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. *TR
2005 Mercury Mariner fuel system problems
moderate 4 complaints filed with NHTSA · avg repair $1,200
Complaints
4
Recalls
0
Crashes
0
Avg fix
$1,200
What owners are reporting 1 most recent
Common questions
How serious is the fuel system problem on the 2005 Mercury Mariner?
It's a documented issue but not catastrophic. 4 complaints have been filed. Repairs average $1,200 and most owners catch it before it causes a breakdown.
At what mileage does the fuel system typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $1,200 for fuel system repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to fuel system?
No active recalls currently cover fuel system issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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