Regan Brown
When it comes to fuel lines, the general consensus is that 3/8 fuel lines are the best option for both feed and return lines. This is the size recommended by FiTech themselves for their kits, which use Twist-Lock type fuel fittings. However, some people have used 5/16 return lines with no issues, especially if the fuel pump is not heavily oversized. It is worth noting that if you have a higher horsepower vehicle, you may need a larger fuel line - for example, one source recommends a 3/8 line for 450-640 hp and a 1/2 line for above 650 hp.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Feed and Return Fuel Line Size | 3/8" (recommended by FiTech) |
| Alternative Fuel Line Size | 5/16" (can be used but may require fuel pressure gauge to ensure pressure does not exceed 60 psi) |
| Fuel Line Recommendation Based on HP | 5/16" up to 450 hp, 3/8" for 450-640 hp, 1/2" above 650 hp |
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What You'll Learn
Fuel line size depends on HP
Fuel line size is an important consideration when it comes to achieving optimal performance in your vehicle, especially when dealing with high-horsepower applications. The relationship between fuel line size and horsepower is a delicate balance, as having a line that is too small or too large can impact performance.
A fuel line that is too narrow can restrict fuel flow and hinder your ability to reach your desired horsepower. For instance, a 5/16" return line is typically sufficient for engines up to 300-450 HP, but for higher horsepower applications, a larger line may be necessary. On the other hand, a fuel line that is excessively large can also cause issues. While it may not directly impact performance, it can result in unnecessary costs and complexity. Therefore, it is crucial to select the appropriate fuel line size to match your horsepower goals.
The general rule of thumb is that a 5/16" fuel line is suitable for up to 450 HP, a 3/8" line for 450-640 HP, and a 1/2" line for above 650 HP. However, it's important to note that these are just guidelines, and the actual requirements may vary depending on other factors in your setup. For example, a 3/8" fuel line can support over 600 HP with sufficient "pump head", and a larger pump can further increase the horsepower capacity.
Ultimately, the key factor in achieving sufficient fuel supply is pumping power. A more powerful pump can compensate for a smaller line size, and vice versa. Therefore, it is important to consider the interplay between fuel line size, horsepower, and pump capacity when designing your fuel system. Installing a fuel pressure gauge can help you determine if your setup is adequate, as it will indicate whether the pressure is within the desired range.
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5/16 fuel line as a return line
The 5/16" fuel line is commonly used as a return line for Fitech fuel systems. However, it is important to note that the suitability of this size depends on various factors, including the type of pump, fuel type, number of g-forces pulled in a straight line, and the presence of sharp bends or other restrictions in the line.
Some users have reported using the 5/16" fuel line as the return line on their Fitech systems without any issues. They suggest that a smaller return line is adequate unless the fuel pump is significantly oversized compared to the bypass regulator setting. This is because the return flow is only the excess pressure produced by the fuel pump, as measured by the fuel pressure setting of the bypass fuel regulator.
On the other hand, some sources recommend a larger 3/8" return line for Fitech systems, as specified in their product instructions and by their support team. This discrepancy has caused confusion among customers, who have purchased 5/16" lines based on the instructions only to be later informed that the correct size is 3/8".
When considering the appropriate fuel line size for a return line, it is generally recommended to take into account the horsepower (HP) of the engine. According to one source, a 5/16" line is suitable for up to 450 hp, while a 3/8" line is recommended for 450 to 640 hp, and a 1/2" line is suggested for above 650 hp.
It is worth noting that some users have experienced issues with the 5/16" line when using mechanical pumps and pump gas, particularly with higher horsepower levels. In such cases, it is recommended to use a larger 3/8" or 1/2" line to accommodate the increased fuel demand and prevent potential performance problems.
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3/8 fuel lines for feed and return
When it comes to fuel lines for feed and return, one of the most common sizes is 3/8". This size is often used in various automotive applications, including in Fitech fuel systems.
There are a few important considerations when choosing to use 3/8" fuel lines for feed and return. Firstly, it is essential to ensure that the fuel lines are compatible with the specific engine and fuel system configuration. While 3/8" fuel lines can support a significant amount of horsepower, there may be cases where higher horsepower applications require larger fuel lines, such as 1/2". It is always best to consult with a professional or refer to manufacturer recommendations for the specific engine and fuel system in question.
