EFI Fuel Line Routing Using Corvette LS9904 Filter / Regulator

This Diagram illustrates how to route fuel lines using the Corvette-style LS9904 filter/regulator, which combines fuel filtration and pressure regulation into a single return-style unit. Commonly used in LS swaps, this setup simplifies plumbing by allowing a single feed line to the engine while managing return flow at the filter. Ideal for budget-friendly or OEM-style builds

Typically used with factory rails but can use billet rails.

Source: Tanks Inc.