About this item
Building an LS swap fuel system from separate hose, fittings, filters and regulators can create pressure-matching problems, missing adapters and unnecessary plumbing connections. The EVIL ENERGY LS swap fuel line kit combines a fixed 58 PSI filter regulator, a built-in 10-micron filter, 25 feet of 6AN PTFE hose and the fittings needed to fabricate compatible supply and return lines. It provides a coordinated solution for custom EFI conversions using supported Chevrolet 4.8L, 5.3L and 6.0L LS-based engines.
LS Swap Fuel Line Kit Fitment and System Requirements
This is a universal fabrication kit built around a fixed 58 PSI fuel filter regulator. It is documented for 1999–2014 Chevrolet V8 4.8L, 5.3L and 6.0L LS-based engine applications, but it is not a vehicle-specific, preassembled fuel line kit. Confirm the engine's required fuel pressure, fuel-rail connection, pump capacity and chassis routing before installation.
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Engine compatibility: Intended for supported LS-based Chevrolet 4.8L, 5.3L and 6.0L EFI applications requiring approximately 58 PSI.
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Pressure requirement: The regulator is fixed at 58 PSI and cannot be adjusted for engines or injectors requiring a different base pressure.
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Fuel-flow layout: Connect the pump feed to the 3/8-inch inlet, the 3/8-inch regulated outlet to the engine and the 5/16-inch return port to the tank.
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Universal installation: Hose cutting, PTFE fitting assembly, component mounting and custom routing are required.
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Fuel compatibility: The supplied PTFE hose is listed for E85, gasoline, diesel and biodiesel. Confirm that the pump, tank seals, injectors and remaining system components are compatible with the selected fuel.
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Pump requirement: Select a fuel pump capable of supplying the required flow above the regulator's 58 PSI setting. A fuel pump is not included.
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Filtration requirement: The integrated 10-micron filter is a fine EFI filter and does not replace a compatible tank pickup strainer or pre-pump filter when one is required by the pump manufacturer.
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Pressure-rating notice: The 1,500 PSI specification applies to the PTFE hose, not the complete fuel system. Overall system pressure is limited by the lowest-rated component.
Key Features of the 58 PSI LS Swap Fuel Line Kit
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58 PSI Filter and Regulator in One: Combines pressure control and 10-micron filtration in a compact assembly, reducing the number of separate components and connections.
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25FT E85-Compatible PTFE Hose: Provides enough continuous 6AN hose for custom pump-to-regulator, regulator-to-engine and return-line routing in many swap projects.
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Supply and Return Port Identification: Clearly defined 3/8-inch inlet, 3/8-inch engine outlet and 5/16-inch return connections help prevent incorrect plumbing.
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Multiple 6AN Connection Options: Straight and 45-degree hose ends, NPT adapters and EFI quick-disconnect fittings support different pump, tank and fuel-rail layouts.
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Designed for Modern Fuels: The PTFE inner core offers better resistance to ethanol fuel permeation and material swelling than conventional rubber-based hose.
Fixed 58 PSI Fuel Pressure with Built-In 10-Micron Filtration
The combined unit regulates outlet pressure to approximately 58 PSI (4 BAR) while filtering fuel through an integrated 10-micron element. This configuration helps maintain the pressure expected by compatible LS EFI systems and intercepts fine contamination before fuel reaches the injectors.
Because the filter and bypass regulator share one housing, the system requires fewer separate components than a layout using an individual inline filter and external regulator. Fewer connections can also simplify mounting and reduce potential leak points when the system is assembled correctly.
3/8-Inch Inlet, 5/16-Inch Return and 3/8-Inch Engine Outlet
The regulator uses a 3/8-inch inlet from the fuel pump, a 5/16-inch return port to the tank and a 3/8-inch regulated outlet to the engine. This bypass arrangement returns excess fuel before it reaches the fuel rail, allowing one regulated supply line to continue forward to the engine.
Follow the IN, OUT and RT markings on the regulator body. Reversing the inlet, outlet or return connection can prevent correct pressure regulation. Keep the return line unrestricted and mount the assembly securely away from exhaust heat, moving components and direct road impact.
