Chevrolet Volt Fuel Tank Size – Capacity, Range, And Maintenance Guide
The Chevrolet Volt utilizes a specialized fuel tank with a capacity of either 8.9 or 9.3 gallons, depending on the model year. This pressurized system is engineered to keep gasoline fresh during extended electric driving periods while ensuring the vehicle is ready for long-range travel.
If you have ever wondered why your plug-in hybrid has such a specific fueling process, you are not alone. Most owners choose this vehicle to minimize their trips to the pump, but knowing the chevrolet volt fuel tank size is essential for planning road trips and maintaining the fuel system. In this guide, I will walk you through the specifications, the unique pressurized technology, and how to keep your fuel system in top shape.
Whether you are a new owner or a DIY mechanic looking to troubleshoot an EVAP code, understanding these details is the first step. We will explore why the tank is smaller than a traditional car’s and how the car manages fuel that might sit for months. Let’s dive into the technical specs and practical tips for your Volt.
Understanding the chevrolet volt fuel tank size by Generation
The Chevrolet Volt was produced in two distinct generations, and the fuel capacity changed slightly between them. Engineers adjusted the tank size to balance weight, battery placement, and total driving range. Because the Volt is a range-extended electric vehicle, it does not need the massive tanks found in full-size SUV efficiency leaders like the full-size SUV efficiency models you might see on the road.
First Generation (2011–2015)
The first-generation Volt featured a 9.3-gallon fuel tank. This generation was designed with a heavy emphasis on the “T-shaped” battery pack that ran down the center of the car. The 9.3-gallon capacity provided a total driving range of approximately 380 miles when combined with a full battery charge.
Second Generation (2016–2019)
When the second generation debuted, the chevrolet volt fuel tank size decreased slightly to 8.9 gallons. Despite the smaller tank, the overall range increased significantly due to a more efficient engine and a larger battery. This model could travel over 420 miles on a full charge and a full tank of gas.
It is important to note that both generations require premium fuel (91 octane or higher) for the first generation, while the second generation can run on regular unleaded. This change in fuel requirement is often more important to owners than the small difference in tank volume.
The Engineering Behind the Pressurized Fuel System
One of the most unique aspects of the Volt is its Pressurized Fuel System. In a standard car, the fuel system is vented to the atmosphere through a charcoal canister. However, because a Volt might go weeks or months without burning a drop of gasoline, the fuel needs protection from oxidation and evaporation.
The system uses a Fuel Tank Isolation Valve (FTIV) to seal the tank completely. This keeps the gasoline under pressure, which prevents the lighter components of the fuel from evaporating. It essentially “cans” the fuel like a preserve, keeping it fresh for up to a year.
When you press the fuel door release button inside the cabin, you might notice a delay. The car is actually using the Fuel Tank Pressure Sensor to monitor the depressurization process. You must wait for the “Ready to Refuel” message on the dashboard before the Fuel Filler Neck will unlock.
Key Components of the Volt Fuel System
To maintain the chevrolet volt fuel tank size efficiency, several specialized parts work behind the scenes. If you are a DIYer, knowing these parts will help you diagnose issues like a fuel door that won’t open or a check engine light.
- Fuel Tank Isolation Valve (FTIV): This is the gatekeeper of the system. It stays closed to maintain pressure and opens only when the engine is running or during refueling.
- Vapor Canister: This contains activated charcoal to trap any fuel vapors that escape when the system is depressurized.
- Fuel Pump Module: Located inside the tank, this module delivers fuel to the engine and houses the Fuel Level Sensor.
- Fuel Tank Straps: These metal bands secure the tank to the chassis. In rust-prone areas, these should be inspected for corrosion during routine maintenance.
If the FTIV fails, you might experience difficulty refueling or encounter an EVAP-related error code. Always ensure the Fuel Filler Neck area is clean and free of debris to prevent contaminants from entering this sensitive system.
Managing Fuel Maintenance Mode (FMM)
Because the Volt is so efficient, it is possible for the gasoline to become “stale” if it sits for too long. To prevent engine damage, Chevrolet programmed a feature called Fuel Maintenance Mode. This is a common point of confusion for new owners who see their engine start even when the battery is full.
The car’s computer tracks the average age of the fuel in the tank. If the fuel reaches approximately one year of age, the car will enter FMM. It will run the engine to consume the old fuel and encourage you to add fresh gasoline. This is why it is often recommended not to fill the tank to the brim if you only drive short distances on electricity.