Another factor to keep in mind is the potential for increased fuel pressure when using 3/8" fuel lines. If the return line is restricted, it can lead to higher fuel pressure. This issue can sometimes be mitigated by using an adjustable fuel pressure regulator or ensuring that the fuel pump is not heavily oversized for the fuel lines. Additionally, the type of pump can play a role, with electric pumps that push the fuel possibly handling it better than mechanical pumps.
It is worth noting that some Fitech users have reported using 3/8" return lines without any issues, while others have mentioned that Fitech instructions sometimes show a smaller 5/16" return line as an option. To ensure the correct size, it is recommended to contact Fitech support or refer to their most up-to-date documentation.
In conclusion, 3/8" fuel lines for feed and return can be a suitable option for many applications, but it is important to consider the specific requirements and characteristics of the engine and fuel system in question. Consulting with professionals or experienced individuals in automotive forums can provide valuable insights and ensure that the correct fuel line size is selected to avoid potential issues.
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Fuel pressure gauge and fuel pump
Fuel pressure gauges are an important tool for maintaining the proper functioning of your fuel pump and engine. If the fuel pressure is off, it can cause injection pump failure or even engine failure. Therefore, it is important to monitor your fuel pressure to ensure your fuel system is running at peak performance levels.
GlowShift offers a variety of fuel pressure gauges that deliver accurate analog or digital readings up to 100 PSI. These gauges come with everything required for installation, including fuel pressure sensors, wiring harnesses, and hardware. The included 1/8-27 Electronic Fuel Pressure Sensor can be installed on your fuel filter housing, fuel pump, or fuel rail.
To ensure the proper functioning of your fuel pump, it is important to maintain the correct fuel pressure levels. Low fuel pressure can result in rough idling, poor performance, and decreased fuel economy, while high fuel pressure can lead to a rich air-to-fuel ratio, causing black exhaust and high emissions that can damage your fuel system.
Regarding the size of the feed and return fuel lines for Fitech, there seems to be some discrepancy in the recommendations. Some sources suggest that a 5/16" return line is sufficient, while others recommend a 3/8" line. The recommendation may depend on the specific Fitech system and its horsepower. For example, one source mentions that a 5/16" line is recommended for up to 450 hp, while 3/8" is recommended for 450-640 hp. It is always best to refer to the manufacturer's instructions and specifications to ensure the correct size is used.
In summary, fuel pressure gauges and fuel pumps are critical components of a vehicle's fuel system. Proper fuel pressure levels must be maintained to ensure optimal engine performance and prevent potential damage. When it comes to Fitech fuel lines, it is important to consider the specific system and horsepower requirements to determine the appropriate size for the feed and return lines.
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Fuel line connectors and fuel filters
The size of the feed and return fuel lines for a Fitech system depends on the horsepower of the engine. According to one forum post, a 5/16 fuel line is sufficient for up to 450 hp, while a 3/8 fuel line is recommended for 450–640 hp, and a 1/2 fuel line is recommended for above 650 hp.
Another important consideration is the fuel pressure. If the pressure at the Fitech fuel inlet goes much above the regulator-rated pressure, the fuel line may be too small. This can be checked with a fuel pressure gauge.
Fitech's support team recommends a 3/8 return line. However, some users have reported using a 5/16 return line with no issues, especially if the fuel pump is not heavily oversized. It is worth noting that Fitech's instructions have been reported to show a 5/16 return pipe as an option, which conflicts with their recommended 3/8 return line.
Fitech offers a range of fuel delivery kits, such as the 50001 Go EFI In-Line Frame Mount Fuel Delivery Kit, which includes 40 feet of EFI-grade fuel hose suitable for both the inlet and return lines between the fuel tank and the engine. This kit also includes two billet fuel filters: a 100-micron pre-filter and a 10-micron post-filter. Fitech also offers fuel plumbing kits in black braided stainless steel, which include a 40-micron filter and a check valve.
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Frequently asked questions
Fitech recommends using 3/8" fuel lines for both the feed and return lines. If you have an existing 5/16" line, you can use it, but you should hook up a fuel pressure gauge and ensure the pressure does not exceed 60 psi.
Fitech kits use Twist-Lock type fuel fittings.
Yes, a 30 to 10-micron fuel filter is required between the pump and the throttle body. Fitech kits include a washable 30-micron high-pressure EFI filter.
