2.5 gals of DEF then empty?

Discussion in 'Questions From New Drivers' started by I3IGBIRD26, Jan 24, 2022.

  1. I3IGBIRD26

    I3IGBIRD26 Bobtail Member

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    Jun 25, 2021
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    Similar but not exact on here-

    Bought a 2014 t680 w/ 554k miles. DEF indicated 3/4 when I got in. Took me longer than I’m going to admit to realize it wasn’t moving. MIL light came on but no engine light. DEF tank never takes more than 2 gals. Gauge goes to full than drops to 3/4 quickly. Then weird things start happening if I don’t fill up with another 2gals. I’ve just started carrying an extra 2.5 gals with me. Sometimes the “STOP” light flashes for a mile then goes out. As soon as I put 2gals back in (and it shoots back out) everything goes back to normal. It’s getting expensive and time consuming. I’m new and on my own but 2gals to fill tank??? Never takes more.
     
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  3. Siinman

    Siinman Road Train Member

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    Kansas City, MO.
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    Should. be around 15 gallons. Something wrong
     
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  4. Magoo1968

    Magoo1968 Heavy Load Member

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    You left out a important part How Far can you travel on those two gallons .. part of me thinks you have a partial delete of def system.
     
  5. Mike250rs

    Mike250rs Heavy Load Member

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    Raleigh, NC
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    Could be a DEF level sensor going bad.. or somebody was "tinkering" and botched it.
     
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  6. I3IGBIRD26

    I3IGBIRD26 Bobtail Member

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    About 400 miles
     
  7. Magoo1968

    Magoo1968 Heavy Load Member

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    That’s normal consumption so most likely level sensor
     
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  8. WesternPlains

    WesternPlains Road Train Member

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    System is goofed up. Get it fixed.
    You do realize. If you run out of DEF. You’ll burn your truck down. Literally.
     
  9. Ffx95

    Ffx95 Road Train Member

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    I’m guessing the def quality sensor. If it is don’t ignore it and get it checked cause eventually it’ll leave you on the side of the road in limp mode. Not sure if paccar dealerships are back to stock with those sensors if they still aren’t they’ll probably have the truck computer bypass it. Your def gauge won’t work afterwards you gotta make sure it’s always full.
     
  10. Long FLD

    Long FLD Road Train Member

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    Lol. What?

    200 miles per gallon sounds about right. Since you have lights that come and go you should get in and get the def sensor checked. Your truck will derate if the computer thinks your def tank is empty.
     
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  11. Mike250rs

    Mike250rs Heavy Load Member

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    Depending on the model.. I had a truck down for 3 weeks waiting on one.
    After many phone calls with the sales guy and shop, they were given 3 choices:
    1. Fix it
    2. Provide a free rental
    3. Make the truck & driver payments

    Truck was on the road 2 days later.
     
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