CJM S1 VQ35DE Fuel Return System with Pressure GaugeThe S1 VQ35DE fuel system builds on the S0 system by introducing our billet aluminum fuel rails and an engine bay plumbing upgrade. Starting with a 6AN QD adapter for the fuel feed pipe, a 6AN hose feeds fuel into the rear of the RH fuel rail. The rails are joined in the front with a short 6AN crossover hose and fuel leaves the rear of the LH rail leading to the adjustable regulator. From this point back, it matches the S0 system with a 6AN return