By Dave Brown
You're driving down a deserted road when your car hits a pothole and the engine cuts out. The car slowly rolls to a halt by the side of the road. You're alone, there's no cell phone reception and there are no buildings for miles. You have the choice of trying to fix the problem or sitting there alone for a very long time.
You recall that the engine stopped suddenly, with no loud bang or grating noise, so you conclude that the problem is probably not mechanical. There was no spluttering of the engine, the power cut out immediately, so in all likelihood it's not a fuel problem.
