CX broken fuel pump
  • Register
  • Help
Results 1 to 11 of 11
  1. #1
    Member
    Join Date
    Sep 2013
    Location
    nz
    Posts
    69

    Default CX broken fuel pump

    Hi all

    went to start the series 1 CX 2400 Pallas. Wouldn't start. Turns over with heaps of spark but no fuel. Blew lines with air pressure, still nothing. Drained and removed tank. All fine. Blew line back other way. Pump not spitting any fuel out so must be at fault. Unless someone has any bright ideas?

    if it is the fuel pump, how hard is it to source and from where ?

    cheers

    Advertisement

  2. #2
    WRB
    WRB is offline
    Fellow Frogger!
    Join Date
    Sep 2012
    Location
    Burwood Vic
    Posts
    558

    Default

    CX Basis has them
    CX-BASIS :: eShop

  3. #3
    Fellow Frogger! Andy N's Avatar
    Join Date
    Nov 2004
    Location
    NSW
    Posts
    816

    Default

    Mine had an electric fuel pump fitted with a blanking plate where the mechanical pump sits. I transferred that to the 2400 engine I fitted and have no need for the mechanical pump. Can send it to you Monday/Tuesday you if it's not urgent. Let me know. Otherwise it's a part that should be readily available from a Citroen specialist at least second hand working....I can't see why one would fail though??

  4. #4
    1000+ Posts gerrypro's Avatar
    Join Date
    Nov 2010
    Location
    Camperdown 3260 Australia
    Posts
    3,020

    Default

    Quote Originally Posted by Andy N View Post
    I can't see why one would fail though??
    Either a faulty valve or a ruptured diaphragm!
    I assume that there are no splits in the supply line that cause the pump to draw air???
    Cheers Gerry

  5. #5
    Member
    Join Date
    Sep 2013
    Location
    nz
    Posts
    69

    Default

    No splits that I can see. I got a family member to cap the end before blowing air down it. It didn't seem to leak anywhere.

    i never knew they could fail.

    Thanks for the suggestions all and also on considering an electric pump. How hard are they to install, where is best and do you need to make a baking plate?

    Andrew. Thank you for the offer and I think I will take you up on it. I'm am in nz though.

  6. #6
    Too many posts! JohnW's Avatar
    Join Date
    Jul 2001
    Location
    Perth, WA, Australia
    Posts
    10,703

    Default

    They can seem fine but leak fuel back slowly. Mine needs a bit of cranking if it is not used for a week or two even with a near new pump.

    A non-return valve on the tank line would be good (why haven't I done this yet????).

    All mechanical pumps fail in the end.

    You must blank off the hole where the pump was.....

    Cheers
    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

  7. #7
    1000+ Posts gerrypro's Avatar
    Join Date
    Nov 2010
    Location
    Camperdown 3260 Australia
    Posts
    3,020

    Default

    Quote Originally Posted by JohnW View Post
    All mechanical pumps fail in the end.
    Cheers
    Murphy's Law of Mechanisms
    "if a mechanism can wear out --it eventually will"
    Cheers Gerry

  8. #8
    Fellow Frogger! Andy N's Avatar
    Join Date
    Nov 2004
    Location
    NSW
    Posts
    816

    Default

    Quote Originally Posted by benvv View Post
    No splits that I can see. I got a family member to cap the end before blowing air down it. It didn't seem to leak anywhere.

    i never knew they could fail.

    Thanks for the suggestions all and also on considering an electric pump. How hard are they to install, where is best and do you need to make a baking plate?

    Andrew. Thank you for the offer and I think I will take you up on it. I'm am in nz though.
    The after-market electric fuel pump was fitted in front of the tank where the filter is placed (and possibly blocked up).

    Power to the pump is linked to the fuel cut-off solenoid at the back of the carburettor so easy to hook up and then get a good earth on the chassis at the back where the pump is.

    The pump must be low pressure of course (not a fuel injection pump) and I don't have the specs for the Gates one handy but you can see details here: Citroen CX2000 Safari- express resto

    The blanking plate is a reasonably thick rectangle of steel with two holes drilled for the bolts......easy to do no matter what your experience, even I could do it

    I did see you were in NZ hence the heads up for postage, if I send early next week you may not get it until the following week. PM me your details if it's not urgent and I'll pop it in a pack and send it across the Tasman.

  9. #9
    Contented Peugeot Driver addo's Avatar
    Join Date
    Jun 2005
    Location
    Don't remind me!
    Posts
    16,609

    Default

    This general type of pump can have diaphragm ageing, where it is no longer taut and fails to create clear "pulses" to control the inlet and outlet poppet valves.

  10. #10
    Too many posts! JohnW's Avatar
    Join Date
    Jul 2001
    Location
    Perth, WA, Australia
    Posts
    10,703

    Default

    Quote Originally Posted by Andy N View Post
    The after-market electric fuel pump was fitted in front of the tank where the filter is placed (and possibly blocked up).

    Power to the pump is linked to the fuel cut-off solenoid at the back of the carburettor so easy to hook up and then get a good earth on the chassis at the back where the pump is.

    The pump must be low pressure of course (not a fuel injection pump) and I don't have the specs for the Gates one handy but you can see details here: Citroen CX2000 Safari- express resto

    The blanking plate is a reasonably thick rectangle of steel with two holes drilled for the bolts......easy to do no matter what your experience, even I could do it

    I did see you were in NZ hence the heads up for postage, if I send early next week you may not get it until the following week. PM me your details if it's not urgent and I'll pop it in a pack and send it across the Tasman.
    I've used Subaru pumps from the carburettor days with great success.
    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

  11. #11
    Member Houtan's Avatar
    Join Date
    Apr 2014
    Location
    Tehran, Iran
    Posts
    65

    Default

    You can use another Sofabex mechanical fuel pumps if you can`t find original CX fuel pumps, like Peugeot 405 and Renault 21 or 5 fuel pumps. But you must change size of spacer between Pump and engine block for Peugeot 405 fuel pumps because the head of those pumps is shorter than CX version, Also you can shave off head of Renault 21 fuel pumps to 4.5mm and use it with CX original spacer because head of R21 pumps are longer than CX versions. According to Service manual 818-1 head of fuel pump must be minimum 4.5 mm.

    Cheers.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •