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25 or 31 gallon gas tank?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by pomai, May 24, 2006.

  1. pomai

    pomai 1/2 ton status Premium Member

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    I need to know what size gas tank do I have. I've never been able to fill it over 25 gallons, but all listing even GM say for my 1988 Blazer I have a 31 gallon.

    Thanks, Ed
     
  2. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Does it have a skid plate under the gas tank?

    If so a 31gal tank would be real close to it. If it's a 25gal take, you'd have about a 1" gap like mine does.

    Even if I run it down past "E" I don't end up putting in more than 20-21gal.
     
  3. pomai

    pomai 1/2 ton status Premium Member

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    Yes is has a skid plate under the gas tank. LMC truck does not list a 88 with a 25 gallon tank and neither does GM.
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    i asked one time on hear in the garage. thay basicly told me if the 2 halfs of the tank are same higth then 25 gal. if bottom is taller than top half then 31 gal tank.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    To put it this way, i've seen alot of blazers over the years and i've only seen one 25 gallon tank. This would lead me to believe that you probably have a 31 gallon tank, but now that i've said this you'll end up with a 25 gallon tank. :rotfl:
     
  6. MattK

    MattK 1/2 ton status

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    who knows, maybe someone stuck it on there along the line.
     
  7. Jonny-K5

    Jonny-K5 1/2 ton status

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    you can run completely out of gas and still have a few gallons in the tank.the pickup is an inch or so off the bottom of the tank. i never get more than 28 gallons in mine, and thats with driving til the engine stalls.
     
  8. muddybuddy

    muddybuddy 3/4 ton status

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    my 88 k5 has a 25gal tank, its annoying, im lookin into a 40gal tank eventually along with diesel swap
     

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