How to locate a fuel leak

Hello, if you have an actual fuel leak, this most often will not illuminate a "check engine" light. The problem is more that you have an external leak that must be found physically. There's no "test" that must be done, just a physical inspection. As far as filling tank completely leaving puddles -- is it the evaporative emissions system or fuel filler neck connection that is compromised? It's so hard to say without a good physical inspection. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops