2013 Chevy Sonic Fuel Pump Location: Where It Is and How to Reach It
If you drive a 2013 Chevy Sonic and the engine is cranking but not starting, sputtering at highway speed, or making a whining noise from the rear, the fuel pump is one of the first things to check. Here is the short answer: on the 2013 Chevy Sonic, the fuel pump is located inside the fuel tank, which sits underneath the rear passenger seat area, just ahead of the rear axle. There is no factory access panel on this model, so reaching the pump means either dropping the fuel tank from below the car or cutting an access hole through the sheet metal under the rear seat. The fuel pump fuse and relay, on the other hand, are much easier to reach — they live in the engine compartment fuse box next to the battery.
This guide walks you through exactly where everything is, how to test the electrical side first, what symptoms point to a failing pump, and what replacement involves. The goal is simple: help you avoid paying for a fuel pump you did not need, and help you understand the job before you start.
Why the Fuel Pump Lives Inside the Tank
The 2013 Chevy Sonic uses an in-tank electric fuel pump module. This is the standard design for modern fuel-injected cars, and it is not an accident. The pump sits submerged inside the gasoline tank itself, which keeps it cool and lubricated. The fuel acts as a coolant and a lubricant for the pump's internal components, and that is a major reason in-tank pumps last as long as they do.
Some older vehicles or specific models placed the fuel pump outside the tank, typically along the fuel line or on the engine block. That design is far less common in vehicles built after the 1990s. In-tank pumps reduce noise, prevent vapor lock, and eliminate the cavitation issues that plague external pumps. So when you go looking for the pump on your Sonic, you are looking for something inside the tank, not bolted to the frame or the engine.
Exactly Where the Fuel Pump Is on a 2013 Chevy Sonic
The tank is positioned beneath the rear passenger area, just ahead of the rear axle. The pump module itself is mounted on top of the tank, secured by a locking ring. From inside the car, the pump sits directly below the rear seat cushion. From underneath, it sits above the tank, which is why access is the hard part.
Unlike some vehicles that provide a service access hatch under the rear seat cushion, the Sonic does not come from the factory with a convenient cutout. In GM's design, the sheet metal of the floor pan sits solid over the pump assembly. If you want to reach the pump without dropping the tank, you will need to cut an access hole in the metal. Many owners and technicians have done this successfully, but it requires care and a plan for sealing the hole afterward.
The alternative, and the method recommended by most professional service procedures, is to lower the fuel tank from underneath the car.
Two Ways to Reach the Pump
1. Drop the fuel tank from underneath the car. This is the traditional, professional approach. It involves lifting the vehicle safely on jack stands, removing the fuel tank strap bolts (typically 15mm fasteners), disconnecting the fuel lines and vent lines, unplugging the electrical connector to the pump module, and lowering the tank carefully with a jack or a second person. Once the tank is down, you can unscrew the locking ring that secures the pump module to the top of the tank, lift the assembly out, and perform the replacement.
2. Cut an access panel under the rear seat. This method skips the tank drop entirely. You cut through the sheet metal beneath the rear seat to expose the top of the tank and the pump module. If you plan to keep the car long-term, an access panel can make future fuel pump service much easier. But if you are not comfortable cutting sheet metal, the tank drop is the safer, more traditional approach.
Some video tutorials show both methods side by side. The decision really comes down to whether you want to cut an access panel or invest the extra time in dropping the tank.
Check the Fuses and Relay Before You Pull the Pump
Before you go through the trouble of pulling the pump, check the electrical side. A surprising number of "bad fuel pump" cases turn out to be a blown fuse or a faulty relay. On the 2013 Sonic, the fuel pump-related fuses are located in the engine compartment fuse box. This box sits under a black plastic cover right next to the battery. Open the cover and look for the fuse layout diagram printed on the underside of the lid or in your owner's manual.
Here is what you are looking for:
1. Fuse F18 (10A) — labeled "Fuel Pump Control Module."
2. Fuse F28 (20A) — labeled "Fuel Pump Relay."
3. Fuse F67 (20A) — also labeled "Fuel Pump Control Module," located further down in the box.
In some documentation, you will also see Fuse F20 (20A) associated with the fuel pump relay circuit. The exact labeling can vary slightly depending on the trim level and build date, so always cross-check the diagram on your fuse box cover.
