Motor Observations/Possible Issues.

[EBCooper]

Can someone tell me why fuel runs out of my carb. This happens after I land and run the tank dry until the motor dies. If I tip the heli forward or tail up fuel runs right out the barrel of the carb, its about a half a water bottle cap full, is this normal?

The other thing is when I fill the tank I pinch off the fuel line to the carb then fill the tank but the tank builds up pressure unless I take the fuel line from the muffler off to relieve the pressure as the tank is filling. Its like the air thats removed from the tank has a hard time passing through the pipe, and yes the plug is out of the end of the pipe.

Just wondering if these are normal things, my motor starts and runs perfect so there's really no issues. It just doesn't seem right to me.

BTW its the OS Hyper 50 and Align Pipe.

[TheBum]

You might make sure that the pressure hole in the tank is not partially obstructed by plastic left over from the manufacturing process. I used Finless's suggestion of taking a 1.5mm hex driver and using it to ream out the hole. I get enough air flowing out while filling the tank that I see fuel bubbles in the pressure tubing as the tank starts to get full.

[EBCooper]

I did do that and the air comes out of the tank just fine but when connected to the pipe it builds pressure.

[TheBum]

I have the same engine and pipe (maybe) and I've never had that problem. The reason I say "maybe" is because I've seen two versions of the Align pipe; they're distinguishable by the location of the pressure nipple. Is the nipple on yours on the connecting duct or on the pipe itself?

You're not doing something silly like putting the exhaust tube plug in when refueling, are you?

[EBCooper]

The nipple is on the duct between the pipe and motor.

[jpappano]

Make sure the nipple in the muffler that the vent line to the tank plugs into is not plugged up. Try hooking a piece of fuel line to it and blow through to check it.