Ameer Randolph
The 1986 Evinrude 175 is an outboard motor that has been known to overheat. While there are various reasons for this, it is recommended that you check the water-cooled rectifier/regulator under the flywheel. It is also important to check the flywheel magnets, as they may loosen up when fires occur. In terms of the fuel line size, it is likely to be 5/16 to the fuel pump and 1/4 to the carbs. However, it is recommended to use a 3/8 fuel line for engines above 115 HP.
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What You'll Learn
The fuel line size is likely 1/4 to the carbs and 5/16 to the fuel pump
The fuel line size for a 1986 Evinrude 175 is likely to be 1/4" to the carbs and 5/16" to the fuel pump. This is a common size for older Evinrude engines, and while it may vary depending on the specific model and year, this is a good starting point.
It's important to note that the fuel line size can vary between different engines, even within the same brand. For example, a 1988 Evinrude SPL may use a 5/16" hose, while a 1985 J 140 [V4] uses 3/8" lines. The engine's horsepower can also be a factor, as any engine above 115 HP typically requires a 3/8" fuel line.
When determining the correct fuel line size, it's always best to refer to the engine's manual or consult with a certified technician. Using the wrong fuel line size can affect fuel delivery and engine performance. It's also crucial to use fuel hose and nothing else when making substitutions.
Additionally, ensuring a tight connection at the points of fuel line hook-up is essential to prevent air leaks, which can cause the engine to lose prime. A loose fuel line can lead to problems, so it's worth taking the time to get it right.
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A 3/8 fuel line is also suitable
A 3/8 fuel line is suitable for a 1986 Evinrude 175. The general rule of thumb is that any engine that is above 115 HP requires you to use a 3/8" fuel line. This is because a smaller fuel line slows down fuel delivery as it cannot get enough volume through. The flow of fuel into the carbs is controlled by the float/needle in the bowl.
The fuel line size for an engine can be determined by looking at the hookup on the engine. Wherever you hook up the fuel line on the engine, there will be a hose barb. If it is a 5/16" or a 3/8" hose barb, that is what you should use. It is important that the connection is tight to prevent air leaks, which can cause the engine to lose prime.
It is normal for the hoses to be two different sizes, and it is recommended to use 5/16" hose from the tank to the primer bulb, and 3/8" from the bulb to the engine. This is because the flow of fuel into the carbs is controlled by the float/needle in the bowl, and a 5/16" hose will be sufficient for the fuel flow from the tank to the primer bulb.
It is always better to go a bit larger than smaller when it comes to fuel lines, as long as it is not too large for the hose barb, to ensure sufficient fuel flow and prevent the engine from bogging down.
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A 5/16 hose is recommended by some
A 5/16" hose is also used for an Evinrude 48 hp and 70 hp engine, as well as an Evinrude 4 hp and 115 hp engine.
However, it is worth noting that a 3/8" hose is recommended for engines above 115 HP, and an 85 J 140 V4 engine uses 3/8" lines per the manual. Therefore, it is always best to check the manual or the hookup on the engine, as the hose barb will indicate whether a 5/16" or 3/8" hose is required.
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A 5/16 fuel line is used for engines up to 115 HP
A 5/16" fuel line is typically used for engines up to 115 HP. This is a general rule of thumb that applies regardless of the manufacturer of the engine, be it Honda, Mercury, Yamaha, Suzuki, Tohatsu, Nissan, or Johnson/Evinrude.
The 5/16" size is perfect for smaller outboards, as well as sailboat outboard engines and kicker motors. It is also suitable for small engine work, offering good value for money due to its sturdy and flexible design. The 5/16" fuel line is made of high-quality NBR material, which is durable, oil-resistant, and temperature-resistant. It can be used with gasoline, diesel, biodiesel, engine oil, and water.
However, for engines above 115 HP, a 3/8" fuel line is required. This is because larger outboards, 150 and above, demand more fuel to run at higher RPMs. Using a 5/16" fuel line with these larger outboards will cause the engine to run lean, putting massive strain on the fuel pumps and potentially damaging the powerhead of the engine.
Therefore, it is important to use the correct size fuel line for your engine to ensure optimal performance and avoid any potential issues or damage.
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A 3/8 fuel line is used for engines above 115 HP
The size of a fuel line for a 1986 Evinrude 175 engine is not publicly available. However, a general rule of thumb for outboard engines is that engines above 115 HP require a 3/8" fuel line. This is because engines with higher horsepower have greater fuel demand.
It is important to note that using a smaller fuel line can slow down fuel delivery as the fuel pump may not be able to keep up with the demand. Therefore, it is recommended to use a 3/8" fuel line for engines with higher horsepower, such as the 1986 Evinrude 175, to ensure optimal performance.
Additionally, when connecting the fuel line to the engine, ensure that it is tight and secure. A loose fuel line can cause an air leak, leading to problems such as the engine losing prime. By following the general guideline of using a 3/8" fuel line for engines above 115 HP, you can maintain the optimal fuel flow and performance for your 1986 Evinrude 175 engine.
It is worth mentioning that some sources suggest using a 5/16" fuel line for 3-cylinder engines and below, and a 3/8" fuel line for V4 and above. However, it is always recommended to refer to the engine manual or seek advice from a certified technician to ensure the correct fuel line size for your specific engine.
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Frequently asked questions
You will need a 5/16" fuel line. This is the standard size for engines with 3 cylinders or below.
Yes, a 3/8" fuel line will work but is not necessary. A 5/16" fuel line is sufficient.
You can purchase fuel lines from boating forums such as iboats, or from marine suppliers like Crowley Marine.
The fuel line size is likely to be 5/16" to the fuel pump and 1/4" to the carbs.
The fuel line size is 5/16", although some sources suggest a 3/8" line is also suitable.
