On October 30, 1970, less than two months after introduction, 26,000 Pintos were recalled to address a possible problem with the accelerator sticking on once engaged at more than halfway.[22][23][24] On March 29, 1971, Ford recalled all 220,000 Pintos manufactured before March 19, 1971, to address a problem with fuel vapors in the engine air filter possibly igniting by a backfire through the carburetor.[25][26][27]