Fuel tank venting Options

[FJ1200]

Morning,

I think its finally time to address the fuel smell on my 72. I pulled the tank last night and it looks like the tank was probably replaced at some point as it is near perfect. I ordered new stainless tunnel lines from Chris Foley as well as new hoses and clamps for both ends. My question is venting. There is literally no hoses left in the frunk. It looks like the 3mm lines should all tee together and tie to the charcoal canister. So 2 ports on the expansion tank, 1 port on the filler neck and the then the canister. Is this right? If so then I should need 2 tee's. The overflow hose looks like it is currently NA, 914 rubber is out of stock as are other vendors. Has anyone used 3/4" clear poly tubing in its place? Lastly after I hookup the canister does anyone offer a clean looking solution to tie the suction side into IDF air filters?

Thanks.

[FJ1200]

Forgot to mention, if anyone has a picture of how the 3mm lines are laid out on a 1972 from the factory it would be a huge help.

Thanks,

[Steve]

Just depends on if you want the factory setup or something similar to the later 75-76 setup with the charcoal canister in the engine compartment. On my 72 and 75, I used the stock expansion chamber and ran one hose back to the engine compartment to the charcoal canister. Versus the early setup with the charcoal canister on the tank, you have to run two lines back to the engine compartment.
http://www.914world.com/bbs2/index.php?showtopic=108524

[FJ1200]

So the PET is misleading, looks like the breather on the filler goes straight to the port on the bottom of the expansion tank. Then another line from the side of the expansion tank to the canister. I am more tempted to keep the canister in the frunk out of ease. If I had to guess find the factory bracket to mount it in the engine compartment is near impossible.

What about tying into the weber air filters? Anyone have a clean looking solution?

Thanks,

[r_towle]

the pipes or tubes go down the drivers side behind the rocker cover.
the charcoal canister gets mounted to the top of the tank in a 72, so it stays up front.

The overflow tube sadly just goes out the bottom of the car right next to the large hole to access the tank fittings on the bottom....you will see a 3/4 round hole. It vents to the atmosphere.

You will need to find some enclosed air filter covers to feed the fumes into the carbs...never seen that done.

If you are dealing with a smell in the garage, and all the lines are new and not leaking...I suggest you get a fuel shutoff valve, then once you park the car, let it idle until it dies. This removes the fuel from the carb bowls, it helps prevent solids from building up in the carbs.

Sadly, with the amount of ethanol in the fuel now, it evaporates very quickly, and smells up the garage a lot more as a result.

[FJ1200]

r towle

Everything you say makes sense, i agree with newer ethanol fuel evaporating at a higher rate than real 100% gas. I am hoping by replacing all lines and hooking the system up as designed I can greatly minimize the smell. What drove this is the tank -> line hoses were degraded creating a horrible smell while driving.

Just found CSP makes some nice aluminum filters housings that have cast boss that is threaded for a breather. I think it would be pretty clean to use banjo fittings and run evap to passenger side and crankcase to the drivers side. All of the fitting are available from Belmetric, adds up in money. Buy once cry once.

Dan

[mgphoto]

I did this years ago and no trouble since.

http://www.914world.com/bbs2/index.php?sho...=117213&hl=

[914sgofast2]

Are you sure the gas tank does not have surface rust bubbles on the outside of the gas tank where it rests on the felt cushions the factory put on the body? The felt cushions trap moisture and over time it rusts holes into the gas tank and yo then start to smell gas in the passenger cabin whenever you have a half full or higher tank.

As others have stated, there are two larger hoses of 1/2" diameter than run from opposite ends of the charcoal canister on top of the gas tank back to the engine compartment. One of those hoses connects to a 1/2" outlet on the engine cooling fan housing on the passenger side of the car. The other of those hoses is connected to the 1/2" outlet on the engine's air filter housing.

