A Technic set from ~1997 with a long grey batter box I had a Technic set when I was a teen, about 1997 (by looking at the wheels, see picture). From what I remember, it was a tank truck. In its tank it was carrying 3 C batteries. In the picture, you can see the tank closed above, opened in the middle and on the right, the numbers written on the parts. The number "1-01" (or "1  01") is on the tank's three parts. The other (4351) is only on one of the three parts. I'd like to know its set number so I could find its instructions.
Looking at that part and doing a little digging, could this be the set you were thinking of. it is not a Technic set as such, it is a much older set but it seems to be the only one with a tanker and that wheel in.

Basic Building Set
Item No: 740-1
Year: 1985

https://www.bricklink.com/v2/catalog/catalogitem.page?S=740-1#T=I