Gasoline Fuel System Problems of Mercury Mariner

Mercury Mariner owners have reported 12 problems related to gasoline fuel system (under the gasoline fuel system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Mariner based on all problems reported for the Mariner.

1 Gasoline Fuel System problem of the 2011 Mercury Mariner

Failure Date: 11/11/2025

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.

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2 Gasoline Fuel System problem of the 2011 Mercury Mariner

Failure Date: 09/22/2023

The contact owns a 2011 Mercury Mariner. The contact stated that while driving at an undisclosed speed, the vehicle lost significant 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, it 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.

3 Gasoline Fuel System problem of the 2008 Mercury Mariner

Failure Date: 01/10/2014

I pulled into a gas station to turn around. When I came to a complete stop and pressed the gas pedal to go, my gas pedal wouldn't budge it was like it was stuck. When I pulled on the highway it done it again but it took longer to get my gas pedal to press down. When I come to stop now I have to keep my foot on the break and the gas pedal to insure that it will go when I press the gas pedal.

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4 Gasoline Fuel System problem of the 2009 Mercury Mariner

Failure Date: 12/31/2013

Car engine stopped while driving at a low (10-20 mph) speed. Second time this happened. First time on 2011 replaced throttle body then. It happened again 12/31/2013. Ford service said throttle body needs to be replaced again.

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5 Gasoline Fuel System problem of the 2009 Mercury Mariner

Failure Date: 12/26/2013

While driving the Mariner at 45 mph on a busy street, the engine went into limp mode, lost all acceleration and slowed to 5 mph. I was nearly rear-ended by the truck behind me and was forced to pull up onto a sidewalk, damaging my tire. Pulled the codes on the car and got a p111 code. Did some searching on the internet and found that this is a common issue and an extreme safety hazard. I was very happy that I was the driver, and not my 16 year old daughter!!! this is the second safety issue we have had with this car in the last month -- earlier the power steering went out, again without any warning in traffic.

6 Gasoline Fuel System problem of the 2010 Mercury Mariner

Failure Date: 12/19/2013

The vehicle shut off while driving. This re-occurred several times during the next 8 days also while driving, one time while making a left hand turn across oncoming traffic. We researched the problem and had two estimates done and contacted Ford motor company. The throttle body had to be replaced and the repair cost us $400. 00 dollars. We have researched this problem and have seen that this is a very common safety problem. We spoke with our neighbors who have a Ford escape and already had their throttle body replaced as well for the same problem. We were told by the dealership that the new part is designed differently now, so this should not happen to us again. This has to be a recall item. It is obviously a manufacturing defect and is a huge safety concern. Ford should have to be responsible for these charges. We are very disappointed that Ford has not taken responsibility for this issue and that all of us have to pay for a defective system that Ford motor company knows is a problem, and could have been the cause of a major accident.

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7 Gasoline Fuel System problem of the 2006 Mercury Mariner

Failure Date: 12/04/2013

Stop at a red light the fuel peddle got stuck would not accelerate. Finally the Mariner started moving then had to come to a stop for stop sign same thing happened. Took it to the shop said the "throttle" was broken on this. This is a very dangerous can't drive it with the throttle being broken. Never had a problem with a throttle on any of my pass cars. Tracer,LS mustang I have these cars over the years. Bought all of my cars from the same dealership. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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8 Gasoline Fuel System problem of the 2010 Mercury Mariner

Failure Date: 11/20/2013

While driving in heavy traffic in center lane of three line highway. Vehicle suddenly lost power creating a emergency situation. I had to force traffic to allow me proceed to side of the road. Endangering myself and my family, I sat for about 30 min. Before I could move the vehicle.

9 Gasoline Fuel System problem of the 2008 Mercury Mariner

Failure Date: 11/15/2011

Accelerator gas pedal difficult to depress when weather gets cold (below 50f). It requires a harder press to engage and have the car move. It is dangerous when crossing an intersection after a stop. For the failure to work right keeps us in the intersection as we try to move out of the way of oncoming traffic. Having to press harder results in loss of control as we maneuver the car when turning at an intersection. We took the car to the dealer and they added a lubricant . It helped a little , but it was again difficult the next cold front that we had (temperatures below 50f). This condition graduated from the first winter we owned it in 2008 to this winter starting in 2011. It appears that the pedal works better after the car has been operating for a while, like 20 minutes or so.

10 Gasoline Fuel System problem of the 2005 Mercury Mariner

Failure Date: 10/01/2011

While stopped, the accelerator pedal sticks in the "up" position, and requires excessive force to move the vehicle. This sometimes results in excessive acceleration when the pedal becomes unstuck.

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11 Gasoline Fuel System problem of the 2005 Mercury Mariner

Failure Date: 12/15/2010

Gas mileage has suddenly and markedly plummeted on highway driving. Air filter replaced - no change. There has been no change in driving patterns. It has gone from around 20 hwy to around 10 hwy out of the blue - no engine/tranny/brakes issues or anything like that. Not a clue.

12 Gasoline Fuel System problem of the 2005 Mercury Mariner

Failure Date: 08/16/2006

Fuel mileage for 2005 Mercury Mariner is not even close to what is stated on window sticker. I completely understand that driving habits and condition apply, but when the window sticker reads 22 local 26 hwy and your actual is 16 hwy, there is something wrong. The car has been to the dealer on a regular basis and each time I have complained. They do there own test and state the truck is getting 22 mpg. I do all highway driving on a relatively flat surface all week long and only get 16 mpg. The tail pipe is full of soot and the dealer states no problem.


Other Common Gasoline Fuel System related problems of Mercury Mariner

Problem Category Number of Problems
Gasoline Fuel System problems
12
Tank Assembly problems
2

Mariner Service Bulletins
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