Does pulled pork in the slow cooker need liquid? No. When making pulled pork in the slow cooker I add a small amount of extra liquid for flavor but it's not a necessity. Because there is a good amount of fat and water in pork shoulder roasts you don't have to add extra liquid when making pulled pork.
Using Dr Pepper to make pulled pork isn't just a novelty, it's actually a really key ingredient. Not only does it help keep the pork moist, but it also injects a gorgeous sweet flavour.