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FL80/8.3 Cummins wiring

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by AModelCat, Apr 5, 2024.

  1. Apr 5, 2024 #1
    AModelCat

    AModelCat Road Train Member

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    Sorry, don't have the VIN or ESN/CPL available.

    My neighbour called me the other day, having issues with no power to the fuel pump solenoid on his truck. I believe he said it was a 2000 or 2001 FL80 with an 8.3L Cummins. He says its a mechanical fuel pump on it but I can't confirm anything as I have not laid eyes on it yet. Just gathering some information right now.
     
    Last edited: Apr 6, 2024
    AModelCat, Apr 5, 2024
    AModelCat, Apr 5, 2024
    #1
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  3. Apr 5, 2024 #2
    062

    062 Road Train Member

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    062, Apr 5, 2024
    062, Apr 5, 2024
    #2
    SmallPackage Thanks this.
  4. Apr 6, 2024 #3
    pup

    pup Light Load Member

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    Bosch p pump is an inline pump. Shut down solenoid has 3 wires. Hold in, pull in & ground. Pull in is a high amp
    circuit that's energized when the starter is engaged. Hold in has key power low amperage circuit. Typically if there's
    no key power to the hold in the engine will fire & shut off when you release the starter. No pull in the engine won't start
    but you can key on & manually pull the solenoid to run & it will hold. By 2001 I would expect it to be a caps fuel system
    which is very different. Electronic controls . Lots of pieces to it. Hopefully its older as caps stuff can
    be hard to get & expensive.
     
    pup, Apr 6, 2024
    pup, Apr 6, 2024
    #3
    AModelCat Thanks this.
  5. Apr 6, 2024 #4
    AModelCat

    AModelCat Road Train Member

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    I think its a caps system. He said something about that but couldn't remember until you jogged my memory.
     
    AModelCat, Apr 6, 2024
    AModelCat, Apr 6, 2024
    #4
  7. Apr 6, 2024 #5
    Ridgeline

    Ridgeline Road Train Member

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    2000 has a CAPS injection system, so it could be an electric lift pump (IIRR).

    https://www.thoroughbreddiesel.com/assets/1/pdf/troubleshooting-tree.pdf
     
    Ridgeline, Apr 6, 2024
    Ridgeline, Apr 6, 2024
    #5
  8. Apr 7, 2024 #6
    SmallPackage

    SmallPackage Road Train Member

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    The only wiring diagram i have for the business class is for Cat 3126 equip.
     
    SmallPackage, Apr 7, 2024
    SmallPackage, Apr 7, 2024
    #6
    AModelCat and 062 Thank this.
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