Fuel Injection Pressure Regulator. Pressure Reg FITMENT NOTES: Engine: 3.8L V6. Compatible Years: 1988 1989 1990 Item Specifics Adjustable: No Gauge Port: No Inlet Port Diameter: 0.51 IN Inlet Port Diameter: 13.0 MM Inlet Quantity: 1 Inlet Type: Push In Material: Metal Material: Metal Mounting Type: Bolt Outlet Port Diameter: 13.0 MM Outlet Port Diameter: 0.51 IN Outlet Quantity: 1 Outlet Type: Push In System Pressure: 51. Confirm Your Vehicle Compatibility. Engine: 3.8L V6. Also review the notes section in the compatibility chart for additional specifications about this part.