What presidents never voted for themselves as president under a party banner in a general election.
George Washington (independent, no popular vote in Virginia), John Adams (no popular vote in Massachusetts), Thomas Jefferson (no popular vote in Virginia), James Madison (no popular vote in Virginia), James Monroe (no popular vote in Virginia)
John Tyler (was William Henry Harrison's vice president, Harrison died and Tyler did not stand in the next election), Andrew Johnson (was Abraham Lincoln's vice president, Lincoln died and Johnson did not stand in the next election), Chester A. Arthur (was James Garfield's vice president, Garfield died and Arthur did not stand in the next election)
So by my count eight.
(Fillmore ran for the Know Nothings in 1856 and Ford ran in 1976.)