Ford’s (NYSE:F) recall of 850,000 vehicles for a fuel pump defect marks the latest in a string of recalls that have raised fresh concerns about the automaker’s quality control and brings its six-month total higher than any other automaker’s full-year tally.

Ford is recalling potentially more than 850,000 of its vehicles due to possible fuel pump failures, according to the National Highway Traffic Safety Administration .

The automaker says its quality is improving, and the company expects its number of recalled vehicles to drop over time.

Two examples of the Ford GT didn't get the fix meant for them several years ago due to a botched recall campaign