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Thread: Sub Tank emptying by inself.

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    Sub Tank emptying by inself.

    Hello all.
    I have a 2003 intercooled 4.2 DX ute.
    I have an issue whereby after filling both tanks, the main tank starts to be use, but by 1/2 tank the sub-tank starts to empty into the main tank. This happens without the pump being turned on. I can only assume that it is siphoning through. It was about 25 liters this last fill up. Has anybody else had this problem?

    Regards

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    Legendary happygu's Avatar
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    The Sub Tank Pump will turn on for about 10 seconds every time you turn the key to start your truck, to make sure everything is in working order for when you need it.

    If you are doing a fair bit of key stop / start, then that would explain it.

    For normal type driving though, it should only empty the top few litres out of the sub tank.
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    Patrol God nissannewby's Avatar
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    The sub tank controller does this at every start. It will pump fuel from the sub to the main as apart of the startup checks. So if you are starting a lot then it will show on the gauge. I sometimes use to nearly have a quarter transferred over multiple start ups.

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    I am he, fear me the evil twin's Avatar
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    It is supposed to do that.

    If there is fuel in the Sub and the main is less than 3/4 full, every time you start the car the Sub Tank Computer will pump a litre or so of fuel as part of it's self test.

    Its just a 'Patrol Thing"
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    Patrol God nissannewby's Avatar
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    We must have all been typing at the same time....

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    PeeBee (12th May 2018)

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    I am he, fear me the evil twin's Avatar
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    Yep... I'm in Onslow today so it took an extra minute to get those bytes an extra 5000 K's over east
    Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.

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    DX grunt (13th May 2018), MudRunnerTD (13th May 2018)

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    Thank everyone for your reply's. This is good to hear. I had visions of having to go and strip out and clean pumps and stuff.

    Regards
    Gavin

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    Moderator MudRunnerTD's Avatar
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    When you take off your fuel cap to the main tank is there Vacuum behind the cap? I had this issue when i was travelling the Outback. I had fitted a Long range tank and had mixed the breathers up. Make sure your tank breather is working as mine appeared to create enough vacuum to suck out of the sub. My sub got to half full.

    If it is sucking heaps and you have vacuum behind the cap maybe drive with the cap in loose and see if it continues.
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