A question came up on a recent Google Webmaster Office Hours asking about the fetch and submit feature.  The person had been told by his SEO agency that he needed to resubmit 10 pages every month to Google, and this despite also having a sitemap in place for the site.

So for the most part, you don’t need to use Google to submit your existing pages, that’s not something you need to do, in the sense that we automatically find those pages for the most part and index them automatically, you don’t need to manually do anything there on your end, especially not on a regular basis.

If there’s something very urgent you need to have updated in search as soon as possible, then this is a great feature to use.  But for normal changes on your website, for webpages that don’t change at all, you don’t need to do that.

Now, if you know these pages specifically haven’t been indexed by Google, despite being in the sitemap, then it would make sense to submit those pages to Google via fetch and submit.  But for pages that are already indexed, unless you are trying to force Google to update changed content on those pages, there is no need to resubmit those pages.