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Fuel Sender Question

Discussion in 'The Garage' started by kazajames56, Oct 15, 2003.

  1. kazajames56

    kazajames56 Registered Member

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    Hey everyone this is my first post, and it's a question.

    Does anyone know if the fuel sending units in the tank are the same size for the 31 gallon and the 40 gallon tanks? I'm planning a TBI swap, and my truck has a 31 gallon tank, but the donor is a 40 gallon.

    Thanks!
    Steven
     
  2. doctor4x4

    doctor4x4 1/2 ton status

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    HEY HEY
    Welcome
    2 CK5
    anouther member and i just went threw this
    but i still dont honestly know
    mabe look at switching the tanks as bigger is better right ??? :-)
    or call the parts dept of your local dealer have him check part nus for ya
     
  3. MOABDADC22

    MOABDADC22 1/2 ton status

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    According to LMC, the sending units are different for a 25 and a 31 gallon tank. Hope that helps. /forums/images/graemlins/thumb.gif
     
  4. kazajames56

    kazajames56 Registered Member

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    Hey thanks for the help. I'd drop and switch the tanks, but the 40 gallon is in a Suburban and it's about six inches longer than the frame of my Blazer allows. Maybe I'll take them out and compare them.

    Steven
     
  5. MarcS

    MarcS 1/2 ton status

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    I'm doing mine now. I have only heard of a 25 & 31 gal. tanks in a K5. But the sending unit/pump pickup sock should reach to the bottom on the tank. Mine is a 31 gal 12 inches deep. The sending unit is about 12 inches long from the inside flange to the pick up sock. Hope this helped.
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    GM lists different senders for the 31 and 40 gallon tanks in 1985-86.

    I pulled a later sender (TBI) out of a 40 gallon tank, and compared it with the one out of a 31 gallon tank, and it was identical. It was fairly obvious the 40 gallon sender had been messed with (steel lines cut off and hose clamped) so I'm not 100% certain there is no difference in the two. The only important difference will be the tank depth in reality, if dealing with the same year.

    I'd measure the depth of the 31 gallon tank from the mounting flange for the sender, and then measure the distance the sender drops from the flange. As long as it doesn't hit the bottom of the tank, or sit too high (unlikely) you'll be fine.
     
  7. kazajames56

    kazajames56 Registered Member

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    Well that sounds cool to me. The sender is from an '89 TBI, so hopefully it'll all work out.

    Thanks for the replies
    Steven
     

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