Function: Fuel pressure regulator filter used to create a returnless fuel supply for LS engine swaps and electronic fuel injection conversions. This bypass regulator passes excess fuel back into the tank so the pump can run freely. Feature: The fuel filter regulator with 6AN adpater fittings for LS Swap delivers 58 PSI (4 BAR) to your fuel rail and returns unused gas to the tank, and build-in a 10 micron fuel filter ensures clean fuel is delivered to your engine, thus to protect the normal operation of the engine, reduce wear, avoid blocking, improve the purpose of engine life. Compatible with: The fuel filter pressure regulator compatible with Chevrolet 1999-2014 V8 5.3L/325 Chevy small block Gen III/IV (LS-based engines), Chevrolet 1999-2014 V8 4.8L/294 Chevy small block Gen III/IV (LS-based engines), Chevrolet 1999-2014 V8 6.0L/364 Chevy small block Gen III/IV (LS-based engines). Please you check the part is your need before purchase. Installation: fuel filter regulator kit for LS Swap EFI Conversion can be installed anywhere between the tank and the engine, although it is usually installed in the engine compartment to make it easy to obtain even more uniform fuel pressure. Mounting bracket and rubber insulator are included to make installation a breeze.