You're driving along and your car starts to stutter and stumble. Then, just as soon as it starts, it goes away. You forget about it until it happens later in the week or the next day. Is your car ...

The fuel system business is booming. Aftermarket pumps, regulators, lines, fittings, tanks, injectors, fuel rails—even entire how-to books—revolve around the task of delivering more fuel to an engine.