S350 (2003) Dodgy Fuel Gauge

Discussion in 'Electronics' started by Jokuk, Apr 30, 2014.

  1. Jokuk

    Jokuk Hardcore MB Enthusiast

    Messages:
    158
    Joined:
    Apr 29, 2014
    Location:
    Buckinghamshire
    Car:
    S Class 350 2003 (W220)
    Hi all,

    S Class 350 2003 W220

    New owner and member here, I have spent the last few days reading nearly all of the threads which have been very useful but have a few problems that don't seem covered.

    I am going to post them individually hopefully in the right areas to see if anyone can help, please excuse any basic errors.

    When I start the car the petrol gauge moves to the correct position but after driving for say 30 minutes it suddenly drops to empty (no warning light illuminated)

    The first time it happened I really thought it was Low so put some petrol in but £10 took it up to half full (needle had previously been on the 1/4 mark approx)

    the next time I knew it was around half full when it suddenly went to empty, switching the ignition off and restarting didnt help.

    Do you think it's a sticky sender unit/float

    not sure what is in the tank as last one I ever played with was a TR6 which was simple to work on?

    Thanks in anticipation

    John
     
  2. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,315
    Joined:
    Feb 8, 2007
    Location:
    Horndean, Portsmouth, Hampshire, Southsea
    Car:
    C43 AMG with a 55 engine and supercharger, MK1 Caddy, S500, etc
    I expect it will be a fault with the cluster itself. They can be repaired. Google Cartronix.

    To prove it. Use a strong dose of injector cleaner firstly. This often cleans the sender 9/10. If that doesn't sort it then send the cluster to Cartronix for them to check it.
     
    1 person likes this.
  3. OP
    OP
    Jokuk

    Jokuk Hardcore MB Enthusiast

    Messages:
    158
    Joined:
    Apr 29, 2014
    Location:
    Buckinghamshire
    Car:
    S Class 350 2003 (W220)
    Update - Started car, gauge on zero. Put £10 of decent petrol and some cleaner in, gauge moved to 1/2 full immediately, so far so good but only done a 20 mile run. Perhaps it runs on LPG too much?
     

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