Ameer Randolph
The best placement for an inline fuel filter in a Shovelhead is a topic of debate. Some sources suggest placing it between the pump and the carburetor, while others recommend mounting it as far out as possible, but not near or between the cylinders to avoid vapor lock. One user reported that their inline fuel filter drained faster than it should have, and they were advised to check the filler cap for proper venting and ensure that the carb float/valve is not sticking or blocked. Another user recommended a metal filter from an auto parts store, while others suggested specific products such as a Mallory fuel filter or a Fram filter. The correct routing of the fuel line is also important to ensure it doesn't get too hot and cause vapor lock.
Characteristics and Values Table for Inline Fuel Filter Shovelhead
| Characteristics | Values |
|---|---|
| Location | Between the carburetor and pump |
| Filter Type | Fram filter, Mallory fuel filter, metal filter, automotive filter, glass in-line fuel filter |
| Filter Placement | Near the gas tank, outside the tank on the suction side, under the car, between the engine and the squeeze bulb |
| Hose | Use a hard line, avoid glass with rubber hoses, keep the hose off the engine |
| Other | Use a fuel cutoff valve for safety, avoid vapor lock by keeping the fuel line high and tied off in the middle |
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What You'll Learn
- The best place for an inline fuel filter is between the pump and carburetor
- The filter should be placed before the carb to ensure clean fuel
- Avoid putting the filter on the suction side of the fuel pump
- A metal filter can be purchased for around $5
- The fuel line should be held away from the engine with a wire standoff
The best place for an inline fuel filter is between the pump and carburetor
It is not recommended to put a filter on the suction side of the fuel pump. This is because the filter needs to be between the pump and the carburetor to ensure that contaminants are filtered out before reaching the carburetor.
Some people choose to put the inline fuel filter near the gas tank, either in the engine compartment or under the car. This is usually done for cosmetic reasons, as filters can stand out and ruin the look of the engine. However, this setup may make it harder to inspect the filter.
It is also important to keep the fuel line up high and tied off in the middle to prevent it from getting too hot and causing vapor lock. Additionally, the hose should be kept off the engine, and a wire standoff can be used to hold the line away from the jugs.
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The filter should be placed before the carb to ensure clean fuel
The inline fuel filter in a shovelhead should be placed before the carburettor to ensure a consistent supply of clean fuel to the engine. This is the ideal location for the filter as it ensures that the fuel entering the carburettor and, subsequently, the engine, is free of contaminants.
While some mechanics and enthusiasts may argue that an inline fuel filter is unnecessary, and that other methods, such as tank lining, are sufficient to prevent issues, an inline filter provides an additional layer of protection. Rust, for example, can be a common issue in fuel tanks, and an inline filter helps to catch any rust particles before they reach the carburettor.
Placing the inline fuel filter before the carburettor also helps to simplify the fuel system's design. By locating the filter in this position, you avoid the need for complex routing, which can be necessary to keep the fuel line cool and prevent issues like vapor lock. A simpler fuel line design can also be easier to maintain and inspect, as there are fewer components to monitor and fewer potential points of failure.
Furthermore, by placing the inline fuel filter before the carburettor, you can more easily access and replace the filter when needed. This location provides better accessibility compared to placing the filter near the fuel tank, for example, which can make inspection and maintenance more challenging.
While some may opt to place the filter in a more concealed location for cosmetic reasons, considering functionality and ease of maintenance, placing the inline fuel filter before the carburettor is generally the best practice to ensure clean fuel and proper engine performance.
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Avoid putting the filter on the suction side of the fuel pump
The inline fuel filter in a motorcycle engine should ideally be placed between the fuel pump and the carburetor. This ensures that the carburetor receives clean fuel.
However, it is important to avoid putting the filter on the suction side of the fuel pump, which is the inlet side. This is because any inline restriction on the inlet side will cause the fuel to boil in the line, creating vapour lock. Vapour lock occurs when a pump cannot move fuel that has even minor bubbles in it. Mechanical fuel pumps rarely get clogged with dirt, and the filter is primarily needed to protect the carburetor.
