ORIGINAL: superd09
So I bought a new tank and same problem. When the plane is running level its good but as soon as I point the nose down I can see air bubles in the fuel line then it dies. This is with a 1/3 of a tank fuel. When its full its fine. Basicly I can fly for half a tank and I better land or if the tank get to 1/3 any pointing down with my plane it will starve
This is normal, you could find more flexable fuel line, allowing the clunk to move foward but this can cause problems with the clunk knoting around the pickup line. opjjose was correct as this is not normally an issue when flying. If it is an issue you could try a header tank. If it is a problem then a rucher mixture will keep the engine running while it sucks out the bubble. Normally if the RPM is peaked with the nose straignt up and the tank less than 1/4 full, then it is rich enough to run through the bubble. Possibly not on the ground though.