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gas tank tube thingy

Larry_in_Tx

Larry_in_Tx

1/2 ton status
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Oct 24, 2002
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Location
Houston Tx.
The question was brought up in a thread in the garage about what the tube thingy mounted next to the gas filler neck is and what it does. I just figured it was a breather but when I pulled mine out the other day it was sealed up, no holes to let anything out. /forums/images/graemlins/confused.gif So what does this thing do? I’m thinking it may be something like a “shock absorber” plumbers put in water lines to hold pressure when the waters off so it won’t bump when you turn a faucet or something back on. There kind of built the same so it makes me think it’s something like that but I can’t figure how it would work on a gas tank. /forums/images/graemlins/thinking.gif

I’m at a loss. /forums/images/graemlins/dunno.gif /forums/images/graemlins/1zhelp.gif
 
Ya I haven't found a solid explination yet. I think of it as some kind of equalizer. Like when it gets real hot out and the gas is warm and wants to expand...?It may be also for like when you fill the tank to the top, even though your tank is totally full having that tube is like not having it totaly full. Like the air space that is left in the top of a beer bottle.??? I am totally guessing here.
Some one has to know the theroy behind this animal.
I have two lines going to mine. I'm thinking of useing one of them for my fuel return line so I can keep the factory vent line and still have one line going to the pipe???
Good question!
Anyone???????? /forums/images/graemlins/dunno.gif
 
I always thought it was a gas fume condensor. The charcoal can had a line going to it , and so does the tank. I think it traps the vapor and allows it to condense and fall back into the tank. Just my made up explanation. /forums/images/graemlins/rolleyes.gif
 
I don't think he is referring to the vent tube running alongside the main fill tube (which does allow the air to escape preventing backing up) /forums/images/graemlins/thinking.gif. If I'm not mistaken, he is referring to the vertical cylinder mounted inside the bed rail which has no vents --only 3 fuel line connections on the bottom.
 
Ya that pipe bomb looking thing.
So you guys think if I disconnect/plug one of thoes tubes off and use the inlet on the tank as a return line for my FI would be OK? But I guess we still don't know the theory behind this dude.
Comon Greg72 whip out that super brain of yours and give us an answer????? /forums/images/graemlins/1zhelp.gif
 
I think I remember Steve Chin having a good discription of what that thing does...too bad the search function won't go that far back /forums/images/graemlins/1zhelp.gif
 
[ QUOTE ]
I think I remember Steve Chin having a good discription of what that thing does...too bad the search function won't go that far back /forums/images/graemlins/1zhelp.gif

[/ QUOTE ]

NO KIDDING !!!!!!!!!!!!!!!!!!!!!!!! Much of the best info is too old to be searched for. It seems to be an unfortunate trend on this site. (lower quality w/ higher quantity of information).

/forums/images/graemlins/waytogo.gifAt least there are new forums like THE LOUNGE.....the CK5 version of Oprah. /forums/images/graemlins/waytogo.gif
 
I'm with ya!!!

We now have all these new forums but can't search back for any good info...what good is that /forums/images/graemlins/dunno.gif

I wonder if the reason you can't search for it is because it was all deleated to make room for the new forums /forums/images/graemlins/confused.gif
 
I found it Dan!
All I did was leave the number of months
I wanted to seach blank, no number. and
started scrolling thru, I used the word
Vent and then looked for SteveOs name...
and here it is....
"There shoul;d be a minimum of three vent lines.
One bigger one that goes to the top of the
filler neck,and two smaller ones that route from
either side of the fuel tank to the liquid/vapor
separator (the "tube thing" behind the filler neck).
The reason that there are two vent lines attached
to the liquid/vapor separator (I'll call it the
standpipe from here on out) is because a submerged
vent line does not vent well enough (it's basically hydrostatically locked). If the truck has a nearly
full tank and is tilted to one side, the opposite
vent tube is functional and will allow air into
the tank as the fuel pump pulls fuel out of the tank.

The charcoal canister is a pretty simple filtration
device that separates unwanted fuel vapors out of
the air that is expelled from the tank (and in
some models the carburetor). Those vapors are
collected for ingestion into the engine when
it is running. It does not a thing to hurt
performance and can help make a steel gas
tank and steel fuel lines last much longer
because it also filters moisture out of the
air that is vented into the tank."

/forums/images/graemlins/peace.gif /forums/images/graemlins/peace.gif /forums/images/graemlins/peace.gif /forums/images/graemlins/peace.gif /forums/images/graemlins/peace.gif
 
No Prob /forums/images/graemlins/thumb.gif
Have a GREAT Weekend!! /forums/images/graemlins/woot.gif /forums/images/graemlins/woot.gif /forums/images/graemlins/woot.gif
 
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