At the end of the game, there is a roadblock before you get the key, which needs to be ignited with a lighter.
In reality, in the rainy and hot rainforest, these things are completely soaked. Theoretically, even if you have gasoline, you can't successfully ignite the roadblock. The best way is to find other ways to destroy the roadblock. For example... C4 and TNT. Or just the plot, let the infected zombie elephant crash here.