Replacing Fuel Pump In 2009 Chevy Cobalt: Step-By-Step Guide

If you're experiencing issues with your 2009 Chevy Cobalt, you may need to replace the fuel pump. The fuel pump is responsible for delivering fuel from the tank to the engine, and problems with it can cause the engine to lose power or the car to stall unexpectedly. Before attempting to replace the fuel pump, it's important to diagnose the issue and ensure that the problem is not caused by a bad relay, fuse, or circuit. Replacing the fuel pump can be dangerous due to the risk of fire, so unless you are very experienced in auto repair, it's recommended to let a professional handle this job. The cost of replacing the fuel pump can vary depending on the part grade, warranty coverage, and included components, but it typically ranges from $260 to $380 for the parts and $185 to $233 for labor.

Signs of a failing fuel pump

The fuel pump is a critical component of your 2009 Chevrolet Cobalt's fuel delivery system, transferring gasoline from the fuel tank to the engine. While fuel pumps are designed to be long-lasting, they can occasionally fail and need to be replaced. Here are some signs that your fuel pump may be failing:

• Engine sputtering or stalling: If your engine sputters during normal driving or experiences unexpected stalling, it could indicate a problem with the fuel pump's ability to deliver a consistent flow of fuel to the engine.
• Whining noise from the fuel tank: Fuel pumps are typically quiet, so if you hear a loud whining or whirring noise coming from the fuel tank area, it could be a sign that the fuel pump is failing.
• "Check Engine" light: If the fuel flow becomes restricted, it can trigger the "Check Engine" light. This could be due to a failing fuel pump or a clogged fuel filter.
• Engine struggles to maintain speed: A failing fuel pump may not be able to deliver enough fuel to the engine, causing it to choke or struggle to maintain speed.
• Noises, backfires, and a sputtering engine: In addition to engine sputtering, you may also notice unusual noises and backfires.
• Hesitation at start or take-off: If the fuel pump is weak or failing, you may experience hesitation or delay when starting the vehicle or accelerating from a stop.
• Overheating: A failing fuel pump can cause the engine to overheat due to insufficient fuel delivery.

If you notice any of these symptoms, it's important to have your vehicle checked by a qualified mechanic as soon as possible. Ignoring these warning signs can lead to further complications, including complete engine failure.

How does the fuel pump work?

The fuel pump is the core of the 2009 Chevrolet Cobalt fuel delivery system. It is a compact 12-volt electric pump submerged in fuel inside the fuel tank. The pump transfers fuel from the fuel tank at the back of the car to the engine at the front.

Fuel pumps on most cars and trucks use an electric motor to drive a fluid pump. The pump can be either inside or outside the fuel tank. Either way, the fuel is sucked out of the fuel tank and pushed through a line to a filter, and then to the fuel injectors. The pump must deliver the right amount of fuel and at a high enough pressure to keep the engine running smoothly in all conditions.

Along the way, the fuel passes through a filter, either inside the fuel tank or externally in the fuel flow line. Most fuel pumps will last for the life of the vehicle, but occasionally they can fail. Signs of such failure include a car that won't start or stalls once it has started. Other times, the fuel flow can slowly become starved, causing the check engine light to come on.

Symptoms of a bad fuel pump

The fuel pump in a 2009 Chevy Cobalt is located inside the fuel tank and is designed to last for the life of the vehicle. However, there are several symptoms that indicate a bad fuel pump.

Firstly, a failing fuel pump may cause the engine to "choke" or struggle to maintain speed, resulting in noises, backfires, and a sputtering engine. There may also be hesitation at start-up or take-off. Additionally, a bad fuel pump can overheat, causing the engine to overheat as well. These issues may be accompanied by the illumination of the "Check Engine" light. If left unaddressed, the engine may eventually fail to start.

Other signs of a failing fuel pump include unexpected stalling, a loud whining noise coming from the fuel tank, or a drop in performance and an increase in fuel consumption. In some cases, you may notice jolting when accelerating, or the car may not start at all.

How often do fuel pumps need to be replaced?

The fuel pump is a crucial component of a car's fuel delivery system, transferring fuel from the tank to the engine. While some fuel pumps can last the lifetime of the vehicle, others will need to be replaced if they fail or wear out. Fuel pumps are built to be durable and long-lasting, with a lifespan of well over 200,000 km of driving. However, mechanics generally recommend replacing the fuel pump only when it breaks down.

After 150,000 km, the likelihood of failure increases, and mechanics may suggest replacing the fuel pump if another major part of the fuel system is being replaced simultaneously to cut down on labour costs. It's important to note that fuel pump failure can be challenging to diagnose, as the symptoms may be indicative of issues with other systems.

Signs of a Failing Fuel Pump:

• Whining or loud whirring noises coming from the fuel tank area.
• Sudden losses of engine power, especially at high speeds, due to inconsistent fuel flow.
• Sudden surges in engine power.
• The "Check Engine" light turns on due to an incorrect air/fuel ratio.
• The car struggles to start or stalls shortly after starting.
• Engine "chokes" or struggles to maintain speed.
• Backfires and a sputtering engine.
• Engine overheating.

If you suspect a faulty fuel pump, it is best to consult a mechanic as soon as possible to avoid potential engine failure. The replacement process involves dropping the fuel tank and can be moderately complicated, so it is often performed at a dealership's service department or by experienced mechanics.

How to replace the fuel pump

Step 1: Diagnose the Fuel Pump

Before removing the fuel tank, it is important to diagnose whether the fuel pump is faulty. Check that power is getting to the pump and, if possible, power it externally to ensure that it has failed. Other potential issues could be a bad relay, bad fuse, or bad circuit.

Step 2: Disconnect the Battery

Disconnecting the battery reduces the chance of a fire.

Step 3: Remove the Fuel Tank

In order to access the fuel pump, you will need to remove the fuel tank.

Step 4: Access the Fuel Pump

For pumps inside the fuel tank, there will usually be an access cover that needs to be removed. In some cases, fuel will need to be drained before removing the access panel.

Step 5: Replace the Fuel Pump

With the cover off, replace the pump and pre-pump filter screen.

Step 6: Reattach the Access Cover and Fuel Tank

Once the pump is replaced, check for fuel leaks and ensure that there are no fuel leaks or odors.

Step 7: Test the Car

Try starting the car to see if the fuel pump replacement has solved the problem.

Important Safety Information

Working with the fuel system is dangerous and precautions must be taken to avoid starting a fire. If you see or smell gasoline, do not start or drive the car, and do not park inside your house or under a covered structure. Have the car towed to a shop for inspection and repair.

Additional Information

The fuel pump is part of the system that brings fuel to the engine from the gas tank. It is a compact 12-volt electric pump submerged in fuel. The average cost for a Chevrolet Cobalt Fuel Pump Replacement is between $1,243 and $1,425, with labor costs estimated between $185 and $233, and parts priced between $1,058 and $1,191.

Frequently asked questions