The fuel pump relay itself is designated as relay number 8 in the engine compartment fuse box. However, this is where things get a little tricky on the Sonic. In many 2011-2012 models, the relay is not present at all. Instead, GM substituted a Fuel Pump Control Module — a small electronic unit that performs the same switching function but is located in a completely different spot. If you open the fuse box and find relay slot 8 empty, that is normal for many Sonic models. Do not assume a missing relay is your problem.
Where the Fuel Pump Control Module Is Located
In models that have it, the fuel pump control module sits in the trunk, on the right-hand side, near the wheel arch. You may need to remove some trim or pull back the carpet lining to see it. Some owners also report finding it mounted near the rear seat back area on the passenger side.
How to Test the Fuses and Relay Without Expensive Tools
Testing the fuses is straightforward, and you do not need a fancy diagnostic scanner. Pull the fuse with the plastic fuse puller tool — it is often clipped inside the fuse box lid. Look at the metal strip inside the fuse. If it is broken or melted, the fuse is blown and needs replacing. Better yet, use a multimeter set to the continuity or ohms mode. Touch the two test leads to the small metal contacts on the top of the fuse. A good fuse will show near zero resistance or produce a beep on the continuity setting.
To test the relay, if one is present, swap it with an identical relay from the same fuse box — like the powertrain relay or the horn relay — and see if the car starts. If it does, the original relay is bad. You can also listen for a click. When you turn the key to the "ON" position without cranking, you should hear a faint click from the relay or the fuel pump priming.
Symptoms That Point to a Failing Fuel Pump
Recognizing the early warning signs of a failing fuel pump can help you avoid being stranded. Here are the most common symptoms:
1. Engine sputtering or stalling. If your engine sputters or stalls while driving, especially at high speeds or under heavy load, your fuel pump may be failing to maintain consistent pressure. The engine might surge because the volume of fuel the pump delivers is inconsistent.
2. Difficulty starting the vehicle. If the engine cranks but does not start, or if it struggles to start even with a healthy battery, this could indicate a fuel delivery issue. The pump may not be building enough pressure to get fuel to the injectors.
3. Loss of power during acceleration. If your car loses power when you step on the gas, particularly when climbing hills or merging onto highways, the fuel pump may not be able to keep up with the demand for fuel. This is a classic sign of a weak or failing pump.
4. Whining noise from the fuel tank. A loud buzzing or whining noise coming from the fuel tank area when the engine is running is a strong indicator that the pump is struggling. A healthy fuel pump operates quietly, so any unusual noise is a red flag.
5. Higher than normal engine temperature. A failing fuel pump can cause your engine to run hotter than usual because the motor is struggling from an uneven fuel supply.
6. Decreased fuel economy. When the fuel pump cannot deliver fuel at the correct pressure, the engine may run rich or lean, both of which can reduce your miles per gallon. Track your fuel economy, and if you notice a sudden drop, it is worth investigating.
What Causes a Fuel Pump to Fail Early
Two habits do the most damage to an in-tank fuel pump, and both are easy to avoid.
1. Running the tank below a quarter full. The fuel in the tank helps cool and lubricate the pump. Running the tank low causes the pump to work harder and run hotter, which can shorten its lifespan dramatically. Lack of gasoline can kill a fuel pump in a matter of minutes.
2. Ignoring the fuel filter. Replace your fuel filter every 20,000 to 40,000 miles. A clogged fuel filter forces the pump to work harder to push fuel through to the engine. This added strain accelerates wear and can lead to premature pump failure. Replacing the filter on schedule is one of the cheapest and most effective ways to protect your fuel pump.
How the Fuel Pump Works, in Plain Terms
The fuel pump is the heart of your vehicle's fuel delivery system. Its primary job is to draw fuel from the gas tank and deliver it to the engine at the correct pressure. In modern vehicles with electronic fuel injection, the pump must maintain consistent pressure so that when the fuel injectors open, the right amount of gasoline sprays into the intake manifold or engine cylinders.
