I went to start my gasser today and couldn't get it to start. The plane last flew in October and hasn't seen gas since. I pulled the tank and noticed the line is stiff and the clunk is closer to the top of the tank.

What kind of line do I use inside of the tank. I think most of the line is the tygon.

Is this line any good for use inside of my tank? http://www3.towerhobbies.com/cgi-bin...?&P=8&I=LXRZ80

That looks like neoprene. Works fine and stays flexible a lot longer than tygon.

There are other gas fuel lines available that work. I use neoprene inside the tank and tygon on all the lines outside the tank. The neoprene is more expensive than the tygon and the only part of the system that needs to be flexible is the clunk line. The carb line and the vent line and the fill line don't need to be flexible. Thats why I use tygon for them.

You can buy or solder little barbs on your fuel lines too. Helps keep the tubing from slipping off. I mostly do that on the outside of the tank where the tygon is. It has a tendency to become stiff and lose the elasticity over time. The barbs will keep it from slipping off. In my experience, neoprene won't slip off unless you just bought tubing that was too big for the brass lines.

There's some other tubing available. Aero - something something. Somebody will know what it is.

Aerotrend, Viton, Tygon, neoprene, are all gas compatible. None last forever.

Thanks. I will pick up some neoprene. It looks like the yellow tygon line inside of the tank. I cannot hear the clunk rattle at all. Will I need a new stopper as well? I know in the glow tanks, I can never get the stopper back in the tank after I pull them apart.

Best to obtain a new one.

I'd also recommend the Hayes Neoprene from Tower, and a filtered clunk.
Sam

I bought some neoprene at my LHS and it didn't fit the tank or clunk lines. I put on some regular fuel line that I think was blue trend. I am going to pull it back out because I am not sure. The guy at the hobby shop said aerotrend is out of business???

I ended up getting some tygon at another shop. they said I just need to replace it annually.

Just pick up your plane and rotate it. If you hear the clunk move around the tygon is still flexible. There is Tygon out there that stays flexible inside the tank for years. (Not Aerotrend) I just replumbed a 3 year old tank and the Tygon pickup was still flexible.
Not saying neoprene is bad but for me I like the slightly stiffer Tygon for not letting the clunk get stuck at the front of the tank like neoprene can or might.
No problem with the brown stopper going back into the hole either. It retained it's original shape shortly after removal.

aerobat,
I would not put Tygon iside the fuel tank at all. It does not necessarily take a year for this stuff to get to be to stiff to enable the clunk to go to the bottom and top of the tank. Just for an example, I have a new ARF that has a pre-plummed tank. Without ever even having gas in the tank the clunk hangs in mid-air and does NOT settle to the bottom of the tank at all. I will be removing the tygon and replacing it with Hayes Neoprene with barbs and tie wraps and a stiffener to keep the line form falling forward like I have been doing with all my gassers.... Without the clunk going to the full top or bottom or sides of the tank how often do you think the clunk will be submerged in gas? Fix it right the first time. Planes are to expensive to be playing guessing games. Bill