Essential for fuel delivery and fuel pressure maintenance, the electric fuel pump delivers fuel from the tank to the engine.
Symptoms of failure: hard starting, engine stalling, whining pump noise, poor acceleration

Responsible for filtering contaminants before they reach the injectors.
Replace every 30k–45k miles to prevent clogging, low fuel pressure, engine hesitation, and stalling

Maintains consistent fuel pressure across the fuel rail.
Fault symptoms: rough idle, engine misfire, hard starting, poor fuel economy, check engine light, black smoke, and fuel leaks

Atomize fuel for combustion in each cylinder.
Clogged injectors result in rough idle, engine hesitation, misfire—common in aging vehicles

Transport fuel under pressure from tank to engine.
Check for leaks, cracks, or kinks, which pose safety hazards and cause vapor lock or low fuel flow

The fuel tank stores gas; the EVAP canister and purge valve manage vapor emissions.
Faults here may trigger the Check Engine Light and compromise fuel economy

A faulty pressure sensor can trigger low-pressure codes (e.g., P0087), poor gas mileage, stalling, or hesitation

The fuel tank stores the vehicle's fuel. Modern tanks are designed to minimize evaporation and reduce emissions. A damaged or leaking tank can lead to fuel loss and environmental hazards.

Various sensors provide data to the ECU, including:

• Mass Air Flow (MAF) Sensor: Measures the amount of air entering the engine to calculate the correct fuel amount. 

• Manifold Absolute Pressure (MAP) Sensor: Monitors intake manifold pressure to assess engine load and adjust fuel delivery. 

• Crankshaft and Camshaft Position Sensors: Determine the position of the crankshaft and camshaft to synchronize fuel injection and ignition timing.

The throttle body controls the amount of air entering the engine, which in turn affects fuel delivery. A dirty or malfunctioning throttle body can cause rough idling and poor acceleration.