25FT Three-Layer 6AN PTFE Fuel Hose
The included 6AN hose uses a chemical-resistant PTFE inner core, stainless steel braided reinforcement and a black nylon braided outer cover. This structure provides resistance to fuel permeation, pressure-related expansion and exterior abrasion during chassis and engine-bay routing.
The hose measures approximately 0.31 inch ID and 0.46 inch OD, with a 1,500 PSI maximum working pressure, 4,500 PSI burst pressure and -76°F to 446°F temperature range. Maintain at least the specified 3.5-inch bend radius; PTFE hose is stiffer than CPE or conventional rubber hose and should not be folded or forced around sharp corners.
Why Use PTFE Fuel Hose for E85 and LS Swap Systems?
PTFE provides a wider operating-temperature range and greater resistance to ethanol-based fuels than typical NBR or CPE rubber hose. It helps limit fuel-vapor permeation and avoids the swelling or gradual material degradation that may occur when an incompatible rubber hose is exposed to E85.
The hose is listed for E85, gasoline, diesel and biodiesel applications. Compatibility applies to the supplied PTFE hose and documented kit components; every other part of the fuel system must also be verified for the intended fuel.
6AN Hose Ends, NPT Adapters and EFI Quick Disconnects
Six straight and two 45-degree reusable swivel hose ends provide eight termination points for the supplied PTFE hose. Straight fittings suit direct chassis runs, while the 45-degree fittings help reduce routing stress near the pump, regulator, tank and fuel rail.
The kit also includes 6AN-to-1/4-inch NPT adapters and multiple 3/8-inch and 5/16-inch EFI quick-disconnect fittings. Verify the tube outside diameter, retention bead and connector style before use; two connections described as “3/8 inch” may still use different male or female locking profiles.
AN fittings seal at the 37-degree flare and do not require pipe-thread sealant on the flare surface. Use fuel-compatible thread sealant only on applicable NPT threads and keep sealant out of the internal fuel passage.
PTFE Fuel Hose Cutting and Fitting Assembly
Plan the complete supply and return layout before cutting the 25FT hose. Maintain clearance from exhaust components, driveshafts, suspension travel, sharp sheet-metal edges, and other sources of heat or abrasion. Support long runs with suitable clamps without crushing the hose.
Wrap the cutting point, make a square cut, and use the supplied reaming tool to restore the PTFE liner opening without damaging it. Fully seat the liner and olive or ferrule according to the fitting design, inspect the flare surfaces, flush the completed lines, and pressure-test every connection before starting the engine.
What Is Included with the LS Swap Fuel Line Kit?
- 58 PSI fuel filter regulator with built-in 10-micron filter and mounting bracket × 1
- 25FT 6AN nylon-braided PTFE fuel hose × 1
- 6AN straight reusable swivel PTFE hose end × 6
- 6AN 45-degree reusable swivel PTFE hose end × 2
- 6AN male to 1/4-inch NPT male adapter × 2
- 6AN to 3/8-inch EFI female quick-disconnect fitting × 2
- 6AN to 5/16-inch EFI female quick-disconnect fitting × 1
- 6AN to 3/8-inch EFI male quick-disconnect fitting × 1
- Two-way PTFE hose reaming and assembly tool × 1
Not included: Fuel tank, fuel pump, pump wiring, fuel rail, injectors, tank pickup strainer, pre-pump filter, hose clamps and vehicle-specific mounting fasteners are not shown as part of this kit.
Why Choose the EVIL ENERGY 58 PSI LS Swap Fuel Line Kit?
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LS-focused pressure control: The fixed 58 PSI output is matched to supported LS-based EFI applications without requiring external pressure adjustment.
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Combined filtration and regulation: A built-in 10-micron filter reduces component count and simplifies the regulated fuel-line layout.
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Long custom-routing capacity: The 25FT hose provides material for multiple supply and return sections in many engine-swap chassis.
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PTFE fuel compatibility: The inner liner supports E85 and other listed fuels while handling higher temperatures than common rubber-based hose.
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Multiple connection styles: Straight and angled hose ends, NPT adapters and EFI quick connects accommodate different component orientations.
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Clear system selection: Defined pressure, port sizes, hose dimensions and package contents help builders verify compatibility before cutting or installing the line.
