If is a 911 Carrera 3.2 - its not an easy job - there's 4 in total pipes - 2 made from hard plastic and 2 running up along side the gearbox made from steel - both the supplies and returns join as they leave the tunnel just forward of the gearbox and usually you need to replace the entire pipes from the the tank to the fuel filter because they rust solid and are very difficult to split - also access due to the throttle, clutch and heater cables being in the same place. I've done it once with the engine/box in place and never again. The pipes enter the tunnel just above the steering rack. To get the pipes through the tunnel you need to remove the handbrake and gearstick and the rear transmission coupling cover - good luck and be prepared for skint knuckle's.