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Fuel systemPart report

2008 Mercury Mariner Fuel system Problems

Complaints
10about this part
Share
2%of 461 total for the year
Median mileage
91,526miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 10 complaints about the fuel system of the 2008 Mercury Mariner, 2% of the 461 complaints for this model year. Where a mileage was given, the median is 91,526 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“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.”

NHTSA complaint #10559589, filed 2014-01, 91,526 miles

“My wife and I were driving home on the interstate. We had just merged to the passing lane to allow traffic merging from an on ramp to enter the interstate a vehicle next to us was doing the exact speed as we were which was 72 MPH set cruise control. I had vehicles approaching from the rear and since I was in the passing lane decided to speed up and get in front of the car beside us I pushed the accelerator on our 08 Mercury Mariner with a 3.0l engine to the floor and the car accelerated in front of the other car, when I lifted my foot off the accelerator the car continued to accelerate. …”

NHTSA complaint #10938967, filed 2017-01, 72,300 miles

“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). …”

NHTSA complaint #10450201, filed 2012-03, 10,000 miles

“Was traveling home for lunch, turning corner and vehicle suddenly went to idle. Pushed gas pedal and it went to the floorboard, but engine remained at idle. Was unable to accelerate at all. Was able to idle home blocking traffic as I went. Checked gas pedal and found that throttle cable had broken. The wire itself had broken. The rubber grommet and crimped end remained in-tacked. This could have been very dangerous if for instance I had been pulling onto freeway or crossing a busy intersection, or in heavy traffic. I believe this part should be inspected on all vehicles of this year and make. …”

NHTSA complaint #10490399, filed 2012-12, 35,324 miles

“The vehicle will stall when it comes to a stop, mid turn, slowing down, and sometimes accelerating. Several websites show 100's of complaints from people with the same issue. It is a may safety concern because it dies at any point while driving.”

NHTSA complaint #11317298, filed 2020-03, 117,000 miles

Related service bulletins

Fuel system: other model years

YearComplaintsShare of year
20112832%
20106323%
20093010%
2008102%
2006610%
2005710%

Other parts of the 2008 Mercury Mariner

Steering
297 complaints
Transmission and drivetrain
66 complaints
Brakes
35 complaints
Vehicle speed control
31 complaints
Electrical system
27 complaints
Other or unknown
20 complaints
Engine
14 complaints
Air bags
8 complaints
Engine cooling
6 complaints
Electronic stability control
5 complaints
Body and structure
5 complaints
Suspension
5 complaints

← All problems reported for the 2008 Mercury Mariner

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology