While there is an option to import choices from Seasons 1 and 2, because of an error I was not able to so I was forced to create a new backstory. What differences this will make for people reading these solutions, I can't say. None of the achievements are missable and you'll get them anyway, but your experience may differ somewhat from mine. I'll keep these solutions as general as possible to account for that.
Javi, Kate and Kate's two stepkids, Gabe and Mariana enter the salvage yard. A walker approaches and Javi puts it down in an easy 3 button not-that-quick time event. You even get a crowbar as an added bonus. Brooding teenager Gabe wanders off into the yard and after a brief conversation, we have control over Javi for the first time.
You can ignore the barrels, school bus, soiled mattress and all the other junk and proceed further into the yard and to the left to find two blue cars to siphon gas from. The left one has a walker hiding under it that's dealt with in a single
blow. Head past these cars to siphon more gas from a rusty old truck. You have enough gas to leave now if you want Head right past the large tires and green shipping container to find a ladder in the rear of the yard. Looking at it, then interacting with it again will prompt a choice to climb it or not.
If you want to talk with Kate or Mariana and haven't yet, do so now, but otherwise go ahead and climb the ladder, as Gabe comes along with you. Siphon gas from the ambulance, prying off the cap by holding
. While the fuel siphons, head to the left to draw out a walker that can be killed with a single button press. The nearby trailer door is locked and can't be pried open, but a peek through the window reveals a floor hatch. Move the wood by the stairs and enter the hole it was covering, then crawl to the hatch and enter the well-stocked trailer.
Poke around a bit until you're faced with a major decision: Side with the kids and stay the night, or side with Kate and get back on the road. I chose to stay the night, which results in a conversation with Kate. While retrieving the gas can...
The chapter ends with Javi being knocked unconscious.