84 sending unit replacement

Discussion in 'Tech Discussion' started by Kevin Dugan, Sep 27, 2018.

  1. Kevin Dugan

    Kevin Dugan Junior Member

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    I have an 84 C10 with a single tank on the driver's side. The sending unit is bad.
    What is the best way to replace it?
    TIA,
    Kevin
     
  2. 1973c10

    1973c10 Full Access Member

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    I think you have 2 options drop the tank to pull the sending unit
    or pull the bed to get to the top of the tank to pull the sending unit
     
  3. Gpaw44

    Gpaw44 Junior Member

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    I am looking at the same thing. I have done both and I am thinking it is easier to pull the bed. Everything is very visible with the bed off!
     
  4. Kevin Dugan

    Kevin Dugan Junior Member

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    Thank you.
     
  5. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    I’ll play devil’s advocate here and advocate for dropping the tanks. It’s worth it to clean it out and inspect for rust. If it has it, a good, old school radiator shop can rod it out. If it’s never been done, expect the tank to be filthy. If the truck sat for a prolonged period of time throughout its life, expect surface rust. Ethanol attracts ambient moisture which leads to that rust over time.
     
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  6. Kevin Dugan

    Kevin Dugan Junior Member

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    So how do I know what size tank it has before I drop it?
     
  7. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    If it’s a SWB, it’s got a 16 gal. If it’s an LWB, it came with a 20, which is what it’ll have unless someone stuck a 16 there for whatever reason.
     
  8. Kevin Dugan

    Kevin Dugan Junior Member

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    Thank you.
     
  9. donnieray

    donnieray Talks to dogs and trucks. Supporting Member

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    On my 84k long bed I was able to remove the bed bolts and jack the front of the bed up enough to do the job. In my case the tank was clean inside but I chose to replace all the rubber lines. It would just be crazy not to. Don't forget to unbolt the filler hose from the bed.
     
  10. bucket

    bucket Super Moderator Staff Member

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    If it's a short bed, you have to drop the tank because the sender is under the cab. Probably the same on a long bed truck with a 16 gallon tank.
     
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