The definition of a rule is  an official regulation, code of regulations or set practice. An example of a rule is that a red light means stop. An example of a rule is an employer demanding their employees arrive at 8am.
New injectors cost anywhere from $80-$120 apiece, making their replacement a somewhat pricey endeavor. There are three types of injector leaks-it can leak fuel into the manifold from the nozzle, it can leak fuel into the engine compartment from the fuel rail, and it can leak air (vacuum leak) from the manifold.
It goes on to determine the cost of the fuel pump as well as the labor charges. Here are a few examples. For a BMW 750i, the pump would cost around $475 and the mechanic would charge about $175, resulting in a total bill of $650. For a Kia Rio, the same would be $225 and $125 respectively, amounting to a total of $350.