The lifespan of a fuel pump can vary depending on several factors, including the type of vehicle, driving conditions, and fuel quality. In general, a fuel pump can last anywhere from 50,000 to 100,000 miles or more before it needs to be replaced.

1. Overheating: If the fuel pump is exposed to high temperatures, it can cause the fuel to boil and form vapor bubbles. This can cause the fuel pump to work harder and eventually fail.

2. Contaminants: Dirt, rust, and other contaminants in the fuel can cause the fuel pump to wear out more quickly. These contaminants can also clog the fuel filter, which can put additional strain on the fuel pump.

3. Electrical issues: A problem with the wiring or electrical components that control the fuel pump can cause it to fail or work intermittently.

4. Low fuel level: Running the fuel level too low can cause the fuel pump to overheat and eventually fail.

5. Age and wear: Over time, the components in the fuel pump can wear out, causing it to lose efficiency and eventually fail.

6. Improper installation: If the fuel pump is not installed correctly, it can cause damage to the pump or other components in the fuel system.

7. Corrosion: Corrosion can occur in the fuel tank or fuel lines, which can lead to the build-up of debris and clogs. This can cause the fuel pump to work harder and eventually fail.

1. Engine sputters or stalls: If your engine sputters or stalls while driving, it could be a sign that your fuel pump is failing. This is caused by a lack of fuel getting to the engine.

2. Loss of power: If your vehicle is losing power while accelerating or driving up a hill, it could be a sign that the fuel pump is not providing enough fuel to the engine.

3. Difficulty starting: If your vehicle is having trouble starting or is taking longer than usual to start, it could be a sign that the fuel pump is not functioning properly.

4. Whining noise: A whining noise coming from the fuel tank or engine compartment could indicate that the fuel pump is failing. This noise is caused by a worn or damaged fuel pump.

5. Engine warning light: If the "Check Engine" or "Service Engine Soon" warning light is illuminated on the dashboard, it could be a sign of a failing fuel pump.

6. Decreased fuel efficiency: A failing fuel pump can cause your vehicle to have decreased fuel efficiency. This is because the engine is not receiving the optimal amount of fuel.

7. Overheating: A failing fuel pump can cause the engine to overheat. This is because the fuel pump is not providing enough fuel to cool the engine.

You can follow steps of How to Replace on the page of Description. However, it is recommended to have the fuel pump replaced by a qualified mechanic if you are not comfortable with the process or do not have the necessary experience and tools.

There are four ways to test a fuel pump to determine if it is functioning properly:

1. Fuel pressure test: A fuel pressure test involves connecting a fuel pressure gauge to the fuel rail or fuel line and checking the pressure of the fuel system. If the pressure is below the specified range, it may indicate a problem with the fuel pump.

2. Voltage test: A voltage test involves using a multimeter to test the voltage at the fuel pump connector. The voltage should be consistent with the manufacturer's specifications. If there is no voltage or the voltage is below the specified range, it may indicate a problem with the fuel pump or the electrical system.

3. Fuel pump sound test: A fuel pump sound test involves turning the key to the "on" position without starting the engine and listening for the sound of the fuel pump. You should hear a buzzing sound indicating that the fuel pump is working. If you do not hear the sound, it may indicate a problem with the fuel pump or the electrical system.

4. Fuel pump current draw test: A fuel pump current draw test involves using an amp meter to test the electrical current draw of the fuel pump. The current draw should be consistent with the manufacturer's specifications. If the current draw is too high or too low, it may indicate a problem with the fuel pump or the electrical system.