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Fuel Pressure Sensor Replacement
 
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Pelican Technical Article:

Fuel Pressure Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$60

Talent:

**

Tools:

8mm socket

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Fuel pressure sensor

Hot Tip:

Be careful working around gas

Performance Gain:

Better running engine

Complementary Modification:

Replace fuel filter

A faulty fuel pressure sensor can cause poor engine performance and hard starting problems. When they fail completely, you may be left with an engine that doesn't run at all. If you are getting an error code for the pressure sensor make sure to replace it right away.

The fuel pressure sensor sits in the lid of the fuel filter under the left rear seat in the 2008 C350 and is VIN specific. There are several different types of filters and pumps for the W204 family so make sure to have your VIN handy when ordering. While you do not need to remove the filter from the gas tank when replacing the sensor you will still be opening a small access hole to the tank when you remove it so take all the precautions necessary when working with gas.

You are going to be working around gas so wear proper clothing, gloves and safety glasses when working with gas. When replacing, work in a well-ventilated area, working outdoors is a good choice. Do not use incandescent work lights or power tools, and DO NOT smoke. Fuel and fuel vapors are highly combustible.

Begin by opening the fuel filler door and removing the gas cap.
Figure 1

Begin by opening the fuel filler door and removing the gas cap. This will help relieve pressure in the system.

You will need to remove the rear bench seat to access the sensor so please see our article on seat removal for additional assistance.
Figure 2

You will need to remove the rear bench seat to access the sensor so please see our article on seat removal for additional assistance.

After you have removed the rear bench seat and padding you will see the access cover for the filter and sensor under the rear left seat.
Figure 3

After you have removed the rear bench seat and padding you will see the access cover for the filter and sensor under the rear left seat. Use a 8mm socket and remove the four bolts (red arrows). Lift the cover off and peel back the sealant around the wiring pass through.

The fuel pressure sensor is located in the lid of the fuel filter and can be replaced without removing the retaining ring or pump (red arrow).
Figure 4

The fuel pressure sensor is located in the lid of the fuel filter and can be replaced without removing the retaining ring or pump (red arrow).

Disconnect the electrical connection from the sensor (red arrow).
Figure 5

Disconnect the electrical connection from the sensor (red arrow).

The sensor is held in the lid by a metal clip (red arrow).
Figure 6

The sensor is held in the lid by a metal clip (red arrow). Hand pressure should be sufficient to pull the clip back out from the lid.

Carefully clean around the sensor and lid and then pull the sensor straight up and out from the lid.
Figure 7

Carefully clean around the sensor and lid and then pull the sensor straight up and out from the lid. There will be a small O-ring that seals the sensor to the lid. Place a small amount of clean gas on this O-ring when reinstalling. Installation is the reverse of removal.

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Page last updated: Wed 12/7/2016 02:58:32 AM