There are 2 small vacuum hoses at the gas tank. (1) One small vacuum line runs from the vapor holding tank (on top of the gas tank) to the small outlet in the end of the charcoal canister. (2) On the bottom side of that same vapor recovery tank is another small pipe outlet where a small vacuum hose connects to the filler neck assembly which has a small outlet on the back side of the neck.

There is also a 1/2" clear vinyl hose which connects to the square "funnel" piece on top of the gas tank which has the gas cap. That 1/2" diameter outlet's vinyl hose runs down the side of the gas tank to an approximately 3/4"diameter hole in the body under the gas tank to drain any excess gas spilled during refueling onto the ground.

[FJ1200]

@914sgofast2

Everything you posted seems rights. There is minimal surface rust at the 4 points that contact the felt pads. I gave them a quick rub with a scotch brite and the steel is solid.

I think I have my answers, I need to put in an order with Belmetric and Autoatlanta and I think I'll have everything I need to put the system into a functional condition.

Thanks everyone,

[Quinn Moore]

@914sgofast2

Everything you posted seems rights. There is minimal surface rust at the 4 points that contact the felt pads. I gave them a quick rub with a scotch brite and the steel is solid.

I think I have my answers, I need to put in an order with Belmetric and Autoatlanta and I think I'll have everything I need to put the system into a functional condition.

Thanks everyone,

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together.

Thanks,

QM

[ClayPerrine]

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together.

Thanks,

QM

Quinn,
It depends on the year. Pre 74 had big lines that ran under the left rocker panel and the canister was mounted to the top of the fuel tank. Somewhere in 74 they moved the canister into the engine compartment and ran a small vacuum line in parallel with the fuel lines to connect it to the tank.

Finding the early lines requires finding someone parting out an early car. The later ones can be done with hard plastic vacuum line you can get at FLAPS.

Hope that helps.
Clay

[Quinn Moore]

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together.

Thanks,

QM

Quinn,
It depends on the year. Pre 74 had big lines that ran under the left rocker panel and the canister was mounted to the top of the fuel tank. Somewhere in 74 they moved the canister into the engine compartment and ran a small vacuum line in parallel with the fuel lines to connect it to the tank.

Finding the early lines requires finding someone parting out an early car. The later ones can be done with hard plastic vacuum line you can get at FLAPS.


Hope that helps.
Clay

Thanks Clay, '73. Need the big ones. May move it to the engine compartment if I can't locate some correct lines. Search continues.

Much appreciated

QM

[ClayPerrine]

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together.

Thanks,

QM

Quinn,
It depends on the year. Pre 74 had big lines that ran under the left rocker panel and the canister was mounted to the top of the fuel tank. Somewhere in 74 they moved the canister into the engine compartment and ran a small vacuum line in parallel with the fuel lines to connect it to the tank.

Finding the early lines requires finding someone parting out an early car. The later ones can be done with hard plastic vacuum line you can get at FLAPS.


Hope that helps.
Clay

Thanks Clay, '73. Need the big ones. May move it to the engine compartment if I can't locate some correct lines. Search continues.

Much appreciated

QM

There should be holes for them on the inside of the left front fender, and in the engine compartment lower left front corner. They are not one piece, they are multiple pieces, and grommets for all the body pass through points.

From PET:



Hope that helps!

[JamesM]

Morning,

I think its finally time to address the fuel smell on my 72. I pulled the tank last night and it looks like the tank was probably replaced at some point as it is near perfect. I ordered new stainless tunnel lines from Chris Foley as well as new hoses and clamps for both ends. My question is venting. There is literally no hoses left in the frunk. It looks like the 3mm lines should all tee together and tie to the charcoal canister. So 2 ports on the expansion tank, 1 port on the filler neck and the then the canister. Is this right? If so then I should need 2 tee's. The overflow hose looks like it is currently NA, 914 rubber is out of stock as are other vendors. Has anyone used 3/4" clear poly tubing in its place? Lastly after I hookup the canister does anyone offer a clean looking solution to tie the suction side into IDF air filters?

