Falcon32

Is it possible to have the clunk line inside the tank TOO flexible?
I decided to change the tygon clunk line in the tank for something a little more flexible and I’ve managed to track down some Viton tubing.
The supplier sent me two small samples for me to check out. One of the samples is quite flexible and the other VERY flexible.
My concern is that when the model is vertical, nose down, that the clunk line will fold back over itself and cut the fuel supply.
I would appreciate your views.

Thanks

Falcon

huck1199

I agree with your concern. I usually test the empty tank before installing to make sure it has the right amount of flop side to side, top to bottom and enough stiffness when held front down.  Was the Tygon too stiff?

hanko

drop a viagra in your lawn girl

summerwind

you didn't get too far in school did you?




on a more constructive note however, i do like huck does.

Truckracer

My Feedback: (19)

If you feel the line is too flexible, you can insert a section of solid tubing in the clunk line to prevent it from doubling back on itself. Some people solder a solid line to the clunk that extends near to the line where it comes out the back of the stopper. A short piece of flexible line here also prevents the clunk form falling too far forward as the solid line can only hinge around the rear part of the tank.

hanko

MetallicaJunkie

just like mentioned a long piece of copper will keep the clunk from going to the front of tank

summerwind

hey now that's a cool tank......gotta give one a try.
simple

nonstoprc

My Feedback: (90)

What is wrong with tygon tubing? I always use tygon inside the tank. Just make sure you replace it in one season or two.

MetallicaJunkie

beats having to change a pesky fuel stopper... especially when you solder on babrbs

hanko

cool tank, looks like a soda bottle. Is it?

a1pcfixer

My Feedback: (7)

Most are round water bottles, some are Fiji water bottles.

Here's a good thread about such fuel tanks......
http://tinyurl.com/69j3hed

kenhiraihnl

Nothing really wrong with Tygon (if you use the high-quality stuff that doesn't harden). OTOH, you can use Viton on the pickup line and be done with it...

http://www.mcmaster.com/#5119k41/=czx2le

Falcon32

Hey Guys
Thanks for your answers, I think I'll go with the one that's a little less flexible to stop it folding back on itself.

MTK

I have a quantity of Viton and it works great.....Pricey!!

Looked for an alternative, inexpensive solution and found ester based polyurethane, McMasterCarr #5549K44. Well into the second year now on this material, both inside and outside the tank. I recently took the tank apart to check the tubing and was assured that the choice was good.....the material is as flexible and strong as the day I installed it, some 6 gallons later, 12 ozs at a time. I've converted all my gasoline planes to the PolyU tubing

I will sell the Viton at 3$ per foot (+shipping) if anyone is interested, PM me please. Also have neoprene that I will sell at 0.40$ per foot (+shipping) if anyone is interested