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Thread: Diesel Lift Pump faulty. MK3 Mondeo

  1. #1

    Unhappy Diesel Lift Pump faulty. MK3 Mondeo

    I have a MK3 Mondeo 2002 TDDI. The car suddenly died on approach to the lights. The recovery man came and concluded it was the diesel lift pump. After a few knocks the engine restarted and I made my way home accompanied by the recovery breakdown van.

    The following morning I travelled about 20 miles and the car died again. This time the car failed to start aftert a number of gentle knocks. I was towed home and the fault diagnosed as the lift pump.The lift pump has now been replaced but the car will still not start. I have noted that there is no power showing at the pump's electrical connections. Is this a relay problem or something else. Your thoughts welcomed.
    Thanks

  2. #2
    Join Date
    Nov 2010
    Location
    Bewdley, Worcs
    Posts
    122

    Default

    Try twiddling with the connector plug on the fuel rail pressure sensor.

    A common fault on this year, if the pressure sensor signal is lost then the fuel pump relay will not send power to the pre supply pump.

    Cure: Replace the old tin type connectors with Gold type and apply a small amount of silicone grease.


    Lloyd

  3. #3
    Join Date
    May 2008
    Posts
    10,543

    Default

    Check the inertia switch behind the left hand kick panel.

    The lift pump relay is no.4 in the fuse box under the bonnet.

    Check the following fuses in the same box:-

    Fuse 9 - 20amp
    fuse 23 - 15amp
    fuse 27 - 15amp
    fuse 30 - 7.5amp
    fuse 32 - 3amp
    fuse 33 - 3amp
    fuse 40 - 7.5amp
    fuse 42 - 15amp

    The layout may be marked on the underside of the fusebox cover.or refer to the manual.

  4. #4

    Default

    Quote Originally Posted by Techiloyd View Post
    Try twiddling with the connector plug on the fuel rail pressure sensor.

    A common fault on this year, if the pressure sensor signal is lost then the fuel pump relay will not send power to the pre supply pump.

    Cure: Replace the old tin type connectors with Gold type and apply a small amount of silicone grease.


    Lloyd
    Thanks

    Where is the fuel rail presuure sensor located?

  5. #5
    Join Date
    Nov 2010
    Location
    Bewdley, Worcs
    Posts
    122

    Default

    Look at where the Red arrow is pointing on the photo in this link:

    http://www.google.co.uk/imgres?imgur...w=1345&bih=562

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