Your fuel pump is kind of like one of those enormous guys at the gym: All brawn, no brain. And while your car couldn’t run without a fuel pump, it requires a BMW Fuel Pressure Regulator to take the high-pressure gasoline supplied by the fuel pump and deliver it at a steady pressure to the rest of the fuel system. Since the fuel injection components are very sensitive to pressure and volume, the BMW fuel pressure regulator ensures that the rest of the system gets its gasoline at a precise pressure; no more, no less.

Obviously, if your BMW fuel pressure regulator goes on the fritz, you pretty much get one of two conditions: Too much pressure or too little pressure. Either one can cause problems like flooding, hesitation, stalling, or a no-start condition. Fortunately, the fuel pressure regulator sits under the hood where it’s convenient to get to, and it’s fairly easy to test. Just hook up a fuel pressure gauge designed for a fuel injection system and compare the readout to what’s specified for your car. A new BMW fuel pressure regulator may be required if the reading is off.