Running the vent line properly?

Whizbang · 03-24-2009, 04:35 PM

Well i have no charcoal canister and no tip valve on the car anymore. Right now i have the vent line capped. But this is going to cause some serious vacuum issues. But where can i run the vent line? Just up somewhere? Then what you make good tip valve? Summit sells a few at around 11 dollars.

djmtsu · 03-24-2009, 06:10 PM

I don't remember how I have mine on my FC.

Any I don't know what a 'tip' valve. Does it help to make the car not stink like gas? If so, I definitely do NOT have one!! lol

Whizbang · 03-24-2009, 06:21 PM

in the event of a roll over, gas wont go everywhere via the vent line.

rx7carl · 03-24-2009, 09:58 PM

No the tip valve as you call it is on the fuel feed line to the pump. The one on the vent line is the check and cut valve. It also may have rollover protection though I cant remember. The check/ cut valve must be working or you will have fuel problems. Its designed to limit pressure differential from the tank to atmosphere. If the tank gets warm and builds pressure up, it vents it. Also as you drive and the fuel level drops it lets in air so the tank pressure doesnt drop. You could route it to the air cleaner, or put some sort of mini filter on the end of it. But yes do NOT cap it off.

FWIW, when you open the fuel cap and hear a whoosh of air, that means the vent system is not functioning properly.

djmtsu · 03-25-2009, 07:08 AM

Quote:

Originally Posted by rx7carl

FWIW, when you open the fuel cap and hear a whoosh of air, that means the vent system is not functioning properly.

But I like that sound.

Reminds me on the old 'Busch' commercials.

mmm beer.

rx7carl · 03-25-2009, 09:45 PM

Quote:

Originally Posted by Low Impedance

since i dont have any of the items under there, what you you recommend? Track down a replacement cut valve?

So your valve and stuff is gone? You could try to find a replacement. One simple idea is to drill a small hole in your gas cap to act as a vent. Then cap the vent port at the tank. That whole system is really just made to comply with EPA pollution standards. Older cars just had vented gas caps.

Quote:

Originally Posted by djmtsu

But I like that sound.

Reminds me on the old 'Busch' commercials.

mmm beer.

:beer:

Whizbang · 03-24-2009, 11:13 PM

since i dont have any of the items under there, what you you recommend? Track down a replacement cut valve?

RX-7 Chris · 03-25-2009, 08:59 AM

you are probably going to want to find a replacement cut valve.

I had problems with mine building pressure and it used to take forever to pump the gas. turned out to be the valve in backwards.

If you do not have the charcoal canister, you will probably want some kind of charcoal filter. Or maybe you can find a car with a real small canister. Charcoal is going to do the best to get rid of the gas smell.

Whizbang · 03-25-2009, 10:13 AM

the smell doesn't bother me really. Could i just run a standard vent line up and call it a day?

RX-7 Chris · 03-25-2009, 10:35 AM

you really need some kind of filter or run it into the carb so you don't give the gas funes any way to ignite.

Whizbang · 03-25-2009, 11:03 AM

i might be able to find a small charcoal canister and mount it up in the rear

RX-7 Chris · 03-25-2009, 11:34 AM

That would probably work fine if you can mount is so it is higher than the tank.

Whizbang · 04-03-2009, 04:00 PM

think im going to just drill the gas cap and see how it works out.

Twilightoptics · 04-24-2009, 11:01 PM

Most guys that ditch the charcoal cansiter run the vent from the tank to the air cleaner, or put a small filter on the end of the line. I've also seen guys run them open with no problems, but I haven't seen them roll over either!

Whizbang · 04-25-2009, 12:06 AM

drilled gas cap has been working quite well!

03-24-2009, 04:35 PM	#1
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Running the vent line properly? Well i have no charcoal canister and no tip valve on the car anymore. Right now i have the vent line capped. But this is going to cause some serious vacuum issues. But where can i run the vent line? Just up somewhere? Then what you make good tip valve? Summit sells a few at around 11 dollars. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

03-24-2009, 06:10 PM	#2
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	I don't remember how I have mine on my FC. Any I don't know what a 'tip' valve. Does it help to make the car not stink like gas? If so, I definitely do NOT have one!! lol __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

03-24-2009, 06:21 PM	#3
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	in the event of a roll over, gas wont go everywhere via the vent line. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

03-24-2009, 09:58 PM	#4
rx7carl Rotary Fan in Training Join Date: Mar 2008 Location: Orlando, Fl iTrader: (0) Posts: 59 Rep Power: 17	No the tip valve as you call it is on the fuel feed line to the pump. The one on the vent line is the check and cut valve. It also may have rollover protection though I cant remember. The check/ cut valve must be working or you will have fuel problems. Its designed to limit pressure differential from the tank to atmosphere. If the tank gets warm and builds pressure up, it vents it. Also as you drive and the fuel level drops it lets in air so the tank pressure doesnt drop. You could route it to the air cleaner, or put some sort of mini filter on the end of it. But yes do NOT cap it off. FWIW, when you open the fuel cap and hear a whoosh of air, that means the vent system is not functioning properly. __________________ www.pbandjracing.com

03-24-2009, 11:13 PM	#7
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	since i dont have any of the items under there, what you you recommend? Track down a replacement cut valve? __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

03-25-2009, 08:59 AM	#8
RX-7 Chris Rotary Fanatic Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (2) Posts: 132 Rep Power: 17	you are probably going to want to find a replacement cut valve. I had problems with mine building pressure and it used to take forever to pump the gas. turned out to be the valve in backwards. If you do not have the charcoal canister, you will probably want some kind of charcoal filter. Or maybe you can find a car with a real small canister. Charcoal is going to do the best to get rid of the gas smell.

03-25-2009, 10:13 AM	#9
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	the smell doesn't bother me really. Could i just run a standard vent line up and call it a day? __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

03-25-2009, 10:35 AM	#10
RX-7 Chris Rotary Fanatic Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (2) Posts: 132 Rep Power: 17	you really need some kind of filter or run it into the carb so you don't give the gas funes any way to ignite.

03-25-2009, 11:03 AM	#11
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	i might be able to find a small charcoal canister and mount it up in the rear __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

03-25-2009, 11:34 AM	#12
RX-7 Chris Rotary Fanatic Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (2) Posts: 132 Rep Power: 17	That would probably work fine if you can mount is so it is higher than the tank.

04-03-2009, 04:00 PM	#13
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	think im going to just drill the gas cap and see how it works out. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

04-24-2009, 11:01 PM	#14
Twilightoptics Itchin' to Turbo Join Date: Apr 2009 Location: Vancouver, WA iTrader: (0) Posts: 33 Rep Power: 0	Most guys that ditch the charcoal cansiter run the vent from the tank to the air cleaner, or put a small filter on the end of the line. I've also seen guys run them open with no problems, but I haven't seen them roll over either!

04-25-2009, 12:06 AM	#15
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	drilled gas cap has been working quite well! __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook