Audi R8 RS4 Fuel Pressure Relief Regulating Valve Regulator – 079130757 GENUINE OEM. Product Details: Audi R8 RS4 Fuel Pressure Relief Regulating Valve Regulator 079130757 GENUINE OEM. Valve located on the underside of each fuel rail. Original Audi Part Number. Audi RS4 Cabriolet qu. Please check if this part number fits your vechicle!!! If you are unsure that this part will fit your vehicle please contact me with your model and VIN (chassis) number. Return items must be unused with all original paperwork, accessories and container. Feedback : – We guarantee to leave all customers positive feedbacks after feedback is received.