The last Stand in Left 4 Dead is not really a campaign it is supposed to be only for survival mode on Xbox Live. To cross the fence just wait for the computers to cross the Take a break and your character will cross the fence by himself
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You can get fuel by scavenging or buying fuel in the fuel trading post
Last Stand - Pull out your pistol before dying. Last Stand Pro - You can use the equipment that you have set for that class
In final stand you keep your weapon you were holding and eventually you can get up if you don't get shot. In last stand you pull out an M9 pistol and after about 15-20 seconds you automatically die. :P
There are a couple of ways to counter last stand. The first and most obvious is to go for headshots. Or when shooting someone put another couple of bullets into the target so that you will kill him and not put him in last stand. If there is someone in last stand do not charge him, rather keep some distance and fire from behind cover.
You die