Thanks.

If your goal is just to get rid of the smell, you may be able to get by hooking the vent line from the fuel filler to a long 3mm line and running it inside the overfill hose out the bottom of the car. Just make sure that both the overfill hose and the vent line exit the hole in the floor and are not just sitting under the tank.

Otherwise, hooking the expansion tank and charcoal canister up as designed, cap the side of the canister that the fuel vent line enters and run the remaining line from the charcoal canister out the hole in the fender. No need to have the blow through actually working it just needs to not be venting into the trunk to get rid of the smell.

[Quinn Moore]

Morning,

I think its finally time to address the fuel smell on my 72. I pulled the tank last night and it looks like the tank was probably replaced at some point as it is near perfect. I ordered new stainless tunnel lines from Chris Foley as well as new hoses and clamps for both ends. My question is venting. There is literally no hoses left in the frunk. It looks like the 3mm lines should all tee together and tie to the charcoal canister. So 2 ports on the expansion tank, 1 port on the filler neck and the then the canister. Is this right? If so then I should need 2 tee's. The overflow hose looks like it is currently NA, 914 rubber is out of stock as are other vendors. Has anyone used 3/4" clear poly tubing in its place? Lastly after I hookup the canister does anyone offer a clean looking solution to tie the suction side into IDF air filters?

Thanks.

If your goal is just to get rid of the smell, you may be able to get by hooking the vent line from the fuel filler to a long 3mm line and running it inside the overfill hose out the bottom of the car. Just make sure that both the overfill hose and the vent line exit the hole in the floor and are not just sitting under the tank.

Otherwise, hooking the expansion tank and charcoal canister up as designed, cap the side of the canister that the fuel vent line enters and run the remaining line from the charcoal canister out the hole in the fender. No need to have the blow through actually working it just needs to not be venting into the trunk to get rid of the smell.

Thanks James (and Clay), that worked well, that being, run the hose down the overflow. I'll still work on getting the canister hooked up correctly, but this is good in the meantime.

Much appreciated, everyone.

QM

[914werke]

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together. Thanks, QM

Ive got plenty of the early OE vent lines. (IMG:style_emoticons/default/smile.gif)

[Quinn Moore]

I realize this is an older post. I've been searching everywhere for correct vent lines. Thought I'd ask if you were able to get the hoses/lines from somewhere? If so, where? PO didn't reinstall the cannister or any lines. So I've been trying to get it back together. Thanks, QM

Ive got plenty of the early OE vent lines. (IMG:style_emoticons/default/smile.gif)

pm sent. (have a couple questions).

thanks,

QM

[willieg]

Morning,

I think its finally time to address the fuel smell on my 72. I pulled the tank last night and it looks like the tank was probably replaced at some point as it is near perfect. I ordered new stainless tunnel lines from Chris Foley as well as new hoses and clamps for both ends. My question is venting. There is literally no hoses left in the frunk. It looks like the 3mm lines should all tee together and tie to the charcoal canister. So 2 ports on the expansion tank, 1 port on the filler neck and the then the canister. Is this right? If so then I should need 2 tee's. The overflow hose looks like it is currently NA, 914 rubber is out of stock as are other vendors. Has anyone used 3/4" clear poly tubing in its place? Lastly after I hookup the canister does anyone offer a clean looking solution to tie the suction side into IDF air filters?

Thanks.

When I bought my 914, there was a single 3 mm hose coming from the expansion tank and terminating, open ended, in the frunk. So, I knew where the gas smell was coming from. I build a charcoal canister, filled it with small charcoal pellets and connected the canister to the 3 mm hose coming from the expansion tank. I located the canister next to the expansion tank. I purchased 3/8” aluminum tubing from Summit Racing and ran the tubing from the charcoal canister through the drivers rocker panel to the intake on my Subie engine. Much, much less gas smell although still faint gas smell.