Additionally, placing the filter on the suction side of the pump may cause a vacuum to build up in the tank, preventing the fuel from flowing. This is due to the vents in the fuel tank becoming clogged, which can happen more easily when fuel demand is high.
Therefore, it is recommended to place the inline fuel filter on the pressure side of the pump, away from any heat sources, to avoid potential issues with fuel delivery.
It is also important to regularly check the fuel pump and filter for any issues, as problems with either component can cause the engine to malfunction.
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A metal filter can be purchased for around $5
Metal filters are known for their durability and corrosion resistance, making them a popular choice among Shovelhead owners. They are designed to withstand the high temperatures and pressures present in the fuel system, ensuring that the filter does not fail or break down over time. This type of filter is also effective at removing contaminants from the fuel, ensuring that the engine receives clean fuel for optimal performance.
One option for a metal filter is the Pura-Flow universal oil filter kit, which includes a bracket, oil filter, and hose. This kit is designed to fit a variety of motorcycle models, including the Shovelhead. It features a finned design for efficient heat dissipation and is imported, ensuring high quality and performance.
Another option is the OEM No: 63800-48 oil filter assembly, which features a polished top and chrome body. This filter assembly is designed to fit Harley-Davidson Shovelhead models from 1948 to 1964. It includes all the necessary internal parts, and the hose fittings can be easily substituted to accept a metal line.
By choosing a metal filter, Shovelhead owners can benefit from a durable, reliable, and cost-effective solution to ensure their fuel system remains free of contaminants and performs at its best. With proper maintenance and care, a metal filter can last for many years, providing peace of mind and helping to extend the lifespan of the engine.
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The fuel line should be held away from the engine with a wire standoff
When installing an inline fuel filter on a shovelhead, it is important to consider the placement of the fuel line. The fuel line should be held away from the engine with a wire standoff to prevent it from touching the engine's heads and causing potential issues. This setup helps to maintain the integrity of the fuel line and ensures that it does not get damaged by the heat generated by the engine.
The wire standoff serves as a crucial component in this arrangement. It acts as a physical barrier, creating a small gap between the fuel line and the engine. This separation is essential to mitigate the negative effects of the engine's heat on the fuel line. By holding the fuel line away from the engine, the wire standoff helps to prevent melting or degradation of the fuel line due to prolonged exposure to high temperatures.
Additionally, the wire standoff plays a significant role in promoting fuel efficiency and engine performance. By keeping the fuel line at a slight distance from the engine, the wire standoff helps regulate the temperature of the fuel. This is particularly important as fuel that gets too hot can vaporize, leading to issues such as vapor lock. Vapor lock occurs when fuel vaporizes prematurely, preventing the flow of liquid fuel to the engine, and potentially causing the engine to stall.
In the context of a shovelhead engine, maintaining proper fuel line placement is critical. Shovelhead engines are known for their air-cooled design, which can result in higher operating temperatures compared to liquid-cooled engines. As a result, the fuel line is more susceptible to the heat generated by the engine, underscoring the importance of utilizing a wire standoff to maintain the necessary distance between the fuel line and the engine.
The use of a wire standoff is a relatively simple yet effective solution to address the challenges posed by fuel line placement in shovelhead engines. It is a preventive measure that helps avoid potential issues such as fuel line damage, fuel vaporization, and engine performance problems. By employing this method, operators can ensure the longevity of their fuel lines and maintain the overall performance and reliability of their shovelhead engines.
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Frequently asked questions
The inline fuel filter should be placed between the pump and the carburetor. This ensures clean fuel to the carb.
Yes, some people prefer to put it near the gas tank under the car, or below the tank with a small billet type inline filter between the mech pump and carbs. However, the former option makes it a little hard to inspect.
Yes, you don't want to put a filter on the suction side of the fuel pump. Additionally, the fuel filter should not be placed near or between the cylinders as it will vapor lock.
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