Why does the car fail to start when the fuel pump is not supplying oil?
2 Answers
There are several reasons why a car fails to start when the fuel pump is not supplying oil: Low fuel level: If the car has very little fuel or the fuel gauge shows it is below the red line, it naturally won't start. When you find that the car won't start, the first thing you should do is check the fuel gauge to see if there is any fuel left. Additionally, never wait until the fuel tank is empty before refueling. This not only affects the lifespan of the engine but also the fuel pump. Operating the fuel pump without fuel can even be dangerous. Crankshaft position sensor failure: The crankshaft position sensor is one of the most important sensors in an electronically controlled fuel injection engine, especially in centralized control systems. It is also a shared sensor for both the ignition system and the fuel injection system. The function of the crankshaft position sensor is to monitor the position of the crankshaft, allowing the engine's computer to detect the speed signal. If the crankshaft position sensor fails, the computer cannot detect the speed signal and thus cannot determine whether to ignite, resulting in the car failing to start.
The car won't start, and the fuel pump isn't delivering fuel. I've encountered this issue several times while repairing my own car. The most common cause is a faulty fuel pump motor, which could be due to aging, wear, or power supply issues. First, check the fuse—look for the "fuel pump" label in the fuse box to see if it's blown. If replacing it doesn’t work, inspect the relay, which controls the current flow; if it’s faulty, it won’t supply fuel. Poor electrical connections are also common, such as loose or corroded wiring, leading to unstable voltage. Additionally, a clogged fuel filter can obstruct fuel flow, causing insufficient pressure, so try replacing the filter regularly. Maintaining the fuel system is crucial—neglecting it can lead to breakdowns at critical moments, like during long drives. Pay attention to the fuel pump's sound when starting the car; if there’s no humming noise, it’s likely malfunctioning. Get it checked at a professional shop promptly to avoid further issues.