Now here's an idea.
Get yourself a service & repair manual for your model of car [Gregoeies is one] & this will privide ALL the answers that you need.

That way you can avoid looking foolish asking these questions on this site & you will save yourself a bundle in the process.

In the absence of a manual, follow these simple steps.
1. Think [twice]
2. Remove the old unit by removing the two fuel lines, then undo the bolts / nuts, & withdraw the old pump.
3. Preferably with new gaskets & some sealant, reverse the process in step 2 using a servicable replacement pump.

Now that's not too hard is it?
Then drive down to the store & get the manual.
Chris