RC Car Fuel System

thingiverse

This isn't for actual gasoline, but rather for water. Simply insert a Lego Technic pneumatic tube into the small opening and attach it to the exhaust on the other end. When connected to a belt driving the pulley, the pump will eject water droplets out of the exhaust, creating a convincingly realistic effect. I'll be printing this soon. A small fuel tank is also included, which can be used in place of one you might have, accommodating the Lego pipe perfectly.