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W204 c200k takes to long to start

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Old Apr 2, 2016 | 02:34 PM
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riskamoto's Avatar
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mercedes c200 kompressor sport w204
W204 c200k takes to long to start

Late 2007 w204 c200 kompressor.
Takes 5 to 10 seconds cranking to start.
Never done it before, hasn't gradually got worse. Just started doing it. The car drives spot on once started. The battery is good. No fault codes from snap on solus. Had quality plugs 12 months ago.

Had a forte petrol treatment before doing a 130 mile trip when it started. I'm guessing it's fuel related. Maybe fuel is draining back.

I can hear the pump prime when turning ignition on. Pump is nice and quiet when running.

Once started the car will restart instantly unless it's left for more than 5 minutes. So hot or cold doesn't seem to make any difference.

My apologies if this question has been asked already. I couldn't find it, hence the thread. Any advice would be gratefully received.
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Old Apr 5, 2016 | 07:07 AM
  #2  
GLENN S.'s Avatar
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From: Cincinnati, Ohio
mb, saab, acura, dodge
Not sure about your model, but some fuel filters have the regulator built in. Does sound like fuel pressure loss. If you turn key on & off you might build enough pressure to get it to start quicker.
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Old Apr 19, 2016 | 09:11 PM
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Mark E. T.'s Avatar
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190e. 2.6
Originally Posted by riskamoto
Late 2007 w204 c200 kompressor.
Takes 5 to 10 seconds cranking to start.
Never done it before, hasn't gradually got worse. Just started doing it. The car drives spot on once started. The battery is good. No fault codes from snap on solus. Had quality plugs 12 months ago.

Had a forte petrol treatment before doing a 130 mile trip when it started. I'm guessing it's fuel related. Maybe fuel is draining back.

I can hear the pump prime when turning ignition on. Pump is nice and quiet when running.

Once started the car will restart instantly unless it's left for more than 5 minutes. So hot or cold doesn't seem to make any difference.

My apologies if this question has been asked already. I couldn't find it, hence the thread. Any advice would be gratefully received.
Fuel pump check valve,hold pressuse in the line ,unless it goes bad,then you have long crank times...eventho. you hear your pumps,valve on end of pump is bad.
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Old Apr 19, 2016 | 09:43 PM
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GLENN S.'s Avatar
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From: Cincinnati, Ohio
mb, saab, acura, dodge
Mark, I believe the check valve is incorporated in the filter/ regulator. Seen this issue many times on ML's. When the filter is full of crap, it shoots multiple misfire codes also. Maybe the C class has a different system?
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