Mercedes Mullins
The fuel line size for a 70 Horse Johnson engine depends on the section of the fuel line being considered. From the pump to the elbow, a 5/16 hose is used, while a 5/32 hose is used from the tee to the carbs. The supply hose to the primer solenoid is 1/16. It is important to note that the fuel lines are sized for flow and not pressure, so you will still have pump pressure output at each hose but with reduced flow.
| Characteristics | Values |
|---|---|
| Carb fuel line size | 5/32" |
| Hose size from pump to elbow | 5/16" |
| Hose size tee to tee and to carbs | 5/32" |
| Supply hose to primer solenoid size | 1/16" |
| Fuel line routing | From the pump to the middle carb, then branched off to each carb |
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What You'll Learn
- The Johnson Evinrude Fuel Line Assembly is a durable and reliable connection between the fuel tank and engine
- The 5/32 hose is the correct size for the fuel line
- The fuel line runs from the pump to the elbow, then to the carbs
- The supply hose to the primer solenoid is 1/16
- The BRP website provides diagrams for routing fuel lines
The Johnson Evinrude Fuel Line Assembly is a durable and reliable connection between the fuel tank and engine
The Johnson Evinrude Fuel Line Assembly is a high-quality solution for boaters who need to securely connect their fuel tank to their engine. It is built to last, with tough construction and reliable performance. The fuel line is made from sturdy materials that can withstand the challenges of the marine environment.
The assembly's solid construction and user-friendly design make it a top choice for those seeking a dependable and efficient fuel delivery system. It is a hassle-free option for quick and easy installation, ensuring a snug fit with no leaks. The pre-connected fuel fitting is compatible with both Johnson and Evinrude engines.
The Johnson Evinrude Fuel Line Assembly is available in various sizes, including 3/8" ID 7' long fuel hose and 5/16" 8ft hose. It is important to select the correct size to ensure a secure fit and optimal performance. The assembly is known for its durability, with customers praising its leak-free performance and sturdy construction.
The Johnson Evinrude Fuel Line Assembly is a trusted choice for boaters seeking a durable and efficient connection between their fuel tank and engine. Its robust materials and user-friendly design make it a reliable solution for marine applications. With its easy installation and compatibility with Johnson and Evinrude engines, it is a popular option for those seeking a high-quality fuel line assembly.
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The 5/32 hose is the correct size for the fuel line
When it comes to the correct fuel line size for a 70 horsepower Johnson engine, it is important to consider the specific year and model of the engine, as well as the particular application of the fuel line within the fuel system. In the case of a 1989 Johnson 70 horsepower engine, the recommended fuel line size is 5/32 inches, or 772571 by part number. This size is specifically mentioned in the context of the smaller carb fuel lines at the "T"s for the carbs and primer solenoid.
It is worth noting that the fuel hose requirements may have evolved over time to meet federal standards, and newer engines may have different specifications. Therefore, it is always advisable to consult official sources, such as the manufacturer's website or authorized dealers, for the most accurate and up-to-date information regarding fuel line sizes and recommendations.
The 5/32-inch hose is indeed the correct size for the specified application within the fuel system of the 1989 Johnson 70 horsepower engine. This size is important to ensure proper fuel flow and engine performance. Using a hose that is too large or too small can result in restricted fuel flow, which can lead to engine performance issues and potential damage over time.
Additionally, it is worth mentioning that fuel hose selection is not just about the inner diameter (size) but also about the type of hose and its compatibility with the specific fuel type and environmental conditions. In marine environments, for example, fuel hoses need to be durable and resistant to saltwater, sunlight, and other harsh conditions. Consulting experts or mechanics familiar with Johnson engines and their specific fuel system requirements can provide valuable insights and ensure the correct fuel line choices.
In summary, the 5/32-inch hose is the correct size for the fuel line in the specific application mentioned for the 1989 Johnson 70 horsepower engine. However, it is always important to consider the broader context, including the year and model of the engine, federal standards, and the unique characteristics of the fuel system and operating environment.
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The fuel line runs from the pump to the elbow, then to the carbs
The fuel line for a 70-horse Johnson outboard motor has specific requirements. The routing of the fuel line is from the pump to the elbow, then to the carbs. This is a common query, with many people seeking advice on the correct fuel line setup for this engine.
Firstly, it is important to note that the fuel line from the pump to the elbow should be a 5/16" hose. This is a standard size and can be sourced from marine suppliers or auto parts stores.
