I need to replace my sending unit because it stops reading at about 3/8 of a tank. I was going to order new tank straps to make the job easier but I don't know which size tank I have. Is there a digit in the vin that would say? There's no sticker under the hood or in the door opening giving the factory equipment specs.

 

I know on my C30 you can tell the difference by the way the lines come out the top of the sender. Rockauto has good pictures and there should be a tag on the wiring on the sender with a code that helps also.

 

Its been discontinued by GM but its 33 gallons according to GM itself. The link for proof is located here:

http://ttps://www.gmcertifiedparts.c...QtM2wtdjYtZ2Fz