OVP Relay Fuse

Discussion in 'Electronics' started by sinky, Oct 5, 2011.

  1. sinky

    sinky Hardcore MB Enthusiast

    Messages:
    153
    Joined:
    Apr 14, 2010
    Location:
    Costa del sol
    Car:
    Mercedes 200 ce 1994
    Hi Iv just bought a 1994 200ce that has been standing for 4+ years.
    It wont start but its nearly there.
    I think the fuel pump has chucked it but reading some archive threads I thought I would check the some relays.
    The 10amp fuse had blown on the OVP relay so I replaced and still no start.

    Why would it be blown do you think?
    Also the relay next to it the size of a fag pkt would that be my fuel pump relay?

    I cant hear the FP kicking in so thats what makes me think its chucked it.

    Any clues guys and gals.

    Thanks Sinky
     
  2. GP801

    GP801 Hardcore MB Enthusiast

    Messages:
    2,881
    Joined:
    Jun 18, 2010
    Location:
    Sussex and Tuscany
    Car:
    2003 W209 CLK, 2005 R171 SLK in UK, 1995 S124 E280 in Italy
    Fuel pump relay and OVP relay both need to work properly for the fuel pump to run. They can be repaired but we had to replace both on our 124. OVP approx £80 Fuel pump relay about £30-40. Genuine MB new parts. You could test the fuel pump by connecting it to a 12v supply directly. Not sure on the 200 but our 280 has 2 fuel pumps.
     
    1 person likes this.
  3. Druk

    Druk Administrator Staff Member

    Messages:
    5,309
    Joined:
    May 28, 2004
    Location:
    Not far from Edinburgh.
    Car:
    2011 S212 E350CDi. 1981 R107 300TurboDiesel.
    The FPR should have 'Kickdown' written on it (perversely). If you bridge pins 30 and 87, re-insert the relay, then switch the ignition on the pump should run continuously. This will do no harm but will test if the relay is duff or not.
     
    1 person likes this.
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