The next section of the fuel line, from the elbow to the carbs, requires a 5/32" hose. This smaller diameter hose is necessary to ensure the correct flow of fuel to the engine. It is worth noting that this size can be more challenging to source, and some auto parts stores may not carry it. However, it can be purchased online or from specialist marine suppliers.
The 5/32" hose is also required for the supply line to the primer solenoid. This line is essential for the proper functioning of the engine's fuel system.
It is worth mentioning that the fuel lines are sized for flow and not pressure. This means that even with the smaller diameter hoses, the pump will still deliver sufficient fuel to the engine. The user should be aware of the potential for leaks, as some fittings may require additional sealing or adjustment to prevent fuel from escaping.
The routing of the fuel lines can be complex, and it is recommended to refer to a diagram or seek advice from a marine mechanic or a forum to ensure the correct setup. The specific model number of the engine will also determine the exact routing and any unique requirements.
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The supply hose to the primer solenoid is 1/16
When it comes to fuel lines for a 70 horsepower Johnson engine, there are a few things to consider. Firstly, it's important to source the correct fuel lines for your specific engine model and year. For instance, the 1981 Johnson 70 HP engine has a different fuel line setup from the 1989 Johnson 70 engine. The former has mechanically-activated choke plates in the carbs and no fuel primer hoses, while the latter has unique pre-bent hoses.
Now, regarding the primer solenoid and its supply hose, let's focus on the statement, "The supply hose to the primer solenoid is 1/16"." The primer solenoid plays a crucial role in introducing raw fuel directly into the intake area behind or after the carbs. Essentially, it acts as a small additional fuel pump. When the start button is pushed, electric power opens the fuel passage into the solenoid, and engine pulses activate this miniature pump.
The supply hose itself, measuring 1/16 of an inch, connects to one of the two small nipples on the primer solenoid. This particular nipple is responsible for receiving fuel from the diaphragm pump, which was initially activated by the first pump integrated into the solenoid. The received fuel is then sent onward to the carburetor, where it serves as the enrichener.
It's worth noting that the other small nipple on the primer solenoid also has a critical function. A hose connected to this nipple leads to the crankcase, providing the pump with energy by pushing air without any fuel. This dual-nipple setup ensures the primer solenoid's effective operation in delivering fuel to the engine.
In addition to the primer solenoid's supply hose, there are other unique hoses to consider for your 70 horsepower Johnson engine. These include hoses with specific part numbers, such as 333630, 334424, 332826, and 333382. Bombardier, a recommended dealer, offers these special hoses, which are designed to navigate tight corners without restricting fuel flow.
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The BRP website provides diagrams for routing fuel lines
For a 70 horsepower Johnson engine, the fuel line size is 5/32". This is the case for both the 1989 model and the 1981 model. The 1989 model has a part number of 772571. The 1981 model has part numbers 0319733, 0327228, and 0772571.
The fuel line must be routed correctly to avoid kinking or pinching, which can cause a reduction in fuel output and potential engine damage. When routing the fuel line, it is important to consider the bends required in the hose. A bulk hose will kink when bent into a tight radius and restrict fuel flow. Special application hoses are heated at the factory to bend around tight corners while maintaining correct fuel flow.
Fuel line routing diagrams are available for a variety of engines and vehicles, including 2-stroke and 4-stroke engines, Chevy 350, Silverado, GMC Sierra, Duramax, C10, Lexus LS600, Mazda MPV, Mercedes E320, Volkswagen Beetle, GMC Jimmy, Jaguar XJS, Ford F250 and F350, and Nissan Sentra.
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Frequently asked questions
The fuel line sizes for a 70 HP Johnson vary depending on the location. From the pump to the elbow, a 5/16" hose is used, while a 5/32" hose is used from the tee to the carbs and a 1/16" hose for the supply hose to the primer solenoid.
Yes, pre-bent hoses are available for the 70 HP Johnson engine and are necessary to avoid kinking and restricting fuel flow.
The part number for the 5/32" fuel line is 772571, which replaced the previous part numbers 0327228 and 0319733.
The fuel line routing for a 70 HP Johnson typically involves running a line from the pump outlet to a tee, which then branches off to each carb. However, specific configurations may vary.
Yes, the Johnson Evinrude Fuel Line Assembly from T-H Marine is compatible with Johnson engines and provides a reliable and efficient fuel delivery system.
