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Ideas on cold running issue

  • 25-10-2014 9:47am
    #1
    Packrat
    Registered Users, Registered Users 2 Posts: 1,403 ✭✭✭


    Morning all,
    As I'm sitting here waiting for the guys in WTS to finish a window tint on a commercial conversion I'm currently doing, I thought I'd pick the collective brains here on an issue with the engine in a car I'm currently trying to get shut of.
    So: it's a 5 cylinder td which will start but runs out of diesel and cuts out after 5 min when cold. There is a compression ball on the fuel line to the filter and if pumped up again, it will restart and run for another 5 min again. If I can get it warm, it runs fine.
    Weak fuel pump? If so, why is the problem not evident when it's warm?

    Ideas?

    “The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command”



Comments

  • #2
    visual
    Closed Accounts Posts: 3,267 ✭✭✭visual


    Cold diesel is thicker than when warm and pump has to work harder.
    Check for leaks first as air can also get sucked in and make it harder for pump.
    What make model is it ?


  • #3
    Packrat
    Registered Users, Registered Users 2 Posts: 1,403 ✭✭✭Packrat


    visual wrote: »
    Cold diesel is thicker than when warm and pump has to work harder.
    Check for leaks first as air can also get sucked in and make it harder for pump.
    What make model is it ?

    it's a rexton 2.7 dti. :o and yes, I know they are utter dirt.

    They have a "merc" engine ie merc sold them the plans for the old ML engine and it's build from sh1tty Korean parts.

    This thing doesn't warrant a new pump, so I just want it to run well enough to get through the auction. Annoying thing is that when warmed up it runs like a mouse's heart and drives very well.

    “The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command”



  • #4
    visual
    Closed Accounts Posts: 3,267 ✭✭✭visual


    If its the same or similar used in sprinter van and jeep grand cherokee then its the high pressure pump. There is no low pressure pump in tank.

    When not used for a while the seals in pump let in a small amount of air. The pump isn't able to work efficient and create a vacuum to suck fuel from tank and compress it to supply injectors After many attempts to start the pump will over come the air and start pumping fuel.

    Not done this myself but the best cure is to replace all the seals in pump. Think there is 3 but dont hold me to that.
    The rubber perishes over time common fault on the 2.7 crd Mercedes engine and its clones


  • #5
    Packrat
    Registered Users, Registered Users 2 Posts: 1,403 ✭✭✭Packrat


    visual wrote: »
    If its the same or similar used in sprinter van and jeep grand cherokee then its the high pressure pump. There is no low pressure pump in tank.

    When not used for a while the seals in pump let in a small amount of air. The pump isn't able to work efficient and create a vacuum to suck fuel from tank and compress it to supply injectors After many attempts to start the pump will over come the air and start pumping fuel.

    Not done this myself but the best cure is to replace all the seals in pump. Think there is 3 but dont hold me to that.
    The rubber perishes over time common fault on the 2.7 crd Mercedes engine and its clones

    I heard one guy suggest fitting a simple in line pump in to assist?

    Sounds nuts but might be cheaper than messing with the high pressure pump?

    “The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command”



  • #6
    visual
    Closed Accounts Posts: 3,267 ✭✭✭visual


    Packrat wrote: »
    I heard one guy suggest fitting a simple in line pump in to assist?

    Sounds nuts but might be cheaper than messing with the high pressure pump?

    Short term it will but problem will return.
    The seals aren't expensive if you can find someone at reasonable price to fit them


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