3 line fueling

[treetopflyer]

when using a 3 line system how do you keep fuel from flooding your engine This is my first gas engine birelli gt 26. I want to use a fuel dot.

[GremlinX]

I tell you this much. I quit using 3 lines years ago on gassers. I put a T in for the fuel/defuel (clunk) and one for a vent. A 3 line is just asking for more weight, confusion, and lines to come off.... Line from dot goes to the long side of the T. Fuel line from the carb is one of the short sides of the T, and then of course the other goes down in the tank. You just need to be careful when fueling. Don't crank the crap out of the fuel when it gets toward the full side of the tank, it can flood the carb, but not likely. You'd have to push it 8psi or more to get it to flood...

[treetopflyer]

thanks for reply . I like your way think i'll try that.

[Mokken]

	Quote: Originally Posted by treetopflyer
	when using a 3 line system how do you keep fuel from flooding your engine This is my first gas engine birelli gt 26. I want to use a fuel dot.

Gas engines that have a diaphragm type carburetor will not flood when you are fueling, so don't worry about that. But as someone has already pointed out, two lines are best and the most popular.

[Wayne]

You cannot flood the carb on a gasser with a 2 line system.
The line to the carb is esentially not there when the engine is not running. The fuel will not travel that way.

[sweetpea]

I prefer 3 line.......but 2 works just as fine.

I don't find them confusing and in 5yrs never had any fuel line come off. Of course I change my lines out each flying season as well.

[Bob S]

	Quote: Originally Posted by GremlinX
	A 3 line is just asking for more weight, confusion, and lines to come off....

There are actually two fewer connections or "lines to come off" in a 3 line setup aren't there? In a 2 line setup there are 3 additional connections that if they come off will kill your engine. (If any of the 3 connections comes off the tee it will deadstick.)

A 3 line setup is not complicated and only requires an extra pipe going into the tank. As far as weight goes you are adding the piece of pipe instead of a tee fitting. Not a big difference if any.

Personally I like the idea of a direct, uninterrupted line going from the tank to the carb.

To each his own.

[Pale Rider]

	Quote: Originally Posted by Bob S
	Personally I like the idea of a direct, uninterrupted line going from the tank to the carb.

Same here--besides I hardly notice that huge weight penalty of an extra clunk and piece of fuel tubing.

[snap a saurus]

3 lines here, never ever had an issue, I replace the fuel tubing inside the tank, every 2 years.

[Mithrandir]

I too prefer a 3 line system.. with one single uninterupted fuel line from the tank to the Carb... more reliable then inserting a T and a Fuel dot into the fuel supply line.
Other two lines are both connected to bent overflow tubes in the tank so you can fill with either line without siphoning.

[flyin4fun]

	Quote: Originally Posted by Mithrandir
	I too prefer a 3 line system.. with one single uninterupted fuel line from the tank to the Carb... more reliable then inserting a T and a Fuel dot into the fuel supply line. Other two lines are both connected to bent overflow tubes in the tank so you can fill with either line without siphoning.

When you say "uninterupted'....do you NOT use a inline filter??
if not, how do you filter your fuel??

[rc4flying]

	Quote: Originally Posted by GremlinX
	I tell you this much. I quit using 3 lines years ago on gassers. I put a T in for the fuel/defuel (clunk) and one for a vent. A 3 line is just asking for more weight, confusion, and lines to come off.... Line from dot goes to the long side of the T. Fuel line from the carb is one of the short sides of the T, and then of course the other goes down in the tank. You just need to be careful when fueling. Don't crank the crap out of the fuel when it gets toward the full side of the tank, it can flood the carb, but not likely. You'd have to push it 8psi or more to get it to flood...

Oh Please ?????

I have been using 3 lines for over 32 yrs and NEVER, EVER had any problems. Gas or Glow.

[Mithrandir]

	Quote: Originally Posted by flyin4fun
	When you say "uninterupted'....do you NOT use a inline filter?? if not, how do you filter your fuel??

The fuel is filtered twice before it even goes into my aircraft fuel tank... I have never used any onboard fuel filters with Gas.... Keep the source clean.

[GremlinX]

	Quote: Originally Posted by Wayne
	You cannot flood the carb on a gasser with a 2 line system. The line to the carb is esentially not there when the engine is not running. The fuel will not travel that way.

Not that it matters, but you can absolutely overpower the diaphragm and needle with pressure. Not to brag, but I know a lot about these little carbs and what makes them tick. When we use electronic fuel pumps on the real hi HP motors that use a pumper style carb, we leave the electric pump off until it's running pretty good. The Vacuum style pumps won't pop the needle back though... just a thought.

[Wayne]

I know your right..
I was talking about a "normal" fill. Crank or electric your not going to over pressure it.