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Pelican Technical Article:

Purge Valve Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

Flathead screwdriver

Applicable Models:

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

Parts Required:

Valve, hose clamps

Hot Tip:

Make sure you install it in the right direction

Performance Gain:

Pass SMOG test

Complementary Modification:

Change air filters

A faulty purge valve or regeneration valve for fuel vapor recovery can cause you to fail a SMOG test and throw an error code in the system. The purge valve opens to allow all the vapors that are captured from the fuel tank (especially during fill ups) to be recycled to the engine to be burnt once the engine has reached certain performance parameters. There are two lines attached to the valve. Even though it is very difficult to mix them up, as they are different sizes, pay attention and make sure you install the valve in the right direction. The line out from the valve to the connection by the throttle body is indicated by an arrow.

You are going to destroy the factory clamps when you replace the valve so make sure you order replacement hose clamps when ordering the valve.

The purge valve is located under the left side air intake (red arrow).
Figure 1

The purge valve is located under the left side air intake (red arrow).

Remove the intake by compressing it back off the air filter cover (red arrow) and then sliding it off the plastic duct on the front trim piece (yellow arrow).
Figure 2

Remove the intake by compressing it back off the air filter cover (red arrow) and then sliding it off the plastic duct on the front trim piece (yellow arrow).

With the duct removed you can see the purge valve (red arrow).
Figure 3

With the duct removed you can see the purge valve (red arrow). The rubber grommet that is part of the valve sits in a metal bracket.

Lift the valve up and off the metal bracket the rubber grommet sits in (red arrow).
Figure 4

Lift the valve up and off the metal bracket the rubber grommet sits in (red arrow). Next press in the clip on the electrical connection and separate the wiring connection from the valve (yellow arrow).

The factory uses a special type of clamp that you will need to pry apart with a small flathead screwdriver (red arrows).
Figure 5

The factory uses a special type of clamp that you will need to pry apart with a small flathead screwdriver (red arrows). If you are really careful you may be able to re-crimp these clamps but have two extra hose clamps on hand to be safe. Use care when prying these apart so that you don't damage the hoses.

Though it is almost impossible to install the valve incorrectly make sure the MOT line out to the throttle body is connected to the right hose (red arrow).
Figure 6

Though it is almost impossible to install the valve incorrectly make sure the MOT line out to the throttle body is connected to the right hose (red arrow). Installation is the reverse of removal.


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Comments and Suggestions:
iwinandrew Comments: Hi Steve,
I am trying to replace the Purge valve on my GL450 2007.
Reason being P0455 code.
I was able to disconnect the electric harness.
I am having trouble disconnecting the in and out tubing off the valve.
Kindly help.
Thanks
November 24, 2016
  Followup from the Pelican Staff: The left fitting, press and hold the black rectangle at bottom and pull off.

Lower hose, cut and replace clamps. - Nick at Pelican Parts
 

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