Mercedes Mullins
Yamaha outboard fuel lines are a common topic of discussion on boating forums. The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch. However, some users opt for a 5/16 inch line as this can keep more gas available at the engine. It's important to use Yamaha Marine Fuel lines, not automotive fuel hoses, and to replace the lines every other year.
| Characteristics | Values |
|---|---|
| Fuel line diameter | 1/4" or 5/16" |
| Original Yamaha fuel line diameter | 6mm |
| Fittings | Brass |
| Hose clamps | Available at Ace Hardware, True Value Hardware |
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What You'll Learn
- The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch
- You can also use a 5/16 inch hose
- Yamaha Marine Fuel lines are recommended over automotive fuel hoses
- You can buy brass fittings/hose barbs and hose clamps at Ace Hardware, True Value Hardware, and similar places
- Teflon Tape should not be used for fittings
The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch
You can also use a 5/16" fuel line, which is slightly larger and will keep more gas available at the engine. This size is suitable for up to a 115 HP outboard engine.
If you have an engine above 115 HP, you will need to use a 3/8" fuel line.
It's important to note that the Yamaha Marine Fuel lines are recommended for Yamaha outboard engines, rather than automotive fuel hoses.
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You can also use a 5/16 inch hose
The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch. However, you can also use a 5/16 inch hose. This is a good option if your tank sits close to the transom, as it will keep more gas available at the engine.
You can buy Yamaha Marine Fuel lines at stores like Ace Hardware and True Value Hardware. Make sure you use marine fuel lines, not automotive fuel hoses. It's also important to keep your fittings in good condition, as weather can cause them to deteriorate and create a loose fit.
When installing a fuel line, it's a good idea to keep a filter wrench and a spare filter on board. You should also regularly check the small gas filter on the side of the engine under the cowling.
Additionally, when using fittings, it's recommended to use White Teflon Pipe Compound, rather than Teflon Tape.
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Yamaha Marine Fuel lines are recommended over automotive fuel hoses
For a 25hp Yamaha outboard engine, a 1/4 inch fuel line is suitable, but a 5/16 inch line is also an option. The 5/16 inch line is better for longer distances, as it will keep more gas available at the engine.
For an outboard engine with a horsepower of up to 115, a 5/16 inch fuel line is suitable. For anything above 115 HP, a 3/8 inch fuel line is required.
It is important to use the correct size fuel line for your outboard engine. The wrong size can cause problems with fuel delivery to the engine.
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You can buy brass fittings/hose barbs and hose clamps at Ace Hardware, True Value Hardware, and similar places
The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch. You can also use a 5/16 inch hose, but it is recommended to use the larger of the two if your tank is far from the transom. You can buy brass fittings/hose barbs and hose clamps at Ace Hardware, True Value Hardware, and similar places. It is important to use Yamaha Marine Fuel lines, not automotive fuel hoses. You should also use White Teflon Pipe Compound, not the Teflon Tape, for fittings.
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Teflon Tape should not be used for fittings
The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch. However, some sources suggest that a 5/16 inch hose is also suitable. This size is perfect for smaller outboards and can be used in up to a 115 HP outboard engine.
Teflon tape is also not recommended for PVC, copper, or PEX pipe threading as these fittings often have a gasket or O-ring to create a seal between the two pipes. Additionally, avoid using Teflon tape on fluid power (hydraulic) systems and under brass's compression nut flare threads, or any other compression fitting type.
If you are using another type of threading sealant, like pipe dope compound, do not also use Teflon tape as using both can overload the threads and affect the seal.
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Frequently asked questions
The original Yamaha fuel line is a 6mm hose, which is just over 1/4 inch. You can also use a 5/16 inch hose.
You can buy the fuel line at hardware stores such as Ace Hardware and True Value Hardware.
You should use White Teflon Pipe Compound, not the Teflon Tape, for fittings. You should also make sure your fittings are good as the weather can deteriorate them and cause a loose fit.
