The gas goes into the big tank with the large cap-I got that part straight, but this is a small molded tank with a small filler that probably holds about a quart, looks like oil or trans/hydraulic fluid, possibly for the auto tranny? When I got the little sucker the tank was about 1/2 full so I didn't investigate it then. When I dug the mower out of the barn last week-end the tank was MT.Pat /forums/images/graemlins/confused.gif