System: fuel; fuel lines; metallic.vehicle description: light duty pickup trucks equipped with 7.4L engines.note: owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact chevrolet at 1-800-222-1020 or GMC at 1-800-462-8782. Also contact the national highway traffic safety administration's auto safety hotline at 1-800-424-9393.