Can you fill it too full?

[rfequity1]

This question is kind of an extension of another question I had about the motor being hard to turn over. Is it possible I'm filling the tank too full and pushing fuel into the pressure port on the muffler and then pushing it into the carb?

[mccrind]

Tip heli towards muffler tip. If fuel came out, then yes.

[fiveoboy01]

Easy way to prevent this is to have a clamp on your carb line. You should have one anyways to prevent fuel from gravity feeding into the carb when not running.

[Steelie]

yes, you can fill too full and do exactly what you asked about.

[invertmast]

yes, you can fill too full and do exactly what you asked about.

No you can't. the way the engine is positioned, it is theoretically IMPOSSIBLE to fill the tank so full that it drains into the muffler and THEN into the carburetor. the muffler exit point is well below the carburetor, so fuel will never reach the carb, it will just drain out of the exhaust port on the muffler.

the only way you can force fuel into the carb during fueling is if your not using a shutoff clamp before the carb and after your refueling point.

[rfequity1]

What I mean is that you can force fuel into the cylinder and then hydro lock it when you try to turn in over with all that fuel.

I'm just trying to figure out why it's so hard to turn the engine over after it hasn't been run for a few days.

[Steelie]

yes, you can fill too full and do exactly what you asked about.

ooops. Invertmast is right if you are using a muffler that has a pressure nipple located somewhere on the body of the muffler. If you have the Align muffler, the pressure nipple is located on the exhaust flange, next to the exhaust port of the engine. There is a possibility that fuel entering at this point, could enter the engine, thereby flooding it. Never will get up to the carb as Invertmast said, the carb is higher in elevation.
I should have read your post a bit more closely.:badair: My bad.

[Steelie]

What I mean is that you can force fuel into the cylinder and then hydro lock it when you try to turn in over with all that fuel.

I'm just trying to figure out why it's so hard to turn the engine over after it hasn't been run for a few days.

Sounds like you are not immediately closing off the fuel supply to the engine after your last flight of the day. Fuel left in the tank or header tank will get into the engine before you even leave the field, particularly if you put the plug in the exhaust stinger at this point. You then are allowing temp changes, i.e. transporting in the hot car, leaving in the sun,... to pressurize the fuel system. All that air and fuel E X P A N D S in the tank as it warms, forcing fuel into the engine.
Try disconnecting the fuel line at the carb and pinching off with the clamp as soon as the rotors stop, after you land. Then pump the remaining fuel from the tank(s). A lot of guys store unused fuel in the tank or header. You can do this IF you close off the fuel system.

[rfequity1]

What do mean by "close off the fuel system"? Do you mean disconnect from the carb and leave disconnected?

[cudaboy_71]

What do mean by "close off the fuel system"? Do you mean disconnect from the carb and leave disconnected?

he means clamping the fuel line between the tank and the carb with the black doohickie at the top of the picture

http://www.readyheli.com/v/vspfiles/photos/HN6022-2.jpg

[Y@nkee]

What I mean is that you can force fuel into the cylinder and then hydro lock it when you try to turn in over with all that fuel.

I'm just trying to figure out why it's so hard to turn the engine over after it hasn't been run for a few days.

Yes you can, depends if the exhaustport is open or not, but this is very possible to do.

Your engine also can be a pain to get started first time due to old oil getting very thick and gooey, if your starter is on the weak side this can make the first start of the day a pita.