I dunno' Breezie, sure it's an old single dome tanker, but with the differences in wheel configuration, side step configuration as the difference in the molded text, I'm not ready to attribute this to Tootsie Toy.
It may be helpful to get a read on that capacity figure (CAP) #?, as I read it as 92200. It may help in the search for a definitive match.
A lot of slush mold (type of die cast) toys weren't maker marked, as they were smaller companies, mostly in the Kansas City area, rather than the big names like Tootsie Toys which were usually marked (the name being in the casting mold).