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  1. #1
    Join Date
    Feb 2015
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    Default 2.4 Puma Fuel Rail Pressure

    What would cause the Fuel Rail Pressure to fluctuate at idle. It generally sits at between 2700 and 3200 psi but every now and then it will slowly increase to 12000 psi. When at the elevated pressure the idle will be a little erratic and the engine note changes with each step up in pressure.

    Touching the accelerator will immediately return the pressure to 3000 odd psi.

    I am reading the pressure on my Ultragauge.

  2. #2
    Join Date
    Feb 2012
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    Pretoria East
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    Default Re: 2.4 Puma Fuel Rail Pressure

    Have you opened and checked your MAF and MAP sensors?
    could be a dirty MAP possibly.
    Otherwise VCV or something that's little sticky.
    But checking and cleaning the sensors is an easy quick little job.
    Land Rover Defender 90
    Almost expedition ready...

  3. #3
    Join Date
    Feb 2015
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    Durban
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    Default Re: 2.4 Puma Fuel Rail Pressure

    Thanks . Have not cleaned them in a while so will start by checking and cleaning them.

  4. #4
    Join Date
    May 2009
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    Default Re: 2.4 Puma Fuel Rail Pressure

    first i would doubt the Ultragauge. see if you can somehow verify the reading - maybe with diagnostics.
    secondly fluctuation may be related to the condition of the high pressure fuel pump and the fuel temperature and the condition of the fuel filter. with a dirty fuel filter, the pump will battle to suck the diesel in and therefore battle to make consistent pressure.
    generally mechanical pumps have some fluctuation at idle and as the revs increase, the pump seems to stabilise
    this is so typical of (no pun intended) someone who has acquired a toy and now all of a sudden you are becoming aware of what is happening under the bonnet
    typically cars are fitted with a oil pressure switch and oil light
    all is ok in your mind till the light comes on
    once the light comes on (typically if the oil pressure dips below 0.5bar) you become aware that the car actually has oil pressure (again no pun intended). most people never even think about oil pressure. they turn a key and it starts and they drive.
    most drivers are concerned about the speedo and the fuel gauge and as long as the engine sounds ok, they are content.
    Last edited by Landyluvver; 2016/08/27 at 06:59 PM.

    Land Rovers never die, they simply become organ donors!

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