Which parts fail
Components named in complaints (fuel pump, injectors, fuel tank, hybrid and EV propulsion).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2011 Mercury Mariner owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2011 Mercury Mariner. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power and failed to accelerate above 10 MPH. The contact was able to pull to the shoulder of the roadway, after which the vehicle stalled. After restarting the vehicle, the vehicle briefly returned to normal functionality, but the failure reoccurred. The vehicle was taken to an independent mechanic, who diagnosed a failure with the throttle body. The vehicle was not repaired. After investigating the failure, the contact related it to Customer Satisfaction Program 13N03, but the VIN was not included. The manufacturer was notified of the failure but referred the contact to the NHTSA hotline for assistance. The failure mileage was 116,000.
The contact owns a 2011 Mercury Mariner. The contact stated that while driving at an undisclosed speed, there was a strong fuel odor inside the vehicle. In addition, the contact stated that the fuel odor was noticeable all the way to the rear seat. The vehicle was taken to the dealer; however, the contact was informed that the tools needed to perform the repair were not available. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The contact was informed by the Insurance Provider of an unrepaired recall, under NHTSA Campaign Number: 16V777000 (Fuel System, Gasoline). The manufacturer was not made aware of the failure. The failure mileage was unknown.
Tl* the contact owns a 2011 Mercury Mariner. The contact stated that the vehicle stalled while being operated at various speeds. The check engine and check fuel intake warning indicators illuminated. The contact received notification of NHTSA campaign number: 16V777000 (fuel system, gasoline); however, the parts to do the repair were unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The sheehy Ford dealer was contacted and confirmed that the parts were not available for the recall remedy. The manufacturer was not made aware of the issue. The failure mileage was approximately 140,000. VIN tool confirms parts not available.
The throttle is not working right. I was almost in 2 accidents because of this. I step on the gas and nothing happens. I hear that 1000s are having the same problem but no recall. This is very dangerous when in a 75 MPH zone and suddenly no power.
When I put gas in my car i smell it while driving like it's leaking and it say on my dash board check fuel inlet
The fuel system is not working properly.I'm scared to drive it anymore.i can't even put gas in it.
I was driving on the interstate at about 65mph. Vehicle became unresponsive to the gas pedal input. Check engine (yellow wrench) light came on. I had to cross over to the right side of the road, while coasting with the engine at idle. Came to a stop and that's when I realized that the car was at idle and would not respond to the gas pedal. Turned off the car, and it restarted after a longer than normal amount of cranking. Check engine light was out. Car drove normally to my destination. Took car to alan vigil Ford. They said it has no stored codes, but it would need the throttle body replaced, but it was not covered under the 5/60K powertrain warranty. I also called Ford customer service and they said the same thing. They charged $99.95 diagnostic fee for this. They told me to keep the receipt, incase of a future recall. …
While driving down the highway, in my 2011 Mariner it suddenly lost the power to accelerate (engine still running). The wrench light illuminated at this time. Pressing on the accelerator did nothing. Fortunately there was nothing behind me so I coasted about 1/4 mile to the next turn off and coasted off the highway. Then I turned the vehicle off, waited a few minutes and restarted it. I drove about 20 miles home with no other occurrence. The next day (August 14, 2013) I drove about 20 miles to work with no problems. That afternoon I left work and drove about 2 miles at 25 MPH and it lost all acceleration power again (motor still running). I turned it off and restarted it. I drove another 2 miles at 25 MPH and it lost acceleration power again, but this time both the wrench light and the check engine light came on (engine still running). …
Driving at 40 MPH car stalls, pull over, car starts up engine lite on, (sat) take to dealer on mon (12/15/2014), explain to dealer, they call 3 hours later to say "purge valve needs to be replaced"OK this should be covered right? She says no! The cost to you will be $320.33. I told her this is part of the emissions, it has to be, she said no its not! I purchased this car from this dealer 3 1/2 years ago, (bought is new) still underwarranty.. But this is not covered! The 800 number to fords blew me off! And said what the dealer says goes!>. Why did she suggest I call them then! (not good customer service) I was hoping for explanation! Please help, this should be covered. Look at your on line complaints about this! Shame shame shame. Of course I paid it, I need my car! Please note I was told that there were at 5 or more cars with the same/similar problem.
Tl* the contact owns a 2011 Mercury Mariner. The contact stated that NHTSA campaign number: 16V777000 (fuel system, gasoline) exceeded a reasonable amount of time for repair. The contact received the recall notification in January of 2017. The contact spoke with ourisman Ford & Lincoln (6129 richmond highway, alexandria va, 22303, [phone]) several times concerning part availability. The dealer stated that parts were unavailable for the repair. The dealer informed the contact to call back in two weeks. The contact called back in two weeks and was informed that parts were still unavailable. The manufacturer was contacted and provided a case number. The manufacturer informed the contact that the situation concerning part availability was escalated. The contact had not experienced a failure. Parts distribution disconnect.
Related recalls
Fuel system, gasoline › Delivery › Fuel pump
Ford Motor Company (Ford) is recalling certain model year 2010-2012 Ford Escape vehicles manufactured February 26, 2009, to April 29, 2012, and 2010-2011 Mercury Mariner vehicles manufactured February 25, 2009, to December 12, 2010. On vehicles with a 3.0L engine, the Fuel Delivery Module (FDM) may crack, causing a fuel leak.
Remedy: Ford will notify owners, and dealers will replace the FDM flange with one that has a redesigned fuel supply port, free of charge. Remedy parts are currently unavailable.
Fuel System complaints in other Mariner years
Frequently asked questions
How common are fuel system problems on the 2011 Mercury Mariner?
NHTSA has 28 complaints about the fuel & propulsion system of the 2011 Mercury Mariner, 32% of the model year's 87 complaints. The component named most often is delivery (1 mentions).
Is there a recall for 2011 Mercury Mariner fuel system problems?
Yes — NHTSA recall 16V-777 (fuel pump, Oct 26, 2016). Recall repairs are free at authorized dealers.
At what mileage do 2011 Mercury Mariner fuel system problems start?
Half of the complaints with a recorded mileage happened before about 46,000 miles, and 6% 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.