2024 Toyota Grand Highlander Fuel System Problems

Your catalytic converter failed at around 31,000 miles, well before typical wear, and Toyota's dealership refused warranty coverage by claiming contaminated fuel caused the damage—but provided no test results or evidence to support this claim. Catalytic converters are emissions parts expected to last much longer and are typically covered under extended warranties. You're concerned this may be a broader issue affecting other owners.

Your fuel tank won't fill completely—even though it should hold 17 gallons, you can only get about 10 gallons in before it stops. Your Auto START/STOP feature also isn't working properly. The dealer checked it out but couldn't figure out what's wrong. The issue may involve a fuel filler neck blockage, fuel pump malfunction, or electrical issues with the engine control system.

Your fuel tank isn't filling beyond about 12 gallons even when the low fuel light comes on, despite the advertised 17-gallon capacity. You're experiencing significantly lower fuel economy than advertised—as low as 10.3 MPG on individual trips versus the advertised 26-27 MPG—and your car's range estimates don't match reality (around 280-300 miles instead of the advertised 450 miles). The dealership confirmed 3-5 gallons remain in the tank when the display shows only 5 miles until empty, suggesting the fuel level sensor and/or fuel system capacity may not be functioning as designed. This may require diagnosis and repair of the fuel tank level sensor, fuel pump assembly, or fuel system calibration.

Your fuel tank isn't filling to its full 17.2-gallon capacity—it stops at around 12 gallons, forcing you to partially withdraw the nozzle to add more fuel, which causes gas to overflow. This limits your actual driving range to 230-270 miles per tank and makes it difficult to fill up when your estimated miles remaining are low, creating a messy and potentially unsafe refueling experience.

Your vehicle emits strong gasoline fumes when you park it in your garage, so much that the entire garage fills with the smell. You've had to park outside for several hours for the fumes to dissipate, and the dealership has confirmed this is a known issue affecting multiple vehicles. This is a safety concern because the fumes could create an explosion risk in enclosed spaces like your garage.

Your 2024 Toyota Grand Highlander Hybrid fuel tank is advertised as holding 17.2 gallons, but you can only fill it with 11 to 11.5 gallons at most. This suggests about 6 gallons of fuel is trapped in the tank and inaccessible to your engine. You've brought the vehicle to the dealer three times since November 2023 without resolution, and other owners report the same issue. The fix will likely require the dealer to inspect and repair the fuel system's ability to access the full tank capacity.

Your vehicle hesitates and won't accelerate for about 5 seconds after you press the gas pedal, especially on hot days when the air conditioner is running hard. This delay in acceleration is intermittent but has happened multiple times. The issue may involve the engine's fuel delivery or air intake system struggling under heat and AC load.

Your hybrid's fuel tank doesn't fill completely at the pump despite having a 17.8-gallon capacity — the auto-fill feature stops after only 12 gallons, leaving you with a 330-mile range instead of the expected 500 miles. You can get closer to a full tank by manually pumping slowly without using the auto-fill lever, but this is inconvenient and means more frequent gas station visits. The issue appears to be that fuel isn't settling in the tank fast enough during normal filling, causing the pump to shut off prematurely. A Toyota service center has confirmed the problem, though Toyota says they don't currently have a fix available.

Your Grand Highlander's fuel tank is advertised as 17.8 gallons, but you can only fill it with about 13.5 to 14 gallons when the tank reads empty. This means your vehicle isn't delivering the advertised fuel capacity and mileage range. Other owners report the same issue, and Toyota dealerships are aware but haven't taken action to fix it. A fix may involve inspecting the fuel tank sender unit, fuel pump assembly, or recalibrating the fuel gauge system.

Your car smells strongly of gasoline after driving for 10-30 minutes on hot afternoons in Arizona, and the smell persists in your garage after parking. The dealership confirmed the issue and said Toyota attributes it to excessive heat, suggesting you use higher-quality fuel (though you're already using premium brands like Chevron and Costco). This appears to be a recurring problem among other Grand Highlander owners in hot climates. The fix will likely involve Toyota inspecting and potentially replacing fuel system components like the charcoal canister or fuel lines that may be allowing vapor to escape in extreme heat.

I have a 2024 Grand Highlander and when I get to empty the most I can put in it is 10 1/2 gallons of gas. Toyota said I had a 17.2 gallon gas tank. I’ve called Toyota.

Your fuel tank is supposed to hold 17.2 gallons, but you can only fill it with a maximum of 12-13 gallons even when the tank appears completely empty. The dealer confirmed the tank capacity is correct at 17 gallons, suggesting there may be an issue preventing the tank from filling to its full capacity. This could indicate a problem with the fuel filler neck, vent system, or internal tank structure that's blocking fuel from entering.

Your fuel tank should hold 17 gallons according to the specs, but when you fill it up after the gauge shows empty (with about 20 miles of range left), it only takes about 11 gallons to reach full. This is a significant shortfall—you'd expect around 15 gallons even accounting for a reserve. Either your tank is smaller than advertised or the fuel level sensor isn't reading correctly.

Your Grand Highlander's fuel tank isn't filling to its stated capacity. According to the owner's manual, the tank holds 17.2 gallons (with 2.6 gallons reserved), meaning you should be able to fill up 14.6 gallons when the empty light appears — but you can only fill about 11.5 gallons. This makes it difficult to know your actual fuel range and can be concerning on long trips with few gas stations. The issue may be related to air not properly venting from the tank during refueling, and Toyota needs to investigate the root cause.

Your fuel gauge is reading incorrectly—it shows only a half tank when the tank is actually full, and displays empty when there's still about 10 gallons remaining. This causes you to refuel much more frequently than needed, getting only about 170 miles per tank instead of the expected 400+ miles for a hybrid. The issue appears to be with the fuel level sensor or gauge display system that needs recalibration or replacement.