You can find the sewer guy next to the university on the second island
he appears in the evening
you have to defeat the sewer king then get into the sewer with the crowbar
He is on the third screen in the club
give it to a guy behind the 7 11
another part of the map with more shops and jobs, sewer people and a sewer arena
the guy be hind the bar
Buy it for $6925 from a guy at the exit to the second section
you find him in the club.
You have to kill all the sewer people, the last person you kill will give you the fuel cell.
that's not in stick rpg 2,,, its just in stick rpg complete (the first one).
behind the dupster in the second island at afternoon