What Happens When a Car Runs Out of Fuel?

[LeJosie]

When a car completely runs out of fuel, two phenomena may occur: the loss of power steering and brake assist, ultimately leading to the vehicle shutting down. Here are additional details about these two phenomena: 1. Loss of Power Steering: Vehicles commonly use mechanical or electro-hydraulic power steering. When the engine suddenly shuts off, the power steering pump stops working, making the steering wheel heavy and difficult to turn. For electric power steering, assistance is provided by an electric motor. Running out of fuel and engine shutdown does not mean the entire vehicle loses power; the electric motor in the steering system can still function without issue. 2. Loss of Brake Assist: The car's braking system relies on vacuum assist, which is generated by the engine. After the engine shuts off, the vacuum booster still retains some vacuum, ensuring the first few brake applications remain assisted. However, once the vacuum is depleted, the brake pedal becomes hard, making braking more difficult.