Upgrading your LS swap with the right fuel line is critical for reliable fuel delivery and safety. We researched and compared seven top options based on manufacturer specifications, industry standards, and aggregated owner feedback. Our evaluation highlights the strengths and weaknesses of each to help you choose the best line for your build.
| Photo | Product | Score | Buy |
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Russell Performance 640840 Best Overall AN -6 nylon braided hose, 250 psi working pressure, -40 to 300°F |
9.2 | 🛒 Check Price |
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Earl's Performance 632106ERL Premium Pick AN -6 PTFE lined hose, 300 psi working pressure, -65 to 450°F |
9.0 | 🛒 Check Price |
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Gates 27337 Best Value 3/8 inch rubber fuel injection hose, 50 psi working pressure, -40 to 257°F |
8.7 | 🛒 Check Price |
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Dayco 80255 Reliable Runner 5/16 inch rubber fuel line, 50 psi max, -40 to 257°F |
8.4 | 🛒 Check Price |
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Aeroquip AQP 1503 High Performance AN -6 AQP rubber hose, 300 psi working pressure, -40 to 300°F |
8.8 | 🛒 Check Price |
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Spectre Performance 3811 Budget Pick 3/8 inch rubber fuel line, 50 psi max, -40 to 212°F |
7.8 | 🛒 Check Price |
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Continental ContiTech 23635 Specialty Pick AN -6 rubber hose with push-on fittings, 200 psi working pressure, -40 to 250°F |
8.1 | 🛒 Check Price |
1. Russell Performance 640840: Best Overall
In our evaluation, the Russell Performance 640840 stands out for its balance of performance and reliability. The nylon braided construction offers high burst strength and resistance to ethanol-blended fuels, common in LS swaps. Owner feedback consistently praises its long-term durability under high-pressure fuel injection systems. The hose meets SAE J30R14 standards, giving confidence in its safety for street and track use.
However, this hose is not pre-assembled, so you will need AN fittings and a proper cutting tool. It may be overkill for low-pressure carbureted setups, and some users note that the nylon braid can be stiff in cold weather. If you prefer a ready-to-install kit or need a simpler solution, consider a pre-terminated option.
- High-quality nylon braided hose resists abrasion and fuel permeation
- Compatible with common AN fittings for easy custom routing
- Meets SAE J30R14 standards for fuel injection systems
Pros: Excellent durability and flexibility; Widely available fitting sizes
Cons: Requires careful measurement and cutting for a clean install
2. Earl's Performance 632106ERL: Premium Pick
For those seeking the highest level of protection, the Earl’s Performance 632106ERL uses a PTFE liner that virtually eliminates fuel permeation and withstands aggressive fuels. Our research shows that this hose is a top choice for high-horsepower LS swaps where fuel composition may vary. Owner feedback highlights its reliability in race environments and long service life.
The trade-off is cost and stiffness. PTFE hoses are less flexible than rubber or nylon, making routing more challenging. Additionally, specialized tools are needed to cut and assemble fittings. If your build is a daily driver with standard fuel, the extra expense may not be justified. We recommend this for high-performance or dedicated track vehicles.
- PTFE inner liner resists chemical degradation and fuel vapors
- Stainless steel braid provides superior abrasion resistance
- Meets SAE J30R14 and ISO 7840 standards
Pros: Extreme temperature and chemical resistance; Very low fuel permeation
Cons: More expensive than comparable nylon braided hoses
3. Gates 27337: Best Value
If you are on a budget or building a carbureted LS swap, the Gates 27337 offers a reliable solution at a lower cost. We found that this hose meets SAE 30R7 standards and is widely used in OEM applications. Owner feedback indicates it holds up well for years in low-pressure setups. Its flexibility makes routing in tight engine bays straightforward.
However, this hose is not designed for the high pressures of modern returnless fuel injection systems (typically 58 psi or more). Using it in such applications risks swelling and leakage. It also lacks the abrasion resistance of braided lines. Skip this if you need a high-pressure, long-term solution for a fuel-injected LS swap.
- Economical option for low-pressure fuel systems
- Resistant to ethanol and ozone
- Easy to cut and install with standard clamps
Pros: Very affordable; Simple installation with basic tools
Cons: Not suitable for high-pressure returnless systems
4. Dayco 80255: Reliable Runner
The Dayco 80255 is a solid choice for simpler LS swaps using a carburetor or low-pressure EFI. Our evaluation of owner feedback shows consistent satisfaction for its intended use. It is flexible and easy to work with, making it a favorite among DIY builders. The hose meets SAE 30R7 standards and resists ethanol blends.
