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suburban big tank/31 gallon K5 tank senders the same

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dyeager535, Sep 4, 2003.

  1. dyeager535

    dyeager535 1 ton status Premium Member

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    As far as I can tell. My '85-86 parts manual lists different part numbers for the big and "little" tanks, but I pulled the TBI sending unit out of the large Suburban tank, and held it up to my '89 K5 sender, and they were identical as best I could tell.

    Anyone have any idea what the reasoning would be behind GM listing them as different part #'s? That certainly contributes a whole lot more TBI sending units to the K5 scene. Don't let them go to waste! /forums/images/graemlins/smile.gif (sorry Suburban owners...just see more TBI 'burbs being scrapped than TBI K5's around here)
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Well that would explain why my burb with a 40 gallon tank is showing near empty with about 10 gallons in the tank. Is the pick up longer or the same?
     
  3. Muddytazz

    Muddytazz 1 ton status

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    No idea....here are the dimensions for the tanks

    25 gal = 28-3/4 x 28-1/8 x 10-3/4

    31 gal = 28-3/4 x 28-1/8 x 12-3/4

    40 gal = 35 x 28-3/4 x 13-1/8
     
  4. u2slow

    u2slow 1/2 ton status

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    I installed a used '91 Burb pump/sender in a 87-91 31-gallon K5 tank that I put in my '91 crewcab back when it had a TBI 350. Worked just fine... /forums/images/graemlins/smirk.gif
     
  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    [ QUOTE ]
    No idea....here are the dimensions for the tanks

    25 gal = 28-3/4 x 28-1/8 x 10-3/4

    31 gal = 28-3/4 x 28-1/8 x 12-3/4

    40 gal = 35 x 28-3/4 x 13-1/8

    [/ QUOTE ]

    What would just suck is if GM was just throwing in the same sendors and pickups to get them out the door. That would mean having a 41 gallon tank is point less because the pick up would never be able to get the last 10 gallons out of it. The way my gage reads I'm about positive I have a 31 gallon sender in there like DYeager found.
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Didin't measure tank depth for the 'burb, just pulled the sender and held it up to the one *I* pulled from a TBI K5. There is NO difference I can tell. I specifically checked for the pickup, and they are exactly the same height. With only what, 1/2" difference in depth between the 31 and 40 gallon tanks, no reason to use different senders IMO, although with that much area, 1/2" more probably gives you a gallon or two more fuel.

    I should check out more closely the orientation of the fittings on top, but with my fairly detailed examination, they also seemed to be identical to the K5 sender. For all intents and purposes, if the sender depth is the same, the sender is close enough to work in the K5.

    With tank depths being that close, the only sender I can see being different is the small tank, since it's about 2" shallower.
     
  7. shane74

    shane74 1/2 ton status

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    On a side note, how easy/hard is it to install a 40 gal /forums/images/graemlins/burb.gif tank into a /forums/images/graemlins/k5.gif?? I have been thinking about this for some time. Is it a bolt in? Or only minor mods needed?
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Believe it's been discussed before, but the way I see it, adding the 'burb tank to a K5 puts it pretty close to the axle. Besides, at least on my '81 frame, there is a crossmember JUST forward of the gas tank, that would have to be modified/moved/worked around if the tank were to fit there.

    I'm sure it can be done, but it didn't look like a simple bolt in.
     
  9. u2slow

    u2slow 1/2 ton status

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    I think it would be tough unless you have considerable lift. The tank is 6" longer for starters. My shortbox was only 31-gallon friendly - and I believe they have slightly more overhang than a K5.
     

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