What should my fuel pressure reading be on my Mercedes?
Set you digital multimeter to 20-volt setting and connect it to the two main (black and red) lines going into the fuel pump. Turn the key to position II and look at the reading. You should get around 11-13 volt reading. Note that when you turn on the ignition, the fuel pump gets voltage for about 5 seconds to prime the system.
What kind of fuel pump does a Mercedes Benz use?
Under normal operation conditions, the fuel pump provides a constant flow of fuel. A failing fuel pump typically delivers too little fuel from the gas tank or in certain cases too much. Mercedes-Benz cars use an electrical fuel pump to pump the fuel to the fuel injectors.
What are the symptoms of lack of fuel pressure?
Symptoms include lack of acceleration when you press the gas pedal or vehicle trying to stall. The fuel pump is not providing the required fuel pressure to keep up with the engine demands. Mercedes may jerk during acceleration from a stop.
What should the fuel pressure be on a Mercedes Benz?
Try starting the motor and get a fuel pressure reading. As you can see from our video, the fuel pressure in our case was ranging between 54-56 PSI which is normal. At idle we were getting about 55 PSI with slight fluctuation (+/-2 PSI) when revving up the engine.
What causes a Mercedes Benz fuel pump to fail?
Typically problems related to the fuel pump and fuel pressure include: Under normal operation conditions, the fuel pump provides a constant flow of fuel. A failing fuel pump typically delivers too little fuel from the gas tank or in certain cases too much. Mercedes-Benz cars use an electrical fuel pump to pump the fuel to the fuel injectors.
Symptoms include lack of acceleration when you press the gas pedal or vehicle trying to stall. The fuel pump is not providing the required fuel pressure to keep up with the engine demands. Mercedes may jerk during acceleration from a stop.