Mercedes Mullins
The fuel line size of a 1979 Sportster is a topic that has been discussed on various motorcycle forums, with some users recommending a 1/4 fuel line size for bikes from 1979 to 1985. However, other users have mentioned using a 5/16 fuel line size for their older Sportster models, and some have suggested that the stock fuel line size for bikes with larger jets should be 1/4, with the option to switch to 5/16 for increased fuel flow. Clear fuel lines have also been mentioned, but these are not recommended due to their tendency to harden and crack over time.
1979 Sportster Fuel Line Characteristics
| Characteristics | Values |
|---|---|
| Recommended fuel line size | 1/4" |
| Other possible fuel line size | 5/16" |
| Hose size from petcock to carb | 1/4" |
| Pingel petcock hose size | 5/16" |
| Hose clamp size at the carb inlet and petcock | 5/16" |
| Stock fuel line size | 1/4" |
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What You'll Learn
The recommended fuel line size for 1979-1985 Sportsters is 1/4
Some people opt for a larger 5/16" fuel line, which is a common size in aftermarket products. However, a larger line is only necessary if your bike has larger jets. A 1/4" line will provide enough fuel flow for a 6.40mm total jet. It is also possible to get a 1/4" line over a 5/16" spigot, so sizing is flexible.
If you are unsure about the size of your fuel line, you can take it off and compare it to lines at an auto parts store. You can also measure it and order a new one. It is important to use a line rated for gasoline, as the basic rubber hoses can dissolve from the chemicals in the fuel.
It is also worth noting that clear fuel lines can harden and become susceptible to cracks over time. They also tend to kink when sharp bends are made.
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Some people use 5/16 fuel lines for their 1979 Sportster
One user noted that they had to replace their fuel line and used the 5/16 size, securing it with hose clamps at the carb inlet and petcock to prevent leaks. They noted that without the hose clamps, they noticed some dripping fuel. This is an important consideration when choosing a fuel line size, as a looser fitting line may require additional parts to ensure a secure fit.
Another user noted that they used a 5/16 black fuel line, which was cheap and readily available. They also noted that it was easy to cut to length, which is an important consideration when replacing a fuel line. It is important to ensure that the fuel line is not too tight or too loose, as this can cause damage to the line or leaks, respectively.
The Pingel petcock, for example, uses a 5/16" hose, but some users have noted that this size is too loose for the carb inlet, and a 1/4" hose is needed instead. In this case, a reduction coupler can be used to run the 5/16" hose to the petcock. It is important to consider the fittings and parts available when choosing a fuel line size to ensure a secure and safe fit.
While some people have used the 5/16 size successfully, it is important to note that the recommended size for 1979 bikes is 1/4". It is always best to follow the recommended size to ensure the best fit and performance. However, in some cases, a different size may be preferred or required due to various reasons, such as parts availability or personal preference.
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The hose from the petcock to the carb is 1/4
When replacing the fuel hose on a motorcycle, it is important to consider the size of the hose. The hose should be tight-fitting to prevent fuel leaks, but not too tight that it damages the line. In some cases, a reduction coupler may be needed to connect a larger hose to the petcock.
The petcock is a valve that controls the flow of fuel from the tank to the carburettor. It is an important component of the fuel system, as it helps to prevent fuel leaks and ensures that the engine receives the correct amount of fuel.
The carburettor is the part of the engine that mixes air and fuel to create the perfect mixture for combustion. It is essential that the carburettor receives the correct amount of fuel, as too much or too little fuel can cause the engine to run poorly or not at all.
When working on the fuel system of a motorcycle, it is important to exercise caution and ensure that all connections are secure to prevent leaks. Leaking fuel can be a fire hazard, so it is always best to err on the side of caution and ensure that all hoses and connections are in good condition and properly fitted.
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Some petcocks use a 5/16 hose
The recommended fuel line size for 1979 Sportster bikes is 1/4". However, some petcocks use a 5/16" hose.
Petcocks, or pet cocks, are inline fuel shut-off valves that control the flow of gas to the engine. Proper gas flow is essential to the engine performance of a motorcycle. If the fuel line is too tight, it can be difficult to install without damaging the line. A looser fuel line can also cause issues, potentially leading to leaks.
When replacing a fuel line, it is important to use a hose that is specifically designed for gasoline. Vacuum line, for example, is not suitable as it is not made for gas and will cause problems when it dissolves from the chemicals in the fuel.
There are a variety of petcocks available on the market, with different sizes and specifications. Some petcocks have a 5/16" diameter hose barb on one end and a fuel filter on the other, and these typically use a 1/4" fuel line for a snug, leak-proof fit. It is important to ensure that the correct size hose is used with the petcock to prevent leaks and ensure optimal engine performance.
In some cases, it may be necessary to use a reduction coupler to connect a 5/16" hose to the petcock if the standard size is too large. This allows for a secure connection and helps to ensure a leak-proof system.
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The Pingel petcock uses a 5/16 hose
The Pingel petcock is a popular choice for Sportster owners as it offers a more compact installation compared to other petcocks on the market. It is designed to fit 22mm bungs on OEM gas tanks and, being made from solid brass, is a durable option.
When replacing the fuel line on a Sportster, it is important to use a hose that is rated for gasoline. Basic rubber hoses should be avoided as they can dissolve from the chemicals in the fuel. Gasoline-rated hoses come in a variety of colours, including black, clear, and various solid and translucent colours.
To ensure a tight fit and prevent leaks, some Sportster owners recommend using hose clamps at the carb inlet and the petcock. This is especially important when using a larger 5/16" hose on an inlet designed for a 1/4" hose. In some cases, a reduction coupler may be necessary to connect the hose to the carb inlet.
Overall, the Pingel petcock is a reliable option for Sportster owners looking for a compact and durable fuel valve. With its 5/16" hose, it offers a secure and leak-free connection, providing peace of mind on the road.
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Frequently asked questions
The recommended size for 1979-1985 Sportster bikes is 1/4".
You should use a fuel line, not a vacuum line.
You can buy a fuel line at an auto parts store.
Clear fuel lines are not recommended as they harden over time, are susceptible to cracks, and can kink.
Yes, a 5/16" fuel line will fit, but the recommended size is 1/4".
