Mercedes Mullins
The Evinrude E-TEC 200 HP engine is a powerful outboard motor that requires a fuel system to deliver fuel from the tank to the engine. The size of the fuel line is an important consideration, as using the wrong size can cause premature failure of the fuel pump and damage to the engine. The fuel line diameter for the 2007 Evinrude E-TEC 200 HP engine is recommended to be 3/8, as it is designed for engines with more than 115 HP. Smaller engines can use a 5/16 fuel line, but it is not suitable for the higher fuel demands of larger engines like the E-TEC 200. It is also important to consider the different types of fuel hoses and their specific applications, such as below or above the deck of the boat, to ensure the correct hoses are installed.
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What You'll Learn
Fuel line size depends on engine HP
Fuel line size is an important consideration when designing a fuel system, as it ensures the engine receives the proper amount of fuel without causing strain on the fuel pumps. The size of the fuel line depends on the engine's horsepower (HP) and the type of fuel used.
For outboard engines, a 5/16" fuel line is typically used for smaller engines up to 115 HP. This size is commonly found on sailboat outboard engines and smaller kicker motors. On the other hand, a larger 3/8" fuel line is required for engines above 115 HP. This size can easily support higher horsepower engines, even up to 600 HP with sufficient "pump head".
It's worth noting that the type of fuel also plays a role in fuel line sizing. For example, when using ethanol, which requires 30% more fuel than gasoline to generate the same HP, it is recommended to go one to two sizes larger than the gasoline requirement. Similarly, methanol, which requires double the amount of fuel than gasoline, will require a larger fuel line to accommodate the increased fuel demand.
In addition to the fuel line size, it's important to consider the different types of fuel hoses used in a fuel system. A1 hoses, for example, are used for feeding fuel from the boat fuel tank to the fuel filter bracket or the engine and have a fire-resistant covering. B1 hoses serve a similar purpose but are used above the deck and do not have fire-resistant protection. Understanding these specifications is crucial for safety purposes.
To summarize, the fuel line size depends on the engine's HP, and it's important to choose the right size to ensure optimal fuel delivery and engine performance. Additionally, the type of fuel and other factors, such as pumping power and fuel viscosity, can also influence the sizing decisions when designing a fuel system.
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5/16 fuel line for <115 HP
A 5/16" fuel line is suitable for outboard engines under 115 HP. It is the standard hose size for smaller engines, allowing the proper amount of fuel to reach the engine without issues. This size is also known as an A1 hose and is used for feeding fuel from the boat fuel tank to the fuel filter bracket or the engine. It has a fire-resistant covering on the outside and is designed to always contain fuel.
While a 3/8" hose will work for any outboard engine, most smaller outboards have fittings or quick-connects designed for the smaller 5/16" hose. The 5/16" hose is perfect for little kicker motors and sailboat outboard engines as it fits more easily into a smaller rigging tube.
However, it's important to note that the type of fuel line also depends on other factors, such as the type of pump, fuel, number of G-forces pulled in a straight line, and the number of sharp bends or restrictions in the line. For instance, with a mechanical pump and pump gas, a 5/16" line may cause issues with 350 HP or more due to fuel vaporization, especially in warmer temperatures. On the other hand, when using a high-pressure (12 psi or higher) electric pump, you can generally use a smaller fuel line.
Therefore, while a 5/16" fuel line is suitable for engines under 115 HP in outboards, the specific application and other factors should also be considered when choosing the appropriate fuel line size.
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3/8 fuel line for >115 HP
When it comes to fuel lines, size does matter. A 3/8" fuel line is required for engines with above 115 HP. This is because engines with higher horsepower will require more fuel to run at higher RPMs.
A 3/8" fuel line can support a significant amount of horsepower, with some estimates placing it at around 500-550 HP. However, it's important to note that the fittings and bends in the line can impact its effectiveness, and a big mechanical pump may not be suitable for a small line. An electric pump, on the other hand, can handle the fuel volume better.
Additionally, the type of fuel can also impact the flow rate. For example, when using alcohol, the flow rate needs to be doubled, and when using E85, the flow rate needs to be increased by around 30%.
To ensure sufficient fuel supply, pumping power is key. A larger pump, higher pump voltage, or a bigger line size can all help to increase the fuel pressure if it drops as the engine RPMs increase.
It's worth noting that a 3/8" fuel line can support up to 1000 HP with sufficient "pump head", according to some sources. This term refers to the amount of pressure or height that a pump can create, and it can be increased by using a bigger pump or higher voltage.
In summary, a 3/8" fuel line is suitable for engines with above 115 HP, and with the right pumping power, it can support a significant amount of horsepower. However, it's important to consider the fittings, bends, and type of pump to ensure optimal performance.
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A1 and A2 hoses for below deck
Marine-grade fuel hoses are specifically designed for boat use, taking into account their permeability and fire resistivity. A1 and A2 hoses are used for below-deck applications. A1 hoses are used for feeding fuel from the boat's fuel tank to the fuel filter bracket or the engine. They have a fire-resistant covering on the outside and are designed to have fuel in them at all times. A2 hoses are used for the fuel tank vent hose below the deck. They also have a fire-resistant covering but are not designed to have fuel sitting in the hose.
The "A" designator means the hose can be used in enclosed spaces, i.e., it passed a 2.5-minute fire test. The "1" suffix indicates that the hose is designed to have fuel in it all the time, i.e., it has low permeability. The "2" suffix indicates that the hose is not designed to have fuel in it all the time and has higher permeability.
It is important to note that there are different types of fuel hoses and different specifications for different applications put in place for safety purposes. The size of the fuel hose also matters, with the most common sizes being the 3/8” marine fuel hose and the 5/8” marine fuel hose, both suitable for gasoline engines. A 5/16” fuel line can be used for up to a 115 HP outboard engine, while a larger 3/8” fuel line is required for engines above that horsepower.
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B1 and B2 hoses for above deck
B1 and B2 hoses are used for above-deck applications. B1 hoses are used for feeding fuel from the boat's fuel tank to the fuel filter bracket. B2 hoses are used for the fuel tank vent hose. Both B1 and B2 hoses are not designed to have fuel sitting in them.
B1 and B2 hoses are not fire-resistant. This is an important distinction from A1 and A2 hoses, which are fire retardant and designed for below-deck applications.
It is important to understand the differences between the hoses that go below and above the deck of the boat to ensure the right hoses are used. For instance, a 5/16" fuel line can be used for up to a 115 HP outboard engine. A 3/8" fuel line is required for any engine larger than 115 HP.
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Frequently asked questions
A 3/8" fuel line is required for the 2007 Etec 200. This is because the engine is over 115 HP and therefore needs a larger fuel line to supply adequate fuel to the engine.
A 5/16" fuel line is typically used for smaller outboards, as it is perfect for little kicker motors and sailboat outboard engines. A 3/8" fuel line is required for engines over 115 HP as they need a larger supply of fuel to run at higher RPMs.
Fuel lines are used for feeding fuel from the boat fuel tank to the fuel filter bracket and the engine. They have a fire-resistant covering on the outside and are designed to have fuel in them at all times.
The fuel lift pump is a mechanical, pressure-pulse pump that uses vacuum pressure to pull fuel from the fuel tank. The fuel is then forced through the fuel filter and into the vapor separator, which cools the fuel and protects the system from water and contaminants.
