This sounds like your problem.....Try this, only takes 5 minutes and probably whats wrong. The same thing happened to me, it was running perfect and died. There's something called an Inertia switch (google how to find it) the older rangers and bronco II's have them. It may think you have gotten in a accident and this device stops the fuel pumps. I literally pressed the reset button on the top of it and my truck started right back up after not being able to start at all.