Function: Located inside the fuel tank, the fuel pump delivers fuel from the tank to the fuel injectors or carburetor while the sender monitors fuel levels and transmits the information to the fuel gauge.
Signs of Wear: Difficult engine starting, slow acceleration qualities, intermittent power loss, inaccurate fuel gauge reading (Sender).
Most gasoline powered vehicles use an electric fuel pump located in the fuel tank to force fuel into the engine. The pump is submerged in fuel, which helps to keep the electric motor from overheating. Fuel is pumped at high pressures through a fuel filter to the fuel injectors. Electric fuel pumps can fail suddenly without warning signs, or may fail partially - with a drop in the amount of fuel the pump is able to deliver. This will result in a loss of power under extreme load conditions, such as when driving up a steep hill, or under heavy acceleration
Function: Traps fuel contaminants before they enter the engine's fuel delivery system.
Signs of Wear: Rough-running engine, poor acceleration, decreased fuel economy, decreased power at high road speeds.
The fuel filter screens out dirt and other harmful objects from the fuel system. These objects, if not filtered out, can cause the fuel system to malfunction. If unfiltered fuel reaches the fuel injectors, they may become clogged and cause an engine misfire. Where fitted, fuel filters should be replaced regularly to keep the fuel system flowing freely. Clogged filters can put a heavy strain on the fuel pump, and can result in a loss of power when driving.
It must be changed at recommended manufacture service intervals to ensure proper fuel system operation.
Function: Measures the amount of air entering the engine to determine the most efficient air/fuel mixture for achieving clean burns.
Signs of Wear: Engine hesitation, stalling, decline in engine performance, "Service Engine Soon" light illuminates.
When a mass air flow sensor becomes defective, it is unable to accurately measure the amount of air entering the engine. As a result, the engine will run poorly and even in some cases, will not run at all. Defective mass air flow sensors usually illuminate the check engine light for air flow problems or misfire problems.
Function: Electronically informs the Powertrain Control Module (PCM) of the throttle's angle. The PCM uses this input to regulate the fuel and ignition system.
Signs of Wear: "Service Engine Soon" illuminates, poor engine performance.
Function: Controls the fuel pressure going to the fuel injectors.
Signs of Wear: Engine knock, lack of power, engine smoke, increased exhaust emissions, poor fuel economy.
Function: Controls the amount of air that bypasses the throttle plate in order to regulate idle engine speed.
Signs of Wear: Irregular idle, stalling.
Function: Sprays fuel into the engine's intake manifold or cylinders.
Signs of Wear: Sluggish engine performance, poor acceleration, emission noncompliance.
Function: Monitors fuel levels and transmits the information to the fuel gauge.
Signs of Wear: Inaccurate fuel gauge reading
Many times now included with fuel pump assembly.
Check out the fuel system in action! Posted with the permission of Virtual Vehicle MD.
Together, these unnecessary fuel costs can total hundreds of dollars a year. Clearly, a little preventive maintenance not only saves you money in the long run, but also helps extend vehicle life and increase vehicle safety.
Professional Auto Care is the premier auto repair and car maintenance facility in Southwest Houston just outside Missouri City and Sugar Land. We pride ourselves in having a thorough process of not only identifying the source of a problem, but providing our clients with hard evidence of any repair recommendations with photographs and proof with clear descriptions of necessary action. Our main goal is educate our clients on how to care for their fuel system to help prevent fuel system related repairs in the future.