CX fuel pump wiring
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Thread: CX fuel pump wiring

  1. #1
    Fellow Frogger! rmac's Avatar
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    Default CX fuel pump wiring

    Has anyone replaced the electrical cable to the fuel pump in a CX? Are there any hints/tips please?
    Cable to pump on my Familiale appears to have a break somewhere along the cable causing an intermittent fault.

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    Too many posts! JohnW's Avatar
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    Default

    No idea but, FWIW, I'd just run a parallel for a while to check whether that existing wire really is the intermittent source. Perhaps I'm lazy....

    Glad there's progress!

    Cheers
    JohnW

    Renault 4CV 1951
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  3. #3
    Fellow Frogger! rmac's Avatar
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    Quote Originally Posted by JohnW View Post
    No idea but, FWIW, I'd just run a parallel for a while to check whether that existing wire really is the intermittent source. Perhaps I'm lazy....

    Glad there's progress!

    Cheers
    We have only been able to start it with a parallel line so it seems to be the current culprit.
    Current Cars
    Australia's 2016 C5 2.0HDi Last
    2011 C5 2.0HDi Comfort
    1973 Citroen D Super 5,
    1981 Citroen CX 2400 Pallas C-matic,
    1981 Citroen CX 2400ie Super Familiale C-matic - Raid Arctique 2014
    1991 Mazda E2200
    1924 Citroen 'la petit citron'

  4. #4
    Too many posts! JohnW's Avatar
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    Hmm. Is there a flex point or does it have its own relay lurking somewhere I wonder? Still, running is RUNNING!
    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

  5. #5
    Fellow Frogger! andrewj's Avatar
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    Quote Originally Posted by JohnW View Post
    Hmm. Is there a flex point or does it have its own relay lurking somewhere I wonder? Still, running is RUNNING!
    Or a terminal / relay contact burnt and gone high resistance?

    Try measuring the voltage at the pump when trying to start- bypass wire vs existing wire. Is there excessive voltage drop on load on the existing wire, or just no volts = open circuit?

    Driving - '90 XM, '85 CX IE Auto, 406 Coupe, 405 srdt wagon, '78 dyane, Resting (or Rusting): '73 Birotor '82 CX Presitige, '81 CX Break IE, GS X2, GS1015 Wagon, GS 1300 5sp Wagon, '76 GS 1220 Wagon, '75 GS Wagon, '58 2CV, '58 Vauxhall Velox

  6. #6
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by rmac View Post
    so it seems to be the current culprit.
    Pun intended??????
    JohnW likes this.
    Cheers Gerry

  7. #7
    Tadpole
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    Hi, The fuel pump power is supplied through a relay of which (from memory) there are two versions,
    1. has a single set of make contacts which supply both the fuel pump and the high side of the injectors.
    2. has two sets of make contacts one set for the fuel pump and the second set for the injectors.
    These relays are common to a number of other Bosch Injection equipped vehicles and are often referred to as Big Blue because of their size and cover colour but I'm sure I've seen them back as well.

  8. #8
    Real cars have hydraulics DoubleChevron's Avatar
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    Yes, check the blue tachomatric relay ... Infact just pop its lid off and squeeze the contacts manually together. If the fuel pump runs, the wiring is fine. The usual culprit is the wiring connectors onto the tachometric relay as opposed to the relay itself.

    seeya,
    Shane L.
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    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


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  9. #9
    Fellow Frogger! rmac's Avatar
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    Thanks for all the tips. The blue tachomatric relay was working fine with power being run, via a separate cable, to test the fuel pump. As it was giving 12 volts at the relay but not at the pump the wiring has been replaced and we now have GO

    JohnW likes this.
    Current Cars
    Australia's 2016 C5 2.0HDi Last
    2011 C5 2.0HDi Comfort
    1973 Citroen D Super 5,
    1981 Citroen CX 2400 Pallas C-matic,
    1981 Citroen CX 2400ie Super Familiale C-matic - Raid Arctique 2014
    1991 Mazda E2200
    1924 Citroen 'la petit citron'

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