Q: Have smoke and fuel coming out of exhaust pipe

The pressure regulator is usually located on the fuel rail and is easily accessible. But I wouldn’t change it unless you’ve done a fuel pressure test. There are a number of other things that could be wrong that would lead your truck to run too rich. The coolant temp sensor comes to mind, or an injector valve that is not closing or is leaking when closed. Trying to fix a car by replacing parts until it works again can get very expensive. You would, in most cases be better off to have it checked out before throwing more parts at it. You can have that done conveniently by contacting Your Mechanic. They can send a technician to your home or office to check out your Ranger and let you know what it is going to take to fix it.