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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