W126 Engine cuts off

Discussion in 'Engine' started by design guru, Sep 10, 2011.

  1. design guru

    design guru Active Member

    Messages:
    436
    Joined:
    Feb 28, 2004
    Location:
    Hampshire
    Car:
    2001 W220 Mercedes S320cdi
    I have a W126 300 se 1991. I have recently had the car cut out on me whilst driving. It often occurs when I make a left turn, but it has happened whilst driving straight.

    I have read many articles that it could be possibly linked to the Fuel pump relay. Can anyone suggest any other places to look. The ignition leads, dis. cap and plugs were replaced less than 2 months ago. Where would I locate the fuel pump relay. I did find a relay coded 003 545 00 05, but looking on the net the relay for the w126 shows up as something different. this relay is located next to the fuse box just in front of the brake fluid container on an independent bracket. Is this the fuel pump relay? Is the code correct?

    Any advise on the matter would be greatly appreciated.
     
  2. grober

    grober MB Master

    Messages:
    27,891
    Joined:
    Jun 22, 2003
    Location:
    Perth, Scotland
    Car:
    W204 C200CDI Estate
    That number does refer to a fuel pump relay afaik. You could try taking it apart AND RESOLDERING THE CONNECTIONS ON THE SMALL INTERNAL PCB ---lots of posts about that on the forum. http://www.mbclub.co.uk/forums/favourites/93685-how-repair-resolder-relay.html Wouldn't worry too much about the FPR part no- there were lots of revisions over the years. If you go to your local MB dealer with your chassis no they will keep you right.
     
    1 person likes this.
  3. OP
    OP
    design guru

    design guru Active Member

    Messages:
    436
    Joined:
    Feb 28, 2004
    Location:
    Hampshire
    Car:
    2001 W220 Mercedes S320cdi
    Solved

    After reading about repairing the fuel pump relay I managed to open the fuel pump relay and touched up the main joints and what a result the car starts perfectly and every time you turn the key you can hear both pumps activate.

    I managed to loop a wire to override the relay and established both pumps were working and it was definitely a problem with the relay. Thank goodness for that as the pumps are quite expensive.

    Unfortunately I will not enjoy the benefits of trouble free driving as I've sold the car and just waiting for the buyer to collect.

    Thanks for the help
     
    2 people like this.
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