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vw caddy not starting

  • 15-01-2012 7:05pm
    #1
    rs8
    Registered Users, Registered Users 2 Posts: 446 ✭✭


    97 vw caddy not starting (1y engine) theres no fuel goin to the pump so i norrowed it down to either the big ecu relay or the tank unit!! got a relay off a friend today and no joy so would i be right in saying its the tank unit?? there diesel in it and before this it was taking about 3 atempts to start!!

    any advice welcome


Comments

  • #2
    101sean
    Registered Users, Registered Users 2 Posts: 2,884 ✭✭✭101sean


    Moved from 4x4, tractors, diggers and plant, more likely to get an answer here.


  • #3
    couldntthink
    Registered Users, Registered Users 2 Posts: 295 ✭✭couldntthink


    what is it that leads you to think it's the ecu relay or the "tank unit". More info required.


  • #4
    Slidey
    Closed Accounts Posts: 12,811 ✭✭✭✭Slidey


    It could be any number of things but going by the age of it I would say the only likely electrical fault that would cause a non-start would be a stop solenoid on the pump.

    Have you changed the fuel filter?

    Checked all the fuel lines for leaks/cracks back to the tank?

    I did see the tank unit blocked with shyte on a Golf, you could get at it under the passenger seat, not sure if there is an inspection plate on the floor in the Caddy.


  • #5
    swhyte027
    Closed Accounts Posts: 419 ✭✭swhyte027


    I would be more likely to say the fuel pump but the info u give isn't great but I'd be going with the fuel pump on it.as its mechanical pump


  • #6
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,679 ✭✭✭✭CJhaughey


    Try testing relay 109, these are a known problem on the Seat Inca/VW caddy, these cause starting problems. Its a dealer only part but not too expensive.


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  • #7
    rs8
    Registered Users, Registered Users 2 Posts: 446 ✭✭rs8


    sorry lads havent been on i a while!

    yes fuel filter was change recently!

    i think it could possibly be the relay or the tank unit cause theres no diesel getting to the injector pump! the big relay controls the tank unit pump but as i say i got one handy off a friend and it didnt work! so this is why i think its the tank unit!


    slidey theres three solenoids on the pump! i tried sending power to all three (not at same time) to see if it would do anything, any tips about these?? ill check the pipes when i get a chance

    no such thing as a relay 109 in a 1y engine


  • #8
    Slidey
    Closed Accounts Posts: 12,811 ✭✭✭✭Slidey


    Just to confirm, this is a 97?

    I don't think there is any pump in the tank unit of a 97 caddy, the lift pump is built into the injector pump. Someone want to correct me on this?

    If you just hook up a clean gallon can of diesel to the injector pump and see will it fire.

    The stop solenoid is a 24mm jobbie with a single wire to the top of it. If is not taking a current it may well be faulty. You can remove the solenoid and take out the plunger and spring to get around the issue temporarily


  • #9
    rickyweaver22
    Closed Accounts Posts: 3 ✭rickyweaver22


    Have u replaced the fuel pump relay switch and glowplug relay switch? My van cuts out randomly and wont start randomly I fort it maybe the glowplugs wer worn but changed em for ngks still no joy but she fires up wen she wants to very tempromental, if u have found the problem take the time and write back on here m8 could do with some caddy help cheers mate!


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