[W126 Coupe] Battery Drain

[Vance Rowley]

Hi Dawid,

 I must admit, I would have thought that it would require ignition switch on for the fuel pumps to become live, but I have seen others on this list mention about them firing up while the car is stood and off. I will see if I can find my diagram and take a look. Will report back with any findings.

Vance
  ----- Original Message ----- 
  From: Dawid Loubser 
  To: Vance Rowley ; Mercedes Coupes Mailing Lists 
  Sent: Thursday, April 26, 2007 9:46 AM
  Subject: Re: [W126 Coupe] Battery Drain


  Vance,


  Will the fuel pumps run to build pressure even if the car is switched off?
  I though they activated only upon ignition turned to position 2. (i.e. I can hear
  them kicking in)


  Dawid




  On 26 Apr 2007, at 3:09 vm., Vance Rowley wrote:


    Hi Clay,

     The only connection I can make between your fuel filter change and the battery drain is that maybe the filter was not put in correctly and there is now a small leak which in turn the fuel pressure is dropping and the fuel pumps are firing up to compensate, thus draining the battery.

    Good luck,

    Vance
      ----- Original Message ----- 
      From: benzman3 
      To: SEC CLUB 
      Sent: Wednesday, April 25, 2007 5:35 PM
      Subject: [W126 Coupe] Battery Drain


      Hi Guys, I hope someone can steer me in the right direction one this new problem. I took the car in for a fuel filter change and my mechanic said that the fuel pump or pumps where getting a little noisy. I drive can to airport and son drives car home and puts in garage. I get back 6 days later, car is dead. so I charged it and when I try to start I had to hold pedal to floor and car stumbled and missed. Took for ride and didn't change. Mechanic said change battery. I put in brand new yesterday, along with a new set of plugs. Car almost start on first click, but then same thing had to hold to floor, barly idles, but rev's fine. Went out this morning to take in and it's dead again.
      Could mechanic done something when changing filter. Need help big time ?
      Regards, Clay Moizo
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