By keeping less fuel in the tank, you can ensure that you cycle through it faster. However, never let the tank stay completely empty, as the Fuel Pump Module relies on the gasoline for cooling and lubrication. Keeping at least a quarter tank is a good rule of thumb for any vehicle, including a mid-size truck fuel economy specialist like the mid-size truck fuel economy champion.
Troubleshooting Common Fuel System Failures
Even with advanced engineering, things can go wrong. If you see a check engine light, a common culprit on the Volt is the P0451 OBD-II Code. This code relates to the Fuel Tank Pressure Sensor performance.
Diagnostic Decision Table
| Symptom | Potential Cause | Recommended Action |
|---|---|---|
| Fuel door won’t open | System failed to depressurize | Check FTIV and pressure sensor; use manual release in trunk. |
| P0451 OBD-II Code | Erratic pressure sensor readings | Inspect wiring harness and sensor for moisture or damage. |
| Gas smell near rear wheel | Leaking Vapor Canister or lines | Inspect EVAP lines and canister for cracks or saturation. |
| Engine starts unexpectedly | Fuel Maintenance Mode (FMM) | Check fuel age; add fresh gas to clear the mode. |
If you encounter the P0451 code, it often means the sensor is detecting pressure when it expects a vacuum, or vice versa. Since the Volt tank is pressurized, this sensor is under more stress than in a standard vehicle. Always check for software updates first, as GM released several service bulletins to recalibrate the sensor logic.
Inspecting Your Fuel System for Safety
Safety is paramount when dealing with a Pressurized Fuel System. If you are performing your own maintenance, never attempt to remove the fuel cap or disassemble fuel lines while the system is under pressure. Always use the interior release button to vent the system safely.
Regularly inspect the Fuel Tank Straps for any signs of sagging or heavy rust. If a strap fails, the tank could shift, damaging the high-voltage battery cables that run nearby. This is a critical safety point unique to the Volt’s architecture.
Additionally, check the Fuel Filler Neck for any signs of corrosion or blockage. A small leak here can trigger a “Check Gas Cap” message or an EVAP leak code. Keeping these components clean and secure ensures your Volt remains efficient and safe for years to come.
Frequently Asked Questions About chevrolet volt fuel tank size
How many gallons does a Chevy Volt hold?
The chevrolet volt fuel tank size depends on the year. 2011–2015 models hold 9.3 gallons, while 2016–2019 models hold 8.9 gallons. These smaller sizes are intended to reduce vehicle weight since the car primarily relies on electric power.
Why does the Chevy Volt have a pressurized gas tank?
The tank is pressurized to keep the gasoline fresh. Since Volt owners often drive on electricity for weeks at a time, the pressure prevents the fuel from oxidizing and the volatile components from evaporating, ensuring the engine runs smoothly when needed.
Can I use regular gas in my Chevy Volt?
For the first generation (2011–2015), premium fuel is required to prevent engine knock and help the fuel last longer. The second generation (2016–2019) was redesigned to run safely on 87-octane regular unleaded gasoline.
What should I do if my fuel door won’t open?
First, ensure the car is in Park. If the button fails, there is a manual release cable located in the trunk behind a small plastic access panel on the driver’s side. Pulling this will mechanically unlatch the door.
Does the Chevy Volt need a fuel stabilizer?
Generally, no. The pressurized tank and the Fuel Maintenance Mode are designed to handle fuel longevity. However, if you know the car will sit for more than a year without any use, a stabilizer might provide extra peace of mind.
Final Thoughts on the Chevrolet Volt Fuel System
Understanding the chevrolet volt fuel tank size and its associated technology is key to a great ownership experience. While 8.9 to 9.3 gallons might seem small compared to a traditional sedan, it is the perfect “reserve tank” for a vehicle that prioritizes electric efficiency. By respecting the pressurized system and responding promptly to maintenance modes, you can enjoy the best of both worlds.
Keep an eye on your Fuel Level Sensor and Vapor Canister to ensure the EVAP system remains sealed and functional. If you ever feel uncomfortable working with the pressurized lines, do not hesitate to contact a certified Voltec technician. Stay safe, keep your fuel fresh, and enjoy the silent ride of your electric-drive machine!
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