My zx14 2008 has two pipes at the back of tank. The one I bought to replace it is a zx14 2006 which has one pipe at the back.
The pipe on the left is a overflow gas/ water pipe? The one on the right would of been a tank vent pipe?

The 2006 tank without the vent pipe would vent from the cap I presume?

Am I right thinking this? If so I can just disregard my right hand rubber pipe on my bike?

Thanks in advance

Keep both pipes open. Why?
1. Weather/overflow pipe will rust inside and send water into the tank--so it remains open for that [dry] reason.
2. Tank vent pipe remains open so hose it down to the ground and away from the muffler. A full tank of gas might slosh and enter the pipe and drain out of it. The reason for the hosed pipe is to drain it away from the bike, plus it's the vent when the bike sits not running for one. If you close it, the tank will expand one way and implode [vapor lock] the other--via gas cap design.
3. Gas cap has a spring and ball times 2. One side is a spring at the key side and a ball at the opposite end. The other side is ball at the key side and spring at the bottom.
a. Ball at key side is vacuum will be sucked from fuel loss, and the air enters the tank by the ball dropping [by negative pressure] and the air neutralizes to 14.7psi again.
b. Spring at the key side is where the ball lifts up and the expansion in the tank forces the ball off its seat, the air exits out the tank pipe.
c. Lift up gas cap, see how the black housing, houses the ball/spring sort of mirror each other?
d. Also, see the weather/overflow hole outside the tank filler neck? That's the pipe for the weather/o-flow.
e. Find the nipple at the gas cap. Follow the nipple as you close the gas cap. See that hole in the tank and a rubber seal-ring heading into that pipe hole? That's the other end of the vent pipe.

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The point I’m trying to make is the 2006 tanks over here have only one nipple at the back, so the tank cap will itself do the venting, and the two pipes on my bike the only one I will be using is the over flow one, if that makes sense?

Seems to me the overflow drain tube would have no problem also venting vapors.

The cap should vent vapors without a drain tube, the vapors just go into the ring and float out. If any liquid from the vent in the cap condenses in the gas cap recess, there is a second hole in the floor of the recess to drain water or any liquid that gets under the gas cap.

I have an aftermarket gas cap on my 08 US model. It only vents through the filler neck. There is no overflow hole. If the gasoline expands enough, it will come out of the vent in the filler neck and run down the two holes in the floor of the recess.

To me, this is a bit of a paint damage risk since gasoline could sit in the recess. Just don't overfill the tank and I think you'll be fine.

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Seems to me the overflow drain tube would have no problem also venting vapors.

Weather/overflow can't vent vapor. That gas cap has a rubber seal over the filler neck. Any escaped vapor is going to vent out and around the beauty ring, as would water enter the same way. So if that weather tube would vent, here comes the water and/or water vapor into the tank and rust assured, use is going to fuccup the fuel pump with rust remains rotting the ceiling anshit.

If say I walk up to any gen gas tank, read the number of tubes at the back of the tank:
1. Single tube at back of tank = Not counting the weather tube... New evap control system. This is the overfilled vent tube heading into a charcoal canister and evaps out #4 throttle body vac tube.

2. Double tubes at back of tank = Not counting the weather tube... Conventional evap control system. This uses 3-4 throttle body vac tubes. Middle tube has vapor/liquid exit tank. Enters a separator via a pump pulses off the the vacuum of(3) throttle body. Gas-returns to far right tube. Vapor exits out to (4) throttle body's vacuum.

Cali/other style Tanks w/nipple recess = Find the nipple hole at tank filler neck. Use cali gas caps. Or run a race gas cap on any tank.
A Good Sign--reading the gas cap = Dual balls can keep the pressure in so that whoosh out the cap when keyfobbed is turned, we are not at 14.7 pounds to lift ball, but the whoosh was that building of pre-pressure.
I blow in each tube and find where the other end is and decipher who is whom. I then finger close the hole, blow into the tube again so the tube is not split so I have pressure present.

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My replacement tank has one "weather" tube out the back on the left hand side, no other tubes at the back, my 2008 tank originally on the bike has two tubes out of the back of tank. one on the left one on the right. My replacement tank therefore must vent through filler cap?
If i connect my hose to weather tube I will still have a hose with no where to connect to !!

Early UK tanks only have one outlet tube. 2008 onwards have two, hence thats why I will have a hose hanging free

* Last updated by: dave350v8 on 1/24/2019 @ 11:33 AM *

The weather tube expels water that might end up under the ring.

Any gasoline that ends up outside of the tank and in the ring recess will also drain through this hose.

The vapors must vent out the cap through a hole in the filler neck.

The old tank has one hose to handle water and gas both. should work fine.

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Ok understand that, so do I blank off spare hose on my bike now?

Sounds like the gas cap is the vent inside, thus the spring/ball configuration.
No, do not cap off single tube. UKnow it rains there a lot so the beauty ring will let the water fill up the neck an when you fob the gas cap the rain water is going to enter the tank... So do not close off the hose, run a rain hose down to the ground via the other hoses by the shift lever area.

* Last updated by: Hub on 1/24/2019 @ 5:27 PM *

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Ok understand that, so do I blank off spare hose on my bike now?

If I'm following this, you now will be using an 06 tank which has only one nipple but you have two hoses because you started off with an 08 tank with two nipples.

So if there are still the two hoses hanging at the back of the tank, hook up either one to the single nipple on the 06 tank. Both hoses should rout down to the front of the shift lever as Hub said. Either hose will do the same job for whatever it is that comes out of the nipple be it vapor, gasoline or water or all three.

If there is no second nipple to hook your second hose to, slide that hose out and store it with your spare parts. Otherwise, tape it up to the fuel tank mount so it does not fall out and I guess you could block off the tip up there with some tape or a golf tee or something. It's not doing anything just hanging there.

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Spot on Rook, is was hard to explain in writing

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I have the opposite issue of what is listed above. I currently have the single Nipple tank and it’s leaking so I just purchased the one that has 3 nipples Cali tank. Can I just hook a hose between the 2 pipes That would hook up to the evaporative recycler (aka flux capaciter) on the brake side. I’m thinking that would be like bypassing those 2 nipples by hooking them together, or is there any known reason why that might not work?

Sit on bike. Nipple to the left is overfill/rain/wash drain under the gas cap. Middle tube is put to atmosphere as the far right nipple. I have a 2 nipple 48 state. The rain drain is hosed to the bottom. The atmo nipple is hosed up the back rail and open.

Y-fitting to hook up both right side hoses will work

* Last updated by: Hub on 10/20/2022 @ 8:53 PM *

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So basically ypipe those 2 nipples back away from the engine away from the heat source that is the engine or pipe? Zip tie it to the rail that runs the length of bike under the seat opposite side of the pipe?

Basically that's one route of the hose. The other way to lace it is down past the rear of the engine. But then again, something drains, it's at the back of the tire, and the sudden slide or spin up of the rear wheel. That's why I send it uphill. I have a vacuum lock, it would suck the gas back in. Less debris under the seat than at the bottom of the engine.

OR, you can use one of the right side nipples, close the the other one. Both sort of wind up at the 'aka,' so you might want to close off the one throttle body hose routing that pills vapor from the flux capacitor via the vacuum suck of maybe #3's body's nipple source.

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I think I’m just gonna just hose them to each other blocking those 2 extra ports off. The tank already has a separate hose to vent through the top of the tank just like the non Cali version. This would make it identical to my old tank just adding this small piece of hose.