What does it mean to have a fault in the fuel system?
The vehicle will continue to maintain a closed loop status, but with a “fault” indicated. It serves as a valuable clue that states the fuel system status must be addressed. The goal of the processor is to protect the catalytic converter with the best possible fuel system strategy.
What’s the fuel pressure on a Mercedes Benz?
A great and affordable gauge that we have used in the past is this Actron Fuel Pressure Gauge which works on Mercedes-Benz cars. Turn the engine off and connect this gauge to the Schrader valve test port shown in the picture below. Start the car and you should be able to get around 60 psi.
What are the symptoms of a bad fuel pump?
The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel. This symptom can also be caused by a wide variety of other issues, so having the vehicle properly diagnosed is highly recommended. 3. No noise from the fuel pump
What does the diagnostic code for fuel system mean?
The descriptors for these codes indicate that there is a lack of switching from the upstream oxygen sensors as indicated by the processor. We begin our analysis by checking to see if the fuel system is working as designed.
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.
How does a Mercedes Benz Fuel pressure test work?
A fuel pressure check on your Mercedes-Benz will tell you if the fuel pressure is withing range or not. For this test, you will need a fuel pressure gauge. The Actron CP7818 fuel tester works on most Mercedes-Benz and has the required Schrader valve required for MB cars.
What is the OBD2 code for a Mercedes fuel pump?
OBD2 Code P0627 Mercedes definition: ECM detected an open or short in the fuel pump relay circuit
What do I need to troubleshoot my Mercedes Benz?
Troubleshooting fuel related problems is not very difficult and you can check the fuel pressure yourself. Checking the fuel pressure is very simple. For this test, you will need a fuel pressure gauge. What you need is a fuel pressure gauge with Schrader valve adapter.