However, its 5/16 inch diameter may be too small for high-flow applications. Also, the maximum working pressure of 50 psi is insufficient for returnless fuel systems common in later LS engines. If your swap requires a larger diameter or higher pressure, look elsewhere. We recommend this for basic builds where simplicity and cost are priorities.
- Good for low to medium pressure applications
- Resistant to fuel and oil
- Comes in convenient lengths
Pros: Dependable performance for the price; Easy to find at auto parts stores
Cons: Limited to 5/16 inch size, may not fit all fittings
5. Aeroquip AQP 1503: High Performance
For LS swaps that generate significant underhood heat, the Aeroquip AQP 1503 is a top performer. We researched its specifications and found that the AQP compound resists heat degradation better than standard rubber. Owner feedback from high-horsepower builds confirms its reliability. The aramid braid provides high burst strength, adding safety margin.
The main drawbacks are cost and stiffness. This hose is more expensive than rubber hoses and requires careful routing to avoid kinks. It also needs proper AN fittings and assembly tools. If your build is a mild street driver with moderate heat, the extra expense may not be necessary. We suggest this for high-performance or forced induction LS swaps.
- AQP rubber compound offers superior heat and oil resistance
- Aramid braid reinforcement for high burst strength
- Meets SAE J30R14 and TMC RP116B standards
Pros: Excellent heat resistance for engine bay use; Very durable and long-lasting
Cons: Stiffer than standard rubber hose, harder to route
6. Spectre Performance 3811: Budget Pick
The Spectre Performance 3811 is an entry-level fuel line suitable for low-pressure applications like carbureted LS swaps. In our evaluation, it works fine for temporary setups or low-budget builds. Owner feedback indicates it performs adequately when used within its limits. It is easy to install with standard worm-gear clamps.
However, this hose has a low maximum temperature rating and may become brittle over time under hood heat. It is not compatible with high-pressure returnless fuel systems and does not meet SAE J30R14 standards. We recommend it only for short-term or very low-budget projects. For a permanent, safe installation, invest in a higher-grade hose.
- Lowest cost option for basic fuel systems
- Flexible and easy to cut
- Resists gasoline and ethanol up to 10%
Pros: Very inexpensive; Readily available in various lengths
Cons: Not for high-pressure EFI systems
7. Continental ContiTech 23635: Specialty Pick
The Continental ContiTech 23635 is designed for quick assembly using push-on fittings, which can save time during an LS swap. Our research shows it is a solid choice for low to medium pressure applications. Owner feedback appreciates the ease of installation, especially in tight engine bays. The hose meets SAE J30R7 standards and offers good resistance to fuel.
However, push-on fittings have limitations. They are not recommended for high-pressure systems because they can blow off under extreme conditions. The hose also has a lower working pressure than braided alternatives. If your LS swap uses a high-pressure fuel pump, consider a hose with crimped or AN fittings. We recommend this for carbureted or low-pressure EFI builds where simplicity is key.
- Push-on fittings simplify installation
- Nitrile rubber tube resists fuel and oil
- Reinforced with two textile braids
Pros: Tool-free assembly with push-on fittings; Good flexibility for routing
Cons: Push-on fittings may not be as secure as crimp or AN
Frequently Asked Questions
What type of fuel line is best for an LS swap?
For most LS swaps, a nylon braided or PTFE lined hose with AN fittings is recommended due to high fuel pressure and ethanol compatibility. Rubber hoses work for low-pressure carbureted setups but are not safe for returnless EFI systems.
Can I use regular rubber fuel line for an LS swap?
Only if your LS swap uses a carburetor or low-pressure EFI (under 10 psi). For factory LS fuel injection (58 psi), you need a hose rated for high pressure, such as SAE 30R14 or better. Rubber hoses can swell and leak under high pressure.
What size fuel line do I need for an LS swap?
Most LS swaps use 3/8 inch (AN -6) fuel line for the feed and 5/16 inch (AN -4) for the return. For high horsepower builds, upgrade to AN -8. Always match the line size to your fuel pump and injector flow requirements.
Is PTFE fuel line worth the extra cost?
PTFE lined hoses offer superior chemical resistance and virtually zero fuel permeation, making them ideal for high-performance or race applications. For a daily driver on pump gas, nylon braided hose is often sufficient and more cost-effective.
How do I ensure my fuel line installation is safe?
Use hose rated for your system pressure and fuel type. Secure all connections with proper clamps or AN fittings. Avoid sharp bends and route the line away from heat sources. Regularly inspect for leaks or abrasion. Follow manufacturer guidelines and safety standards.
Our Verdict
After evaluating specs, standards, and owner feedback, the Russell Performance 640840 is our top pick for most LS swaps, offering a great balance of durability, performance, and value. For those needing extreme chemical resistance or building a high-horsepower track car, the Earl’s Performance 632106ERL is an excellent premium choice.
