What Causes Intermittent Fuel Supply in Cars?
2 Answers
Reasons for intermittent fuel supply in cars: 1. Slight blockage in the fuel line; 2. Insufficient fuel supply due to errors in the computer board's program; 3. Electrical issues, such as insufficient high-voltage energy from the ignition coil, leakage in high-voltage wires or spark plugs; 4. Fuel pump failure to draw fuel, a common issue where sudden inability to draw fuel causes power interruption, possibly due to severe clogging of the fuel filter or fuel pump malfunction; 5. Poor fuel quality, a significant factor in weak car acceleration and a common problem among many car owners. Poor fuel quality can affect the gasoline filter and fuel line, potentially leading to poor fuel supply and weak acceleration. It also impacts the lifespan of the exhaust system's three-way catalytic converter. If the catalytic converter is clogged, it directly affects the vehicle's acceleration performance, increases fuel consumption, and results in weak acceleration.
Recently encountered several such issues while working in the garage. Sudden fuel cutoff during acceleration usually has several common causes. The fuel pump is the most frequent failure point – when pressing the accelerator demands higher fuel pressure, an aged or worn pump can't keep up, causing engine sputtering or even stalling. Clogged fuel filters are another major culprit; excessively dirty filter screens obstruct fuel flow, particularly during hard acceleration. Air leaks in fuel lines shouldn't be overlooked either – loose fuel line connections or deteriorated seals can introduce air into the system, disrupting proper fuel delivery. When throttle position sensors or mass airflow sensors malfunction, the ECU miscalculates air intake and incorrectly adjusts fuel supply. Ignition system problems like severely carbon-fouled spark plugs or unstable coil voltage can also cause fuel-spark mismatch. Don't force drive under such conditions as it may cause greater damage or hazardous roadside breakdowns. Professional diagnostic testing at a repair shop is recommended. Regular filter replacements and fuel pump pressure checks effectively prevent these issues.
