Issue with POOGS and finding Gas Tank Vent Tube Entrance - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 21 (permalink) Old 04-08-2011, 01:34 AM Thread Starter
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Question Issue with POOGS and finding Gas Tank Vent Tube Entrance

I am having an issue with POOGS and finding Gas Tank Vent Tube Entrance.

I was following this thread:

https://www.vn750.com/forum/showthread.php?t=17572

...but for the life of me, I cannot locate the Gas Tank Vent Tube Entrance, which is supposedly here:

Quote:
Locate the gas tank vent tube entrance; a small hole located on the gas tank directly in front of the opened gas cap hinge.
Here are some images of my gas cap, both on and off:










Help please?

.
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1989 Kawasaki Vulcan 750

Upgrades so Far:
Coastered
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LED Tail Light
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post #2 of 21 (permalink) Old 04-08-2011, 09:01 AM
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Yours is missing! Is there a vent hose coming off the bottom of the tank?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
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Currently 23,298 miles

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post #3 of 21 (permalink) Old 04-08-2011, 12:31 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
Yours is missing! Is there a vent hose coming off the bottom of the tank?
Where off the bottom of the tank would it be?

.
.
.
-Az
http://www.asbrand.com

1989 Kawasaki Vulcan 750

Upgrades so Far:
Coastered
R/R relocated
Analog Voltmeter
PFIII Windshield
RAM GPS Mount w/Garmin GPS
Cigarette Lighter Power Adapter
Saddlemen's Classic Explorer Seat
Pro-Tac Driver's Backrest
LED Tail Light
LED Rear Turn Signals
Luggage Rack
Storage Trunk
Engine Guard w/Highway Pegs
Radiator Grill Cover
Turn Signal Relocation Bracket
Saddlebags
Floorboards
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post #4 of 21 (permalink) Old 04-08-2011, 01:43 PM
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Near your meat and 2 veg when sitting on the bike . Like when you take off the seat to look at your battery. Should be the only hose visible down there. At least that is what I always thought that hose is.
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post #5 of 21 (permalink) Old 04-08-2011, 02:12 PM
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It is a short (perhaps 3/4" long), small diameter steel pipe sticking out the back of the tank just above the rear mounting bracket. You can see it in the first picture on this ebay auction.
http://cgi.ebay.com/ebaymotors/Kawas...item53e458b0a1

I believe tanks with two vent hoses are California models.

Some of the earliest models may not have any vent hoses.
They just vent through the cap somehow. Not 100 % sure how this works.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #6 of 21 (permalink) Old 04-08-2011, 03:51 PM
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Looks like it is missing to me too...unless someone filled it in and painted over it.

It should be right where the hole is on the hinge right between the mounting screws to the tank It looks like you have the correct gas cap for one.... but the hole is missing.

Is it possible someone replaaced the gas cap with a newer one at some point?

KM

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post #7 of 21 (permalink) Old 04-08-2011, 03:53 PM Thread Starter
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It is entirely possible someone did replace the gas cap in the past... I've no idea. I've not changed it since I got it.

Maybe the earlier models didn't have the vent tube?

Guess I'll be cleaning out the gas cap thingy listed in the original POOGS thread. See if that helps.

.
.
.
-Az
http://www.asbrand.com

1989 Kawasaki Vulcan 750

Upgrades so Far:
Coastered
R/R relocated
Analog Voltmeter
PFIII Windshield
RAM GPS Mount w/Garmin GPS
Cigarette Lighter Power Adapter
Saddlemen's Classic Explorer Seat
Pro-Tac Driver's Backrest
LED Tail Light
LED Rear Turn Signals
Luggage Rack
Storage Trunk
Engine Guard w/Highway Pegs
Radiator Grill Cover
Turn Signal Relocation Bracket
Saddlebags
Floorboards
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post #8 of 21 (permalink) Old 04-08-2011, 04:01 PM
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If you look at your last photo...you can see a small nipple thingy on the hinge that sits between the two philips screws on the cap...this fits down in the hole I mentioned before.

I believe early caps did not have this and it is possible your cap is trying to vent to the non exsistant hole. I don't know if that nipple thing is removable.

Will look at my VN tank and see if there is another solution.

KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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post #9 of 21 (permalink) Old 04-08-2011, 04:14 PM
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My original '86 tank was just like that. YES.....The early tanks did not have the internal vent tube!!! That is why I went with a newer model tank with the tube. When I filled up the tank on hot days under the awning at the gas station.....everything was fine. As soon as I would pull out from under the awning in the sun the sun's heat on my black gas tank would make the gas expand and go through the cap drain to the non existent tube and pour all over the top a side if the tank pouring on the hot engine. Your bet solution is to take the gas cap apart and clean all of your air passages really well with carb cleaner and a tooth brush. My bike eventually did what yours is doing and when you would park it, you would hear a faint whistling/squeeling sound coming from the gas cap. It was the pressure difference.....very slowly equalizing.
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post #10 of 21 (permalink) Old 04-08-2011, 04:23 PM
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First off....all tanks were prone to "whistling"... the issue was not a clogged or missing vent ..but just too tiny of a hole for expanding gasses to go through.


I looked at my VN750 tank and the nipple thing is not removable.. I am only guessing here that the early tanks without the vent did not have this, would need someone with an older non vented tank to take a photo....but...

I'd still take apart the cap and clean it. Perhaps you can grind the nipple off so the cap just vents to back of the hinge under the cap.........

KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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