as far as the CV boot, i definitly would suggest in getting a reman halfshaft. if the boot has been torn for awhile , it gets dirt and water inside of it and that is notm good. NAPA has reman halfshafts for about 70 bux and they have a lifetme warr on them too. by the time you get a quality CV boot and have it installed, you are farther ahead to get the halfshaft.
as for the fuel filter, i replace them every 12 months or 12,000 miles. because even idling, the fuel is being looped back into the tank and into the filter again and again. filters are cheap, plus a clean filter helps the fuel pump too, a fuel pump is lazy, it only works as hard as it has to. the more dirt that is in the filter, the harder it has to push the fuel, ending in premature pump failure.