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Mercedes-Benz of Stevens Creek

Mercedes-Benz C 240 Acceleration Problems - How To Troubleshoot and Fix

Your Mercedes-Benz C 240's acceleration is powered by an exhaustive list of mechanical and electrical parts, such as throttle position sensors for fuel/air mixture optimization, mass airflow, and fuel injectors, and fuel pumps. All of these mechanisms are designed to regulate fuel to match your desired speed.

Let's discuss common problems that could cause your Mercedes-Benz C 240's acceleration to stall. Keep reading below to learn common Mercedes-Benz acceleration problems, how to troubleshoot to find the problem, and solutions to common acceleration problems.

Common Symptoms That Cause Acceleration Problems In Your Mercedes-Benz C 240

Defective Fuel Pump


One potential reason for Mercedes-Benz C 240 acceleration issues is a defective fuel pump. Fuel pumps are responsible for feeding fuel to your engine, which pumps with more or less force depending on your desired speed. Watch for defective fuel pumps by checking for whirring noises coming from your fuel tank, a check engine light coming on, or unexpected stalling and failure to start.


Replacing a fuel pump requires raising your vehicle using a floor jack, drainage, disconnecting battery cables/fuel hoses/emissions hoses, and aligning a new replacement fuel pump to the assembly. Your service manual can provide additional instructions on how to remove the fuel pump assembly.

**This process increases exposure to highly flammable vapors, which can spark into a fire if not treated properly.**

New pumps can be installed in the reverse order of the steps used to remove your old pump. Get The Mercedes-Benz Fuel Pump You Need Here.

Leaking Transmission Fluid


Another sign of an acceleration issue is leaking transmission fluid. Transmission fluid works as a coolant and power transmitter, helping ensure all of your engine parts are properly lubricated so they can work correctly. This includes your engine, which works to transfer power to your wheels. Think of it as the oil that lubricates the chains on a bicycle to keep it moving. One of the most common culprits of leaking transmission fluid is a perforated pan or a loose drain plug.

Replacing your Mercedes-Benz C 240's transmission fluid is a very straightforward process. Here's how to accurately troubleshoot and get your vehicle up and running again in no time. 


  1. Lift your Mercedes-Benz C 240 off of the ground using a car floor jack.
  2. Catch old oil by affixing a container under your transmission oil pan and loosen the pan bolts for draining.
  3. Add a new transmission pan gasket and filter, ensuring all old grommets are removed.
  4. Tighten the transmission pan bolts and ensure the pan is completely sealed. This is very important.
  5. Use a transmission fluid dipstick to measure levels and funnel in new transmission fluid.
  6. Perform a quick test drive to check for the previous acceleration issues. Watch for stalling and hesitation, especially when climbing uphill.

This process should take no more than 30 minutes. Note, this step requires lifting your Mercedes-Benz C 240 off the ground using a floor jack. If you are uncomfortable performing this step on your own, please consult your local Mercedes-Benz technician/dealership.

Leaking Fuel Tank


Fuel tanks with heavy wear and tear are prone to fail, resulting in fuel leakage. This could create a fire if you aren't careful. Fuel Tank leakage is especially true in areas with tons of snow and salt as salt does not dissolve in gasoline and will corrode to the bottom of your tank. This corrosion can make its way into your engine with the fuel as it flows through. This can damage your engine greatly. This can also cause your fuel tank or fuel line to leak and is a call to have it replaced or repaired.


We recommend taking your Mercedes-Benz into a certified technician or Mercedes-Benz Dealership to have your fuel link and fuel tank inspected to see exactly what will need to be replaced. Sometimes the tank or line can be repaired easily by the mechanic, other times the whole tank will need to be replaced if there is enough damage. Get A New Mercedes-Benz Fuel Tank You Need Here.

All in all, there are many parts and components that could result in sluggish or stopped acceleration on your Mercedes-Benz C 240. For Mercedes-Benz C 240 acceleration problems, there are many steps you can take to troubleshoot and fix the problems on your own.

If the repair cannot be performed on your own or if the issue is too great, we recommend taking this into your local certified Mercedes-Benz technician/dealership. If you are in need of any replacement parts you can get them here on the Mercedes-Benz National Store.