Vacuum Hose Fuel Pressure Regulator To Inlet Manifold fits HSV Commodore VN 3.8 Litre LG2 (L27) V6 12 Valve OHV MPFI 3791cc. Introducing the Mackay Vacuum Hose Fuel Pressure Regulator To Inlet Manifold, designed specifically to fit the 3.8 Litre LG2 (L27) V6 12 Valve OHV MPFI 3791cc engine.