When do you need a Mercedes fuel pressure test?
If you suspect that your fuel pump is not working, you need to perform a fuel pressure test to verify. 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.
What are the symptoms of low fuel pressure?
Low Fuel Pressure Symptoms & Causes 1 Unresponsive Throttle. All cars require proper fuel delivery to their cylinders in order… 2 Difficulty Starting the Car. Low fuel pressure will also make it hard for you to ignite your car’s… 3 Stalling Engine. If your car’s engine stalls while running, it is a clear sign you are having some…
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 happens if the fuel pressure regulator fails?
The fuel pressure regulator controls the fuel pressure in the fuel rail. If there is something wrong with the fuel pressure regulator, it can create too low or too high fuel pressure in the rail. It is not very common that this part fails, but it can happen.
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.
Can a poor fuel pressure regulator cause a Ford to stall?
A poor fuel pressure regulator can also cause your Ford to stall while idling or driving. While it will most likely occur while idling, it is not unheard of for the car to stall while you are driving down the road.
When to do a fuel pressure test on your car?
If your car is idling or running weird (high idle, low idle, hard to accelerate, studdering, hard to start) then this is one of the first tests you should do. Diagnose high fuel pressure, low fuel pressure, a broken check valve in the fuel pump, broken fuel pressure regulator, or leaking injectors.