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Fuel Gauge

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tripple L, Mar 9, 2023.

  1. Mar 9, 2023 #1
    Tripple L

    Tripple L Bobtail Member

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    Mar 9, 2023
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    Have a 2012 Freightliner Cascade.Truck was running very good.Fuel gauge not working will that cause my truck to shut down. I my tank is full.. But the gauge is reading empty.
     
    Tripple L, Mar 9, 2023
    Tripple L, Mar 9, 2023
    #1
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  3. Mar 9, 2023 #2
    Mnmover99

    Mnmover99 Light Load Member

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    Oct 22, 2022
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    Check for valves on the fuel tanks. May be shut off not allowing return fuel to go into tank that the system draws fuel from. Also check that breathers are open on top of tanks. Could also have valves under cab on the part that distributes return fuel from the engine to the tanks.
     
    Mnmover99, Mar 9, 2023
    Mnmover99, Mar 9, 2023
    #2
  4. Mar 9, 2023 #3
    Hayfieldmn

    Hayfieldmn Light Load Member

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    Sep 10, 2016
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    Fuel Guage shouldn't matter, just know your fuel level till you get it fixed, DEF Guage will cause it to de rate if that one goes bad.
     
    Hayfieldmn, Mar 9, 2023
    Hayfieldmn, Mar 9, 2023
    #3
  5. Mar 10, 2023 #4
    Tripple L

    Tripple L Bobtail Member

    4
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    Mar 9, 2023
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    What if the DEF is deleted..
    if
     
    Tripple L, Mar 10, 2023
    Tripple L, Mar 10, 2023
    #4
  7. Mar 11, 2023 #5
    Tripple L

    Tripple L Bobtail Member

    4
    0
    Mar 9, 2023
    0
    My 2012 Freight-liner Cascade will not stay crank .I have replace the fuel gage, replace the filters.I can run for about a 100 miles and it would shut down. When that happen I have to manually pump the fuel prime switch under the hood and it will run about another hundred miles or less and it shut down again. I will have to repeat the same process all over again. Anyone knows what is causing this problem?
     
    Tripple L, Mar 11, 2023
    Tripple L, Mar 11, 2023
    #5
  8. Mar 11, 2023 #6
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    It sounds like you have a suction leak in the fuel system causing air to enter. When you prime the hand pump it can overcome the the leak or bring enough fuel to get it to run in short bursts. Once the air overcomes you are losing prime. Going to take some clear lines or some pressure testing to sort the issue.
     
    Goodysnap, Mar 11, 2023
    Goodysnap, Mar 11, 2023
    #6
  9. Mar 11, 2023 #7
    Tripple L

    Tripple L Bobtail Member

    4
    0
    Mar 9, 2023
    0
    Is that something I can or should I take it to a shop.

     
    Tripple L, Mar 11, 2023
    Tripple L, Mar 11, 2023
    #7
  10. Mar 11, 2023 #8
    Goodysnap

    Goodysnap Road Train Member

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    I would take it in.
     
    Goodysnap, Mar 11, 2023
    Goodysnap, Mar 11, 2023
    #8
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