ORIGINAL: opjose
Tygon has a very low melting point making it a POOR if not dangerous choice for glow fuel lines.
It melts quite easily when in contact with a glow engine, where silicon does not.
( heck I wish we had a better alternative to Tygon for gas lines, as I've lost a plane due to brief contact of a vent line with a muffler exhaust tube. ).
I've seen gas melt glow fittings in a matter of a week, and glow melt gas fittings in equal time.
There is a reason we do not interchange these things.
They make a black neoprene fuel line that works great with gas or glow and doesn't harden like tygon so you don't need to reline your gas tanks every year. Some hobby shops even have it in stock, others just say they are out and ordering more. [>:]