To repair a fuel line on an automobile, place catch containers under the fuel line connection points, disconnect the fittings, release all retaining clamps and remove and replace the old line. Depending on the make, model and year of the vehicle, the fuel line may be constructed of rubber, plastic or metal. Select the correct replacement fuel line for your specific vehicle.
Park the car on a flat surface and engage the parking brake. Depending on the height of the vehicle, it may be necessary to jack it up and place it on jack stands to access the fuel line. Locate the connection point to the fuel tank, disconnect the line and drain any remaining fuel from the line into the container below it. Follow the line to the front of the vehicle and disconnect and drain it the same way.
Use a screwdriver to loosen the retaining clamps holding the fuel line to the undercarriage and remove the old line. Install new ferals on each end of the new fuel line and leave about 1/16 of an inch of fuel line protruding through to ensure a good seal. Insert the new line into the retaining clamps and tighten the clamps using a screwdriver. Fasten the fittings at both ends, taking care not to screw them too tightly and degrade the seal.