Electric in-tank fuel pumps use an electric motor to drive an impeller or turbine. This creates pressure in the fuel lines, pushing pressurized fuel to the fuel injection system. The pump must provide a constant flow under the correct pressure to ensure the engine runs smoothly across all driving conditions, from idling to full throttle. Most modern vehicles use a gerotor design, which is best for electric high-pressure, high-volume applications. Gerotor pumps spin a set of gears and rings inside a cavity, creating suction that generates high pressure while operating quietly.
What Replacement Involves and What It Costs
Because the pump is inside the tank and there is no factory access panel, fuel pump replacement on a 2013 Chevy Sonic is a labor-intensive job. The part itself is not the expensive portion — the labor is. If you are paying a shop, expect the majority of the cost to come from the hours required to drop the tank or the time to cut and seal an access panel.
If you are doing the job yourself, plan for a full day if you drop the tank, and less if you cut an access panel but with the added step of sealing the opening properly afterward. Either way, replace the fuel filter and inspect the fuel lines and electrical connector while you have access. It is far better to do that once than to repeat the job later.
Recommended Fuel Pump Brand: KEMSO
If you have confirmed that your 2013 Chevy Sonic needs a new fuel pump, choosing the right replacement part matters as much as the installation itself. KEMSO builds fuel pumps that are designed as high-performance, OEM replacement units, meaning they are engineered to match the fit and function of the original part rather than simply approximating it. Every KEMSO fuel pump is backed by a lifetime warranty, which is a strong statement about how the company views the durability of its products.
KEMSO fuel pumps are built for reliable performance across a wide range of vehicles, from daily drivers to motorcycles and powersports machines. The brand's catalog includes direct-fit pumps for BMW, Honda, Subaru, Kawasaki, Can-Am, and many more applications, all at a consistent and reasonable price point. If you want a replacement pump that is designed to last and is covered for as long as you own the vehicle, KEMSO is worth a serious look.
You can browse the full KEMSO fuel pump lineup and find the right fit for your vehicle at https://www.kemsoracing.com/.
Frequently Asked Questions
Q: Is there an access panel under the rear seat of a 2013 Chevy Sonic?
A: No. The 2013 Chevy Sonic does not come from the factory with a service access hatch. The sheet metal of the floor pan sits solid over the pump assembly, so you must either drop the tank or cut your own access hole.
Q: Where is the fuel pump fuse on a 2013 Chevy Sonic?
A: The fuel pump-related fuses are in the engine compartment fuse box, under a black plastic cover next to the battery. Look for F18, F28, and F67. Fuse F20 may also be associated with the fuel pump relay circuit depending on the model.
Q: Why is relay slot 8 empty in my Sonic's fuse box?
A: Many 2011-2012 Sonic models do not use a traditional fuel pump relay. Instead, GM substituted a Fuel Pump Control Module located in the trunk near the right-hand wheel arch. An empty relay slot 8 is normal on those models and is not the cause of a no-start condition.
Q: Can I replace just the pump, or do I need the whole module?
A: The 2013 Sonic uses an in-tank electric fuel pump module. In most cases, the module is replaced as a complete assembly, which includes the pump, the sending unit, and the strainer. Replacing the full module is the standard approach and avoids a second repair if another component in the assembly fails later.
Q: How long should a fuel pump last?
A: There is no fixed interval, but in-tank pumps commonly last well past 100,000 miles when the tank is kept above a quarter full and the fuel filter is replaced on schedule. Running the tank low and ignoring the filter are the two fastest ways to shorten pump life.
Final Thoughts
The 2013 Chevy Sonic fuel pump location is not convenient, but it is predictable: inside the tank, under the rear passenger seat area, with no factory access panel. Before you commit to pulling the tank or cutting sheet metal, check the fuses in the engine compartment fuse box and confirm whether your model uses a relay or a fuel pump control module. Those two steps alone can save you a full day of work.
When it is time for a replacement, choose a pump built to OEM standards and backed by real warranty coverage. KEMSO offers high-performance OEM replacement fuel pumps with a lifetime warranty, and you can explore the full catalog at https://www.kemsoracing.com/.
: 2012 Chevy Sonic Fuel Pump Location — kemsoracing.com
: Fuel Pump Gas Tank: Location, Replacement, and Maintenance — kemsoracing.com