There are 3 stored owner reports matching the fuel system leading-label group for the 2006 Mercury Mountaineer in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 3 of 3 matching reports.
Open the full vehicle complaint log (all categories)TL* THE CONTACT OWNS A 2006 MERCURY MOUNTAINEER. THE CONTACT STATED THAT THE AUTOMATIC FUEL PUMP SHUT OFF WOULD ACTIVATE WHENEVER FUEL WAS DISPENSED INTO THE FUEL TANK AT ANY FUEL LEVEL CAPACITY. IN 2009, THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER WHERE THE FUEL VALVE WAS REPLACED. THE SIMILAR FAILURE RECURRED AND THE VEHICLE HAD NOT BEEN REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE DEFECT. THE APPROXIMATE FAILURE MILEAGE WAS 50,000. UPDATED 03/16/12 *BF THE CONSUMER STATED THE VEHICLE WOULD ONLY TAKE A GALLON OF GAS. UPDATED 05/11/12
THE MERCURY MOUNTAINEER WILL NO LONGER TAKE IN FUEL PROPERLY. CAN NOT PUT IN MORE THAN A HALF A GALLON OF GAS AT A TIME. TOOK IT TO A MECHANIC AND THEY SAID THERE WAS NOTHING BLOCKING THE GAS FROM ENTERING THE TANK. HE SAID IT WAS THE AUTOMATIC FUEL SHUT OFF THAT WAS INSTALLED IN THE VEHICLE. HAVE NOT REPLACED IT YET. *TR
TL* THE CONTACT OWNS A 2006 MERCURY MOUNTAINEER. THE CONTACT STATED THAT SHE WAS UNABLE TO REFUEL THE VEHICLE. THE DEALER INFORMED THE CONTACT THAT THE FILLER NECK ASSEMBLY NEEDED TO BE REPLACED. THE MANUFACTURER HAD NOT BEEN NOTIFIED. NO REPAIRS WERE PERFORMED. THE CURRENT MILEAGE WAS 101,000 AND THE FAILURE MILEAGE WAS 60,000.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.