I have a SS gas tank that has a 5/16" line at the top right side of the tank. I want to put a breather on the line, like a charcoal filter so I wont smell the fumes and it will act as a vent also. Does anyone have this type setup and what kinda filter did you use. I have seen where they adapted a valve cover breather to the line. Anyone have a recommediation???

Out of all the SS tanks nobody has a vent on them or have gas fumes in there garage?

Mike,

I just got my stainless tank a couple of weeks ago and was wondering the same thing. I found some info on Protouring.com/ any thing from a hose to a sintered bronze fitting to running vacuum from the engine and running the vented line to a charcoal canister.
http://www.pro-touring.com/forum/forumdisplay.php?f=31 Use this link and search the for "vent"

That vent is to small for most applications anyway. I'm running a 1/2 fuel hose to a K&N. It works well except at full tank. I'm going to be plumbing in a air fluid seperator and place it in the trunk with another line back outside the trunk with a K&N.

I'm using a '68 vented gas cap, so I just capped the vent line on my stainless tank.

If you use the vent line, you need a CHECK VALVE. The vent is only there to let AIR IN. It should NOT let anything OUT.

And yes, you SHOULD get a big whoosh of pressure escaping when you remove your fuel cap on a warm day.

Completely disagree with you. Fuel that the engine consumes must be replaced by air. (That's why the pressure builds and causes your whoosh) In a high performance application your vent should be equal to your feed line otherwise you can create a vacuum(Whoosh) and stand the chance of a vapor lock. When the car heats up or sits in the sun gas will expand and it should also be able to vent which is probably what your 68 fuel cap allows.

My buddy did some research on the gas tank vent issue. Its his car. His concern is that some tanks have over pressured. That is why we want to put a vent on it. To keep the pressure out of it.

Another thing is I have a fuel cell in my camaro and you can smell gas sometimes in my garage. We are trying to eliminate that also. Not just plug the piece of tubing.

Has anyone else read about over pressure in the SS gas tank.

Also thanks for all the ideas.

I don't get the gas smell unless it's really hot. New cars smell like gas when they purge as well.

Has anyone came up with any other ideas, I have been fighting this for a few weeks.

I am running a 383 Vortech Supercharged engine in my 72 Camaro, An Aeromotive electric pump, boost referanced regulator, and a return line. Factory tank sumped, 1/2 inch fuel lines, and I am having venting problems.

They do not make a vented cap for a second gen. I ran 1 vent line from the drivers side of the top of the tank, and put a rear end breather in the line, and zip tied it upward. on a 30 mile drive, 80 degree temp I started getting vapor lock. I replaced the filter, and added another vent line on the passenger side. I coiled both 3/8th fuel lines 3 times and zipped tied them together to stop spillage. Well I just took the car out on a drive and I think I found some horsepower (probably the filter change) but I filled the tank and when I backed in the garage it puked some (1/4 cup) fuel on the garage floor.. no good.

I am not getting a "whooshing" sound when I remove the cap, and I think the 2 vent set up is working, but does anyone have any ideas how to stop the fuel escape? I have 3" dual exhaust, and Air Ride so space is limited around the tank area. My engine bay is all custom so I do not want to add a charcoal canister.. I was thinking of installing a coolent style surge tank and vent the top, and drain the tank periodically, but I would still have to add items to my engine bay, so I want avoid messing up the sano look if possible.

Any suggestions is greatly appreciated. Thank you

I bought a charcoal canister for a K car off ebay for $15 and put it in the trunk. JB-Welded an elbow in the filler neck, went up to the canister, then back down out of the trunk with a cheap inline fuel filter on the end to act like an air filter just in case. It could be cleaned up some but I've never been one to chose form over function which is a churched up way of saying I'm lazy.



http://farm3.static.flickr.com/2492/4158166096_66ebef16eb.jpg

http://farm3.static.flickr.com/2528/4158166140_204427807e.jpg

Thank you, did it eliminate all the fumes? Do you ever get fuel in the cansiter? The pics are great

No fumes in the garage other than normal exhaust fumes from starting it up or pulling it in. If I leave it sitting for a week the garage doesn't smell like gas.

Gas would have to work pretty hard to make it up into the canister. With a full tank it sloshes against the cap of course but I don't think it can make it up the hose. If it could I don't think it would be able to pool in the canister which is why I mounted it with the nipples down. I would've liked to have hidden it under the car but didn't want to tap into the tank and couldn't get the elevation I wanted in order to not worry about gas getting in it.

I redesigned my system about 8 months ago and it works great. I vented the tank through a bulkhead in the trunk to a 1 qt canister. Then I vented the canister back out the trunk into a K&N filter from the top of the canister. You don't want loops in the vent hose. It doesn't work I don't car what anybody says. Fuel gets trapped in the loops and then pressure builds and it belches on the ground when you shut the car down and the fuel quits being deminished by the engine. Here are some photos.
http://i200.photobucket.com/albums/aa251/Payback1969/FuelVent001.jpg
http://i200.photobucket.com/albums/aa251/Payback1969/FuelVent009.jpg