Given the following context:  On March 21, 2023, the media credits the annual Purge, a 12-hour period wherein all crimes are legal without authorities intervening, as an economic success. Everywhere, people prepare to either barricade themselves indoors or commit acts of violence. The nation's impoverished population is no longer seen as people, but as living garbage, whom the wealthy denounce as only living to serve their needs. However, before the sixth annual purge begins, a successful anti-purge resistance group led by Carmelo Johns and his partner, the Stranger from the first film hijack government feeds to denounce the New Founding Fathers and their actions. In Los Angeles, working-class waitress Eva Sanchez returns home to her 17-year-old daughter Cali and terminally ill father Rico, who also despises the New Founding Fathers. As Eva and Cali prepare to barricade themselves into their apartment, Rico retires to his room to be alone as the Purge starts. As the Purge alarm sounds, Rico slips out to a waiting limousine, leaving a note for his family revealing that he has sold himself as a Purge offering in exchange for $100,000 to be paid to Eva and Cali after the Purge. Eva and Cali are distraught by this situation.  Married couple Shane and Liz visit a grocery store, only to be ambushed by a masked gang of bikers. As they drive away to avoid them, their car breaks down, as the biker gang had cut their fuel line. Meanwhile, an off-duty Los Angeles Police Department sergeant, Leo Barnes, plots to kill Warren Grass, a man who had inadvertently run down and killed his son while driving drunk, and was acquitted on legal technicalities. Barnes drives out into the streets with an armored car and several weapons, posing as a vigilante.  answer the following question:  Whose fuel line was cut?
Answer:
Shane and Liz