Let’s look at the top fuel problems and how you can troubleshoot some of them. Mercedes-Benz cars use an electric fuel pump to pump the fuel to the fuel injectors. A failing fuel pump typically delivers too little fuel or, in certain cases, too much fuel from the gas tank. Under normal operation conditions, the fuel pump provides a constant fuel flow. Typically problems related to the fuel pump and fuel pressure include: Troubleshooting Mercedes Fuel Pump ProblemsĪ bad fuel pump can cause the engine no start condition or poor performance. *Note that under normal operation, the fuel pressure should build up as soon as you turn on the ignition before you even crank the engine. With vacuum hose disconnected: 54 – 61 PSI.You will notice that the fuel pressure didn’t change much when RPMs were kept constant at 4000, 2000, and idle, which is a good sign. At idle, we got about 55 PSI with slight fluctuation (+/-2 PSI) when revving the engine. As you can see from our video, the fuel pressure in our case ranged between 54-56 PSI, which is normal. Try starting the motor and get a fuel pressure reading. If you turn the ignition ON, the fuel pressure should build up before you even crank the engine. If you have difficulty finding the fuel pressure port (Schrader valve) on your Mercedes, start from one of the fuel injectors and follow the fuel rail. Locate the fuel test port on the fuel rail. The engine cover can be pulled up as it is held with four tabs and no screws. Never carry this test if the engine is hot. Keep a fire extinguisher nearby in case of emergency. If fuel falls on hot engine parts, you may cause a fire. 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.īe extremely careful during this test procedure. The Actron CP7818 fuel tester works on most Mercedes-Benz and has the required Schrader valve required for MB cars. For this test, you will need a fuel pressure gauge. A fuel pressure check on your Mercedes-Benz will tell you whether the fuel pressure is within range. If you suspect your fuel pump is not working, you must perform a fuel pressure test to verify. If you need help diagnosing fuel problems on a diesel engine, check out this tutorial. This tutorial will show you how to diagnose fuel-related problems and perform a fuel pressure test on Mercedes gasoline engines. While fuel pump failure isn’t very common in MB cars, we have seen several Mercedes cars such as M元20, C-Class, and E-Class models have a fuel pump go bad as early as 120k miles. It pumps the gasoline from the fuel tank to the engine. The fuel pump is located in the fuel tank. The fuel pump plays a vital role in Mercedes-Benz cars.
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