Fuel Line and Regulator Kit for LS and LT Engine Swaps
When fitting a 400 LPH pump in an LS or LT engine conversion, maintaining stable fuel pressure under boost becomes critical and this fuel line and regulator kit is built to manage that demand. Equipped with PTFE braided lines that resist ethanol blends and abrasion under the hood, the assembly uses a returnless layout to cut heat soak in short feed paths. Direct match fittings mate to late model rails without adapters, while the adjustable regulator holds a 58 psi reference through intake vacuum and boost shifts for consistent injector spray across engine speed. Precision tolerances deliver rapid pressure response at sudden throttle openings and reduce the risk of lean spikes in both naturally aspirated and forced induction LS and LT setups.
Dynamic Pressure Regulation for Consistent Fuel Delivery
The adjustable regulator monitors intake vacuum and boost to maintain a stable 58 psi reference over the entire operating range of the 400 LPH pump. By sensing both positive and negative pressure shifts, the unit prevents lean conditions during rapid throttle changes or boost events. Precision machining ensures the internal valving responds in milliseconds to pressure spikes, which improves throttle response and reduces detonation risk. The regulator housing is manufactured in the USA from corrosion resistant alloys to withstand harsh fuel acids and environmental exposure. Its compact footprint fits neatly in engine bays of late model GM swap vehicles. Fine tuning is possible without adapters for both naturally aspirated and boosted LS and LT engine setups.
PTFE Braided Lines with Stainless Steel Sheathing
Each fuel line features a pure PTFE inner tube with a protective stainless steel braid and heat resistant jacket. The PTFE core offers negligible permeability to ethanol blends while the braid prevents expansion under high pressure. The cover material guards against chafe and shields paint and wiring in tight engine bays. Leakproof fittings secure the lines to late model rails without adapters and prevent seepage at high psi levels. This combination of materials delivers consistent flow characteristics over extended service intervals while resisting wear from vibration and heat cycling. Technicians will note ease of routing in confined compartments due to the flexible yet robust construction.
Returnless Layout Simplifies Fuel Delivery Path
The returnless configuration delivers fuel directly from the pump to the regulator without a return loop back to the tank. Eliminating extra hoses shortens the feed path, which lowers thermal gain in the fuel and preserves density under load. Fewer connections reduce potential leak points and simplify the plumbing for a clean installation. This layout conforms to original equipment styling and allows the engine bay to retain a factory appearance. Installers appreciate the screw together fittings and line clamps that mate to LS and LT rails for quick assembly and neat routing.
Comprehensive Kit Components for Hassle Free Assembly
This kit includes an adjustable fuel pressure regulator with vacuum and boost reference port, stainless steel braided PTFE lines with protective covering, and a high volume fuel filter. Two piece fittings match LS and LT rails without machining, and assorted connectors cover tank to rail plumbing needs. Line clamps and mounting hardware are supplied to secure the assembly under the hood. Every part is made in the USA from corrosion resistant materials for proven durability in street or track applications. Builders gain confidence knowing that each piece aligns perfectly for a shop ready result without custom fabrication. The comprehensive nature of the kit reduces the need to source additional parts and cuts overall project time.
Trust this kit to maintain consistent fuel pressure under boost. To access the Same Kit but at a smaller capacity of 255 LPH see our Fuel Line and Regulator Kit - 255 LPH.