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 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 I do if my fuel pump is not working?
The first thing that you should do is check the fuel pump fuse. If the fuse is good, you will need to test the fuel pressure. If you performed a fuel pressure test and find out that the fuel pump is not generating fuel pressure, don’t rush into the conclusion that the fuel pump is bad. Perform the following test before you replace the fuel pump.
How can I tell if my fuel pressure sensor is correct?
First, make sure that the fuel pressure sensor is correct. Check the fuel pressure with a manual fuel pressure gauge to figure out if you can find any problems with the pressure. If so check fuel pressure regulator.
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.
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.
The first thing that you should do is check the fuel pump fuse. If the fuse is good, you will need to test the fuel pressure. If you performed a fuel pressure test and find out that the fuel pump is not generating fuel pressure, don’t rush into the conclusion that the fuel pump is bad. Perform the following test before you replace the fuel pump.
What happens when the fuel pressure regulator goes bad?
Fuel is the lifeblood of a vehicle’s engine. It is mixed together with air to produce energy that drives the car. There are many components of the fuel delivery system. Malfunction in any of these components can result to problems in fuel delivery. One of the most critical components is the fuel pressure regulator.
How to troubleshoot a Mercedes Benz fuel pump problem?
Troubleshooting a bad fuel pump problem on a Mercedes-Benz is easy. This is a job where you need to be extremely careful because you will work near fuel and there is always the risk of fire. It is recommended that you empty the tank or have the fuel tank near empty when you replace the fuel pump.
Do you need a fuel tester for a Mercedes Benz?
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. This test applies to Mercedes-Benz vehicles equipped with 4-cylinder, V6, V8 and V12 gasoline engines such as M112, M113, M119, M104 M272 and M273.
What causes lack of acceleration in a Mercedes?
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. Happen when you hit the gas pedal to the floor.
What should I do if my Mercedes fuel pressure is zero?
If your Mercedes doesn’t start, check the fuel pressure. If you are getting zero reading, you either have an electrical problem or a bad fuel pump. If the check engine light is on, consider yourself “lucky” as it can make your diagnosis easier. Note that not all faults will trigger the check engine light.
Troubleshooting a bad fuel pump problem on a Mercedes-Benz is easy. This is a job where you need to be extremely careful because you will work near fuel and there is always the risk of fire. It is recommended that you empty the tank or have the fuel tank near empty when you replace the fuel pump.
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. This test applies to Mercedes-Benz vehicles equipped with 4-cylinder, V6, V8 and V12 gasoline engines such as M112, M113, M119, M104 M272 and M273.
What happens if fuel falls on hot engine parts?
If fuel falls on hot engine parts, you may cause a fire. Keep a fire extinguisher nearby in case of emergency. Never carry this test if the engine is hot. Open the hood of your Mercedes-Benz. Remove the engine cover. The engine cover can be pulled up as it is held in place with four tabs and no screws. Locate the fuel test port on the fuel rail.
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.
What are the symptoms of a bad fuel pressure regulator?
Another symptom of an issue with the vehicle’s fuel pressure regulator is fuel leaks. If the fuel pressure regulator’s diaphragm, or any of the seals fail, fuel leaks can occur.
Where is the fuel regulator on a Mercedes CDI?
The Mercedes CDI series of diesel engines have an electronically controlled fuel pressure regulator mounted on the end of the fuel distribution rail. This controls, as the name suggests, the fuel rail pressure.
How can you tell if a Mercedes pressure regulator is failing?
One way to tell if it’s a fuel leak is the noticeable smell of fuel when you’re in your Mercedes with it either running or parked. Another telltale sign of fuel pressure regulator problems or damages is black smoke. If the regulator fails or is leaking then it may lead to black smoke coming from the exhaust system.
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.
What happens when fuel pressure regulator goes bad?
A misfiring engine can lead to faster wear and tear on engine components and lead to expensive repairs next time you take your car in for service. A common area for the fuel pressure regulator to experience issues are in the diaphragm or in any of the seals and when this happens then a fuel leak will usually occur as well.