it toward the engine. Internal one-way check valves help keep fuel moving in the proper direction.
Primer bulbs are commonly used when:
- Starting an outboard after the fuel line has drained
- Priming a newly installed fuel line
- Refilling the line after fuel-system service
- Purging air from the fuel hose
- Replacing an old, hardened or damaged primer bulb
Compatible 5/16" Fuel Hose Options
Pro Marine stocks three common 5/16" fuel-hose options that can be used with this primer bulb. The correct hose depends on the installation and required fuel-hose classification.
MPI 5/16" Type B Fuel Hose - 315-056
5/16" Type B marine fuel hose commonly used in exposed and above-deck applications where Type B hose is appropriate.
Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-153
MPI 5/16" Type A Fuel Hose - 313-1
Type A marine fuel hose for installations requiring the additional Type A fire-resistant classification.
Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-170
Mercury OEM 5/16" Silver Fuel Hose
Genuine Mercury Marine bulk 5/16" fuel hose for compatible Mercury outboard fuel-line applications.
Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-145
Correct Clamp for Each 5/16" Fuel Hose
All three hoses have a 5/16" inside diameter, but they do not have the same outside diameter. Different constructions and wall thicknesses require different Oetiker clamp sizes.
| Fuel Hose | Hose Type | Correct Clamp | Primer Bulb |
|---|---|---|---|
| MPI 315-056 | Type B | Oetiker 4-153 | Pro Marine 8004 |
| MPI 313-1 | Type A | Oetiker 4-170 | Pro Marine 8004 |
| Mercury OEM #100 | Mercury Silver Fuel Hose | Oetiker 4-145 | Pro Marine 8004 |
Do not choose a clamp based only on the hose's 5/16" inside diameter.
Match the Oetiker clamp to the specific hose:
MPI Type B 315-056 = Oetiker 4-153
MPI Type A 313-1 = Oetiker 4-170
Mercury OEM Silver Hose #100 = Oetiker 4-145
Fuel Line Clamps and Installation Tools
Oetiker 4-153 Ear Clamp - 10 Pack
Correct clamp for the MPI 315-056 5/16" Type B fuel hose.
View Oetiker 4-153 Clamp
Oetiker 4-170 Ear Clamp - 10 Pack
Correct clamp for the MPI 313-1 5/16" Type A fuel hose.
View Oetiker 4-170 Clamp
Oetiker 4-145 Ear Clamp - 10 Pack
Correct clamp for the Mercury OEM 5/16" silver fuel hose.
View Oetiker 4-145 Clamp
Oetiker Standard Jaw Pincer Tool
Installation tool for properly closing Oetiker ear clamps when assembling marine fuel-line connections.
View Oetiker Pincer Tool
Oetiker Clamp Pack with Tool
Assortment of common Oetiker clamp sizes with the installation tool included. A convenient option for marine shops and technicians working with multiple hose sizes.
View Oetiker Clamp PackHow a Primer Bulb Works
The primer bulb contains internal one-way check valves. When the bulb is squeezed and released, the valves allow fuel to move in one direction through the hose.
Repeatedly squeezing the bulb draws fuel from the fuel tank, fills the fuel line and supplies fuel toward the engine.
Primer Bulb Installation
Install the primer bulb with the fuel-flow arrow pointing toward the engine.
Secure each hose connection using the correct clamp for the specific fuel hose being installed.
When Should a Primer Bulb Be Replaced?
Primer bulbs are continually exposed to fuel, heat and the marine environment and can deteriorate over time.
Inspect or replace the primer bulb if you notice:
- Cracking or visible deterioration
- A bulb that has become excessively hard
- A bulb that stays collapsed
- A bulb that will not become firm when priming
- Fuel leaking around the bulb or hose connections
- Air entering the fuel system
- Internal check-valve problems
Building a Complete 5/16" Outboard Fuel Line
Depending on the installation, a complete 5/16" fuel-line assembly may require:
- Pro Marine 8004 5/16" primer bulb
- 5/16" Type A, Type B or Mercury OEM fuel hose
- Correct tank-side connector or fitting
- Correct engine-side connector or fitting
- Correct Oetiker clamps for the selected hose
- Oetiker pincer installation tool
Type A, Type B or Mercury OEM Fuel Hose?
The Pro Marine 8004 primer bulb fits all three listed hose options because each hose has a 5/16" inside diameter.
The difference is in the hose construction and intended installation.
MPI Type B 315-056 is commonly used in exposed and above-deck applications where Type B hose is permitted.
MPI Type A 313-1 is used where the installation requires the additional Type A fire-resistant classification.
Mercury OEM #100 is the genuine Mercury 5/16" silver fuel-hose option for compatible Mercury fuel-line applications.
Key Features
- Pro Marine 8004 marine fuel primer bulb
- Designed for 5/16" ID fuel hose
- Compatible with MPI 315-056 Type B hose
- Compatible with MPI 313-1 Type A hose
- Compatible with Mercury OEM #100 5/16" silver hose
- Used to manually prime outboard fuel systems
- Helps draw fuel from the tank toward the engine
- Matching Oetiker clamps available for each hose
- Oetiker pincer installation tool available
- Complete Oetiker clamp assortment with tool available
Need Help Building Your Marine Fuel Line?
Hose size, fuel-hose classification, primer bulb size and clamp selection all need to match the fuel-system installation.
Visit the Pro Marine Fuel Line Technical Center
FAQ
What size hose does the Pro Marine 8004 primer bulb fit?
The 8004 is designed for 5/16" ID fuel hose.
Can I use this primer bulb with MPI Type B hose?
Yes. It fits the
MPI 315-056 5/16" Type B fuel hose
.
Can I use it with Type A hose?
Yes. It also fits the
MPI 313-1 5/16" Type A fuel hose
.
Can I use it with Mercury OEM 5/16" silver fuel hose?
Yes. The
Mercury OEM #100 5/16" silver hose
also has a 5/16" inside diameter.
Which clamp fits MPI 315-056 Type B hose?
Use the
Oetiker 4-153 ear clamp
.
Which clamp fits MPI 313-1 Type A hose?
Use the
Oetiker 4-170 ear clamp
.
Which clamp fits the Mercury OEM 5/16" hose?
Use the
Oetiker 4-145 ear clamp
.
Why do all three 5/16" hoses use different clamps?
The 5/16" measurement refers to the inside diameter. Each hose has a
different construction and outside diameter, so each requires the correct
clamp matched to that hose.
Which direction should the primer bulb be installed?
Install it with the fuel-flow arrow pointing toward the engine.
What tool is used to install Oetiker clamps?
Use the
Oetiker Standard Jaw Pincer Tool
.
Do you sell a clamp assortment?
Yes. The
Oetiker Clamp Pack with Tool
includes common clamp sizes and the installation tool.
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 in the continental U.S.
- 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, unused and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help choosing the correct fuel-line parts?
Contact Pro Marine
Phone: 941-721-3000
Searchable Part Numbers & Terms
8004, Pro Marine 8004, 5/16 primer bulb, 5/16 marine primer bulb, outboard primer bulb, boat fuel primer bulb, marine fuel bulb, outboard fuel bulb, 5/16 fuel line, 5/16 outboard fuel hose, 315-056, MPI 315-056, 5/16 Type B fuel hose, 313-1, MPI 313-1, 5/16 Type A fuel hose, Mercury fuel hose 100, Mercury 5/16 silver fuel hose, Oetiker 4-153, Oetiker 4-170, Oetiker 4-145, marine fuel line clamp, Oetiker fuel line clamp, primer bulb fuel line, marine fuel system, outboard fuel line
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766488
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