Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2012 Mazda Mazda3 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2012 Mazda Mazda3. The contact stated that after refueling the vehicle, there was an abnormal gasoline odor inside and outside the vehicle for the next 5 days, prompting the contact to only fuel the vehicle halfway. The contact observed fuel leaking underneath the vehicle near the fuel tank. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the welded fuel tank nipple fuel line connector. The contact stated that the component was cracked along the bottom of the weld. The contact was informed that the fuel tank needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 81,000.
After topping off my fuel tank at a gas station, fuel begins to leak from the top of the tank. Prior to noticing the leak, I had noticed a strong smell of gas after topping off and driving home. Symptoms include smell of gasoline, and a gasoline puddle on the ground. The fuel appears to be leaking from the top of the fuel tank, running down the side, and dripping onto the ground. Because of other nearby components that generate heat, this is a very dangerous situation that may lead to fires. Other 2012 Mazda 3 owners have experienced the same exact situation. The following threads shows comments from various people that have experienced the issue. The component that seems to have failed is the vent hose which allows gasoline to seep to the exterior of the tank. …
Our fuel tank is leaking for no reason. Brought it in last year (2024) for state inspections and let them know we smell gas when we park sometimes. They poke around and find nothing, but note there is a faint gas smell and to bring it to the dealer. We take it to Mazda to see if they can fix, they find nothing and charge my wife $250. Fast-forward to a year later, go for the same state inspection and we get failed. Our mechanic says theres a noticeable gas leak from the fuel tank and to take it to Mazda. There is clearly some issue with the fuel tank parts. The car itself only has 77k miles and it is 13 years old.
The car leaks gas when the tank is full and if the car is inclined slightly. I've noticed the problem several month ago with an occasional odor but finally saw the gas leaking recently when it was parked on a sloped street.
My wife was driving on the freeway - I was on the passenger side. This is the first time it happened. The car lost sort of reset itself - dash warning lights came on (according to my wife). Radio/cd stopped music - ABS light went on (that's all I can see from passenger side). My wife said others too but she was focused on the road because it was a construction zone. She was nervous and said the car was not responding to throttle. Luckily all went back to normal after 2 or maybe 3 seconds. The music came back on also. No check engine light or any sign of trouble. We pulled over and I checked the front to see if we hit something that could have caused it. Restarted the car - all seemed normal and reached our destination. This was our first 200 mile trip or more on this car. 1 day after arrival - I did a once over safety check (fluids, tire pressure, etc) nothing out of the ordinary. …
When decelerating, I'll push in clutch, apply brake, and shift to a lower gear. As I let out the clutch, car will sometimes lurch forward (as if I'm depressing accelerator even though I'm not). I must immediately depress clutch again and let out slowly to prevent the sudden surge in acceleration. Most often happens when I am coming out of a turn and begin to let out clutch. Also, at 3 1/2 years old, with 95,000 mostly highway miles, manual transmission has started popping out of 4th gear while driving. I'll be driving along and for no reason shifter will pop out of gear. Independent transmission shop said cause is likely bad bearings inside transmission and recommended replacement with manufactured transmission. I never had problems with my 2010 Mazda 5 with 5 speed manual transmission. …
Tl* the contact owns a 2012 Mazda 3. While driving at an unspecified speed, the check engine indicator illuminated. The vehicle was taken to jenkins Mazda of ocala [phone], located at 1740 sw college rd, ocala, fl 34471) where the fuel pump and gauge were replaced. The clutch was replaced six moths later. Five months later, the vehicle leaked fluid in the driveway. The vehicle was taken back to the same dealer where the technician diagnosed and replaced the driver's side transmission axle. Seven months later, while driving approximately 5 MPH, the vehicle made a clunking sound and was towed to the same dealer where the technician diagnosed and replaced the entire transmission. The manufacturer was made aware of the failures and offered to provide a discount towards the cost of a new vehicle. The offer was not acceptable. The contact's vehicle was not repaired. …
I just got off work and got in my car to leave. I turned on the car and everything seemed normal. I pulled out of the parking lot and as soon as I pulled up to the light, which was 1block away, my car shut off. I was just at the red light waiting then my car turned off and would not turn back on. All the power in the car was there but my car would just not turn back on, my vehical was being operated in the automatic position.this was dangerous because it was a Friday afternoon during the 5 o'clock traffic and I had all these vehicals lined up behind me honking and I had to push my vehicals off to the side and call a tow truck. My vehical was luckily on the city street.
Smell of fuel is very noticeable after filling up the gas tank. Further investigation indicates there is leaking somewhere near/around the tank but not on top where the fuel pump is. It is observed that the leak happens when tank is filled up full and more so if parked uphill. If filled up full, the leak seems to stop if car is parked downhill. Research indicates several other 2012 Mazda 3 owners have experienced the same issue. This is quite dangerous. For a part that is not moving or wearing out, whether the tank or attached hose, to break for a 7-8 year old car is unacceptable. This can cause a fire or explosion leading to death.
When I fill my gas tank, gasoline gushes or spurts out when the tank is full. I know normally the gas pump shuts off automatically when tank is full. The automatic shutoff when fueling does not work. Gas always overflows (regardless of what gas station I go to or if I hold the pump when fueling). It is a major overflow. Not a little gas comes out, a lot comes out, and forcefully. I cannot fill my tank more than 10 gallons. Gas will literally shoot out around the pump. Fuel has hit my legs and feet several times. The car is always turned off with the key removed from the ignition when fueling.
Fuel System complaints in other Mazda3 years
Frequently asked questions
How common are fuel system problems on the 2012 Mazda Mazda3?
NHTSA has 22 complaints about the fuel & propulsion system of the 2012 Mazda Mazda3, 10% of the model year's 226 complaints.
Is there a recall for 2012 Mazda Mazda3 fuel system problems?
No. NHTSA lists no fuel & propulsion system recall for the 2012 Mazda Mazda3, though it has 1 recall for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2012 Mazda Mazda3 fuel system problems start?
Half of the complaints with a recorded mileage happened before about 48,000 miles, and 22% before 25,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.