Fuel tanks VS fuel gauge

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by EricS., Oct 23, 2020.

  1. EricS.

    EricS. Bobtail Member

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    Have a 2009 KW T800 driver side fuel tank is unused do to a crack, and has had the cross feed turned off and hoses removed and capped.
    But the sending unit is still wired / causing a false reading. I unplugged the unit but then I got an empty reading even with the other tank full.
    How do I bypass this?
     
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  3. cjb logistics

    cjb logistics Heavy Load Member

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    Does a 09 not have two gauges like a 10. If so just plug it back in and let the little yellow light flash on bottom of second gauge.
     
  4. Mike250rs

    Mike250rs Medium Load Member

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    If you want a working gauge, the sending unit will have to be in the working tank. Otherwise, just leave it unplugged and keep track of your fuel burn.
     
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  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    Mike if he ran two wires from the empty tank to the sender on the other tank. All four wires on one sender do you thank would work without spending a lot of money? I do not know but do not see how that would damage anything to try?
     
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  6. AModelCat

    AModelCat Road Train Member

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    Which tank is the sender in?

    TBH, never saw a truck with two fuel gauges before.
     
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  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    Sounds like both. There are - were some trucks here like that with one gauge and two senders. I have seen others with duel gauges as cjb mentioned. Then the ones with duel senders and a single draw tank. They have an electric fuel pump above the bell housing. A computer monitors senders and turns the fuel pump on and off.
    You are correct as usual that he should double check what he has before posting. The last 6 of the vin also gives some people the ability to help more.
     
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  8. AModelCat

    AModelCat Road Train Member

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    That's why I love this site. Always learning!
     
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  9. stillwurkin

    stillwurkin Road Train Member

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    The 1993 pete 379 I had and this 2001 I have now have 2. 1 guage on the dash with a switch for either left or right side. Other than these all other trucks I have experience with just 1 guage.
     
  10. Mike250rs

    Mike250rs Medium Load Member

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    Depending how his sending units are wired, a shunt on the dead tank could give it a false full.

    If the dead tank will not be repaired any time soon, the 2 sending units wires could be combined going to the live tank. ( Use real weatherproof connectors, not some crimp on crap ). Both gauges would then read the live tank & sending unit.
     
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  11. EricS.

    EricS. Bobtail Member

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    Okay ... so more info ...the truck is a 2009 T800 Kenworth quad axel dump truck. With the c13 cat , last 7 of vin R992628.
    It has a 75gal on the driver's side and a 100gal on passenger side.
    The driver's side is unused and has no hoses hooked up (they are capped off) and no sending unit only a over fill / expansion hose
    When the main tank is full I'm lucky to read 5/8 full .
    Tank seems to be correctly oriented and not rolled back.
    Thinking the sending unit float gets hung up somehow??
     
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