It is possible to search for items that are available in various quantities.
Start with your initial search for your specific fuel pump. From the search results using a desktop browser, use the "Advanced" link in the upper right to go to the Advanced Search page. Scroll down to the Show Results section, and the last option is to select multiple items from minimum to maximum quantities. Enter a "2" into the minimum, then scroll to the bottom of the page and hit the blue search button. On the search results you should see a message at the top saying "Multiple listings are greater than 2" -- though in practice it actually means "at least 2".
If there are no results, it may be that no sellers are selling multiple quantities of the specific pump you need, in which case you may need to go back to your original search and make two separate purchases of one pump each.
