LS and LT Engine Fuel Line and Regulator Kit
When your LS or LT swap calls for a 400 LPH pump, the Fuel Line and Regulator Kit - 400 LPH steps in to deliver the precise pressure control needed to keep the engine running smoothly. Featuring an adjustable regulator that draws on intake vacuum and manifold boost signals, it holds a consistent 58 psi reference under varying loads. Plumbing stays clean thanks to a returnless layout while PTFE braided lines in a protective cover and leakproof fittings resist heat, abrasion and ethanol blends for dependable operation.
Adaptive Pressure Control for LS and LT Applications
The adjustable regulator uses both intake vacuum and manifold boost signals to maintain precise fuel pressure, matching cylinder demands across the rpm range. By holding a consistent 58 psi reference under load shifts, it prevents lean spikes during hard acceleration or boosted operation. Builders can fine tune the valve for naturally aspirated LS and LT powerplants as well as turbo or supercharged setups, ensuring stable spray patterns and combustion. Its design aligns with late-model OE rails, delivering a direct fit and reliable performance without custom fabrication.
PTFE Braided Fuel Line Resisting Heat and Ethanol
Each line features a core of PTFE encapsulated in a stainless steel braid and covered with a durable outer sleeve to shield against abrasion and high under-hood temperatures. The low-permeability tubing also reduces vapor loss, which is crucial when running ethanol blends. Leakproof fittings at every junction guarantee secure connections, while the protective wrap prevents chafing against wiring and painted surfaces. This combination of materials ensures long-term integrity even in track or street environments.
Simplified Returnless Fuel Delivery System
The returnless layout eliminates the need for a separate return line, cutting installation time and reducing potential leak points. Fuel flows directly from the pump into the regulator, keeping inlet pressure steady regardless of engine speed or load. This scheme minimizes heat soak in the lines, preserving fuel density for repeatable performance on both street and strip. Included two piece screw together fittings and clamps streamline plumbing, allowing a clean engine bay without extensive rerouting.
Engineered Corrosion Resistance and Precision Fit
All components are manufactured in the USA from corrosion-resistant materials to withstand modern pump gases and environmental factors. Stainless steel fittings resist rust and chemical attack, while the regulator housing is machined to tight tolerances for leak-free operation. This meticulous build quality provides consistent performance and service life, reducing the need for routine maintenance. The result is a fuel system assembly that installs with confidence and endures under demanding conditions.
This kit delivers precise fuel pressure control and reliable operation on LS and LT builds. For the Same Kit but at a smaller capacity of 255 LPH, see our Fuel Line and Regulator Kit - 255 LPH.