carburetor nipple fuel filter If the fuel tank is located higher than the crab, fuel liquid might flow to the crab even when engine is stopped. So please stop the fuel flow by using a clip, clamp or cock. pipe for pressure induction pipe for fuel induction plug \ CC W(make the fuel rich) Carburetor inlet check valve Rear cover filter (for breather) Not use if the back pressure is low Fuel tank muffler tail outlet check valve CCW (decrease pres > relief nipple to outside of the fuselage or bind as figure sho