Gas Tank Filler & Check Engine Light & Gas Cap Light

Discussion in 'LR4' started by dngvt, Jul 18, 2017.

  1. dngvt

    dngvt Member

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    So I have this problem with my 2103 LR4. From time to time my gas tank will not fill properly, and it will cut off as if full when it is barely filled. At the same time, the check engine light goes on and off from time to time, and sometimes the gas cap is loose light comes on too. Whenever it does I check the cap and it is perfectly attached and tight. sometimes the gas gauge jumps around at the same time, sometimes it doesn't.

    Then these issues go away for a while. And then return in some odd combination or sequence, but always with the gas tank not filling correctly.

    So what is this? I've tried searching for this issue and can't find anything.
     
  2. cperez

    cperez Full Access Member

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    Just yesterday I was reading some forum posts about skid plates, and how a damaged gas tank resulted in an LR4 with a max range of 150 miles. This would not necessarily explain all of the symptoms you mentioned, but is there a chance you have some damage to the bottom of your tank that might have jacked up the baffles, or tweaked the sensors in some way?
     
  3. dngvt

    dngvt Member

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    Cperez,

    Thanks for the idea. It was looked at and the bottom is all fine with no impact damage anywhere. I think the issue is somewhere in the filler neck, or the sensors that control the cutoff but have no idea how to go about assessing that.
     
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  4. Kenneth Kahan

    Kenneth Kahan Member

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    A faulty DMTL pump will cause the light and message. This an emissions device that looks for leaks but only under certain conditions which is why yours goes on intermittently. It will not check if the tank is more than say 3/4 full. It will check only after the vehicle is shut down after being run for a prescribed time. And the cycle has to be run a number of times before it will turn on or turn off to indicate things are ok. None of this though has a connection that I know of to the filler problem, however I would check the filler vent that is probably connected to the DMTL system for obstruction. If air can't get out of the tank then gas can't get in.
     
  5. abmty1

    abmty1 New Member

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    I had the same symptoms with my 2011. I purchased it used with a Land Rover service history. Previous owner reported same symptoms. Land Rovers corrections said it was a loose DMTL pump and could not duplicate it when they fueled it up.
    Mine eventually thew a code, I believe it was PO442 but it relates to a small evap leak. A sucking sound developed from the gas cap when driving and at idle. It became more frequent so I decided disconnect all of the evap lines and blow a very low psi of air maybe 5 psi through the lines. I could not find a blockage. I decided to change the DMTL pump and purge valve. No luck. I really felt a blockage was somewhere so I took the evap system apart again but this time I blew a high psi of air, 25 psi if I recall directly into the charcoal canister for 10 minutes off and on while shaking it. It was still in its carrier but bolts removed. The light and suction from gas cap both went away. It has been about a year. I would guess the the previous owner was topping off the tank and the overfill line was directing the excess gas to the canister and caking the charcoal. Just my guess. Beats replacing the filler neck that 2 mechanics hypothesized. I hope my process, though it may be flawed helps someone as I could find nothing when I search how to fix the suction happening.
     
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  6. ReconPFDR

    ReconPFDR New Member

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    I just bought a 2011 Rover Sport. When I went to fill it up two days later, same problem: 1/2 to 1 gallon at a time. I tried all possible positions and angles from which to hold the pump.
    Is there any media out there on the line clearing/ charcoal canister clearing specific to rovers? This is my first Range Rover and while I’ve done a fair amount of work on TJ Jeeps, I don’t really know much about this.
    Thanks!
     
  7. avslash

    avslash Active Member

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    I have had my 2012 LR4 since new.

    It has sporadically exhibited similar symptoms. It will randomly throw a "small evap leak" code, or "check gas cap" code on the order of once every 3 or four months. Dealer replaced the gas cap under warranty, but was never able to replicate any other faults.

    I just clear it with the IID tool, and drive on.

    My truck did develop a crack in the sealing ring on top of the fuel tank that required replacement. That might be worth checking for you.
     
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  8. ReconPFDR

    ReconPFDR New Member

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    avslash- thanks for the feedback and ideas.
     

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