Three line fuel system
11-25-2011 | 12:56 PM
#1
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From: Fort Myers Florida OH
Three line fuel system
After untold years of using two line systems I am ready to try a three line system. The question I have is; what do you use to hold the two clunks together? I don't want them coming loose and getting the lines tangled up.
My three gasers now all have two line systems with a Tee in the line to the carb with a line from that running to a fuel dot. From what I am seeing a lot of people use a three line system instead. Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now?
My three gasers now all have two line systems with a Tee in the line to the carb with a line from that running to a fuel dot. From what I am seeing a lot of people use a three line system instead. Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now?
11-25-2011 | 01:35 PM
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RE: Three line fuel system
I think,for gas,the two line system is KISS! I have used three but
position the "second" (fuel/de-fuel)line in the tank straight
down as to not interfere with the engine pick up clunk.(Do this
mainly for nitro engine.)
position the "second" (fuel/de-fuel)line in the tank straight
down as to not interfere with the engine pick up clunk.(Do this
mainly for nitro engine.)
11-25-2011 | 01:37 PM
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From: Fort Myers Florida OH
RE: Three line fuel system
My bad, I am using tee's now with my two line systems but was reading that some have had air leaks around the tees. I am also concerned that the air in the line to the fuel dot could cause fuel draw issues when the carb tries to pump thru the line.
11-25-2011 | 01:57 PM
#7
RE: Three line fuel system
I've been running three line setups for as long as I can remember, more than 10 years, and have never "tied" the clunks together in any way. Even when doing rolling harriers I've never had an issue with them becoming tangled. I have had issues with the TEE leaking when I was using a two line system and that's the reason I'm using a three line now.
11-25-2011 | 05:31 PM
#9
RE: Three line fuel system
When you live in an area that can be as humid as the Caribbean can be at times, having a Tee fitting in the feed line to the engine can cause problems other than an air leak, so the three line system works best for me.
Karol
Karol
11-25-2011 | 07:29 PM
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From: Bemis,
NM
RE: Three line fuel system
" Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now? "
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
11-25-2011 | 09:10 PM
#11
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From: Hoquiam, WA
RE: Three line fuel system
Why would you need a clunk on the Fill/defueling line? I have used a 3 line system for years also, and have just run the fill/defuel line to the bottom corner of the tank. it pulls all but about a teaspoon of fuel out. never have had a problem with the lines getting tangled.
11-26-2011 | 12:21 AM
#12
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RE: Three line fuel system
ORIGINAL: Rick Sowell
Why would you need a clunk on the Fill/defueling line? I have used a 3 line system for years also, and have just run the fill/defuel line to the bottom corner of the tank. it pulls all but about a teaspoon of fuel out. never have had a problem with the lines getting tangled.
Why would you need a clunk on the Fill/defueling line? I have used a 3 line system for years also, and have just run the fill/defuel line to the bottom corner of the tank. it pulls all but about a teaspoon of fuel out. never have had a problem with the lines getting tangled.
I have examples (from this very forum) for every one of your fingers and probably the toes as well)
11-26-2011 | 05:56 AM
#13
RE: Three line fuel system
ORIGINAL: Ed
'' Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now? ''
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
'' Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now? ''
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
11-26-2011 | 09:49 AM
#16
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RE: Three line fuel system
Besides the reasons stated in favor of a three line tank, such as less possible leak points and not introducing air into the line going to the carb when re-fueling, there is another reason I like three line systems. With a two line fuel system, you are putting the fuel in before the tank clunk/filter, and can introduce crud into the fuel line and between the filter and the carb. Any crud that gets pumped will actually be trapped on the wrong side of the clunk/filter, and will go straight to the carb when the engine is run. With a three line system, the clunk/filer and line to the carb remain closed, and all fuel is filtered before it goes to the carb.
This assumes you are using a clunk/filter like the Walbro felt one, which you should be doing....
AV8TOR
This assumes you are using a clunk/filter like the Walbro felt one, which you should be doing....
AV8TOR
11-26-2011 | 10:38 AM
#17
My Feedback: (59)
RE: Three line fuel system
ORIGINAL: Ed
" Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now? "
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
" Is there any problem with using a tee in the fuel feed line on a two line system to fill thru as I am now? "
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it. Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
ORIGINAL: av8tor1977
Besides the reasons stated in favor of a three line tank, such as less possible leak points and not introducing air into the line going to the carb when re-fueling, there is another reason I like three line systems. With a two line fuel system, you are putting the fuel in before the tank clunk/filter, and can introduce crud into the fuel line and between the filter and the carb. Any crud that gets pumped will actually be trapped on the wrong side of the clunk/filter, and will go straight to the carb when the engine is run. With a three line system, the clunk/filer and line to the carb remain closed, and all fuel is filtered before it goes to the carb.
This assumes you are using a clunk/filter like the Walbro felt one, which you should be doing....
AV8TOR
Besides the reasons stated in favor of a three line tank, such as less possible leak points and not introducing air into the line going to the carb when re-fueling, there is another reason I like three line systems. With a two line fuel system, you are putting the fuel in before the tank clunk/filter, and can introduce crud into the fuel line and between the filter and the carb. Any crud that gets pumped will actually be trapped on the wrong side of the clunk/filter, and will go straight to the carb when the engine is run. With a three line system, the clunk/filer and line to the carb remain closed, and all fuel is filtered before it goes to the carb.
This assumes you are using a clunk/filter like the Walbro felt one, which you should be doing....
AV8TOR
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11-26-2011 | 11:27 AM
#19
My Feedback: (19)
RE: Three line fuel system
ORIGINAL: TheRickster
Been using the ''T'' for as long as I can remember with no issues.. Simply a personal preference...
Rick
Been using the ''T'' for as long as I can remember with no issues.. Simply a personal preference...
Rick
Two line and three line fuel systems are a subject like oil and what brand of radio is best. There will always be different opinions with as many supporting reasons for the system that is chosen by the user.
I'm a 2 line guy, have never had a problem with a "T" leaking and I don't get crud in my carb screens as the fuel going into the system is well filtered.
11-26-2011 | 11:56 AM
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From: Bend,
OR
RE: Three line fuel system
If gassers don't need or use the pressure system then even on a two-line system, what do you use the second line for? Just a vent?
Sorry, I'm brand new to gas.
Andy
Sorry, I'm brand new to gas.
Andy
11-26-2011 | 12:00 PM
#23
RE: Three line fuel system
ORIGINAL: Truckracer
+1
Two line and three line fuel systems are a subject like oil and what brand of radio is best. There will always be different opinions with as many supporting reasons for the system that is chosen by the user.
I'm a 2 line guy, have never had a problem with a "T" leaking and I don't get crud in my carb screens as the fuel going into the system is well filtered.
ORIGINAL: TheRickster
Been using the ''T'' for as long as I can remember with no issues.. Simply a personal preference...
Rick
Been using the ''T'' for as long as I can remember with no issues.. Simply a personal preference...
Rick
Two line and three line fuel systems are a subject like oil and what brand of radio is best. There will always be different opinions with as many supporting reasons for the system that is chosen by the user.
I'm a 2 line guy, have never had a problem with a "T" leaking and I don't get crud in my carb screens as the fuel going into the system is well filtered.
11-26-2011 | 12:04 PM
#24
RE: Three line fuel system
ORIGINAL: oldtyme
If gassers don't need or use the pressure system then even on a two-line system, what do you use the second line for? Just a vent?
Sorry, I'm brand new to gas.
Andy
If gassers don't need or use the pressure system then even on a two-line system, what do you use the second line for? Just a vent?
Sorry, I'm brand new to gas.
Andy
