[W126 Coupe] Fuel pomp problem?

[Slawomir Dejneka]

Thanks for your answer. I think I hato go to the service. I don't want make something worse then it is now.

Slawek
  ----- Original Message ----- 
  From: Mister McGoo 
  To: mbcoupes at mbcoupes.com 
  Sent: Tuesday, February 08, 2005 7:21 PM
  Subject: RE: [W126 Coupe] Fuel pomp problem?


  Slawek;

  Two possibilities come to mind:

  1. If the car is particularly hard to start first thing in the morning when the engine is completely cold, the cold start sensor or cold start injector may not be working.  When cold, an extra shot of fuel is injected into the intake manifold through a "nineth" injector located on the top of your manifold.  It should only function when the engine is completely cold.  Check whether these components are functioning.

  2. If the car seems to start better (but not great) first thing in the morning, but is worse after cooling down for 20 minutes, then its possible that the injector seals are leaking.  There are also two check valves one at the injector pump and the other at the fuel pump, that could be leaking pressure back. The cold start injector would not operate after just 20 minutes because the engine would still be warm.

  Just a couple of guesses maybe worth looking at.

  -Bellamy 



  >From: "Slawomir Dejneka" <sdejneka at poczta.fm> 
  >Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com> 
  >To: "mbcoupes" <mbcoupes at mbcoupes.com> 
  >Subject: [W126 Coupe] Fuel pomp problem? 
  >Date: Sat, 18 Dec 2004 13:48:47 +0100 
  > 
  >Hi All, 
  >I have a problem with the engine when the engine is cold (after night) or when is warm and left about 20 minutes  I can't start engine at first time. I'm turning key on and I'm waiting about 5 sec. before I'm starting the engine. Sometimes it start sometimes not. But when is cold is not working evenly. 
  >I think the problem is with fuel pomp because it should pump some fuel to the engine to fashion pressure. Sparks are new NGK. 
  >What do you think? 
  > 
  >Regards, 
  >Slawek 
  >86' 500SEC 
  >The MB Coupes Website! 
  >W126 SEC Mailing List 
  >Postings remain property of MB Coupes, L.L.C. 


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