What are the reasons for a car fuel pump not supplying oil and failing to start?

[DelVivienne]

Detailed explanations and solutions for the reasons why a car fuel pump does not supply oil and fails to start are as follows: 1. Crankshaft position sensor failure: The function of the crankshaft position sensor is to monitor the position of the crankshaft and allow the engine computer to sense the speed signal. If the crankshaft position sensor fails, the computer cannot detect the speed signal, thus preventing the engine from starting. Solution: Replace the crankshaft position sensor. 2. Dead battery: A car battery can lose power due to prolonged parking, generator damage, insufficient or leaking electrolyte, blown fuses, corrosion of the car battery terminals, or excessive battery usage. Solution: Charge the battery or replace it. 3. Wear between the plunger and plunger sleeve: During use, mechanical impurities in the fuel enter the fuel pump chamber, causing abrasive wear. Combined with the corrosive effect of the fuel, the gap between the plunger and sleeve increases, leading to fuel leakage during the oil pressure stroke, resulting in insufficient or no fuel supply. Solution: Replace the damaged parts.