What are the reasons why a Nissan won't start?

[Gideon]

The reasons why a Nissan won't start include low fuel in the tank, low battery charge, abnormal fuel pump, or a clogged exhaust pipe. First, check if there is fuel in the tank. A vehicle lacking fuel naturally won't start. If the fuel level is very low, check if the car is parked on a slope. When the ground has a significant incline, the fuel in the tank may gather on one side, potentially preventing the fuel pump from supplying fuel properly, leading to the vehicle's inability to start. Check if the vehicle's battery has sufficient charge. If, when starting the engine, you only hear a weak sound from the starter, it's likely due to a depleted battery causing the startup failure. In such cases, the issue can only be resolved by jump-starting or replacing the battery. Method to check if the fuel pump is functioning normally: Generally, when the vehicle is powered on, you can hear a slight sound from the fuel pump turning, which automatically stops after three to five seconds. If you don't hear this sound, the fuel pump may not be working correctly. Such faults usually occur in older vehicles. Most vehicles currently require pressing the clutch pedal (or brake pedal for automatic transmission models) to start normally. However, sometimes, after prolonged parking, the brake pedal may become stiff and hard to press. In this case, the driver needs to press the pedal firmly until the brake light switch is triggered before starting the vehicle. For automatic transmission models, also check if the gear is in P (Park) or N (Neutral) when starting; otherwise, the vehicle won't start. Automatic transmission vehicles cannot start if the gear is in D (Drive) or R (Reverse).