No vents on gas tank? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 (permalink) Old 10-19-2017, 10:35 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Laconia N.H.
Posts: 26
iTrader: (0)
 
Garage
No vents on gas tank?

Hello!

I found a gas tank that does not have vents. Is this common?

Thank you
Bill
Attached Thumbnails
Click image for larger version

Name:	IMG_0971.JPG
Views:	51
Size:	53.7 KB
ID:	41434  

Last edited by willyb99; 10-19-2017 at 11:13 PM.
willyb99 is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old 10-20-2017, 12:00 AM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,873
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
the vents should be under the fuel cap

Sent from my LGL34C using Tapatalk

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #3 of 19 (permalink) Old 10-20-2017, 12:55 AM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Laconia N.H.
Posts: 26
iTrader: (0)
 
Garage
OK, this tank doesn't have a cap. I am going to use the cap from the original tank. I guess what I really meant was the 2 emissions lines?

Also, does the black plastic cover over the fuel sender just pop off and there are screws holding the sender in?

Last edited by willyb99; 10-20-2017 at 12:59 AM.
willyb99 is offline  
 
post #4 of 19 (permalink) Old 10-20-2017, 02:52 AM
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
Tanks changed in the early 90’s. Before then there was no vent on the rear of the tank, just the cap...... unless it was a California model then it had two vents. Otherwise no vents until early 90’s where it had one vent from then on..... again unless it was a California model in which it still and always have had two.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.

Last edited by One1; 10-20-2017 at 03:09 AM.
One1 is offline  
post #5 of 19 (permalink) Old 10-20-2017, 03:17 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,011
iTrader: (0)
 
Garage
Quote:
Originally Posted by One1 View Post
Tanks changed in the early 90ís. Before then there was no vent on the rear of the tank, just the cap...... unless it was a California model then it had two vents. Otherwise no vents until early 90ís where it had one vent from then on..... again unless it was a California model in which it still and always have had two.
From what I can see the cap vents back down into an internal channel of the tank, presumably to the rear vent where the hose attaches. Did the pre-90's cap just vent to air at the top of the tank (and possibly vent fuel onto the rider)?

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is online now  
post #6 of 19 (permalink) Old 10-20-2017, 03:21 AM
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
I read a good page somewhere about the tank changes a couple yrs ago and I’ve been trying to find it for 30 mins now. Doesn’t look like I’ll dig it up anytime soon.

Edit: in fact even though i read that and saw pictures, don’t mark it down until i find that source again.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.

Last edited by One1; 10-20-2017 at 03:25 AM.
One1 is offline  
post #7 of 19 (permalink) Old 10-20-2017, 04:58 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Laconia N.H.
Posts: 26
iTrader: (0)
 
Garage
Well it seems that this is not the original tank. I think it is in good shape. I took the cap off my first tank and I see where the cap had the vent (a little pin type object). This tank has no such provision. It looks like I am going to have to find out what year tank it is and buy a cap. Or I could stab a hole in the top of the tank....which should work, but recommended.
Attached Thumbnails
Click image for larger version

Name:	novent.JPG
Views:	62
Size:	81.8 KB
ID:	41450   Click image for larger version

Name:	vent.JPG
Views:	60
Size:	81.6 KB
ID:	41458  
willyb99 is offline  
post #8 of 19 (permalink) Old 10-20-2017, 08:01 PM
Senior Member
 
cglennon's Avatar
 
Join Date: May 2008
Location: Portland, OR
Posts: 731
iTrader: (0)
 
Send a message via Skype™ to cglennon
Quote:
Originally Posted by willyb99 View Post
Hello!

I found a gas tank that does not have vents. Is this common?

Thank you
Bill

Model years '85-'87 vent through a small port in the base of the gas cap. The port exit is located in the rear of the gas cap.

Model years '88 - '06 vent through a tube that run through the gas tank exiting at the rear of the tank.


Chris Glennon - Portland, OR
cglennon is offline  
post #9 of 19 (permalink) Old 10-20-2017, 11:26 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Laconia N.H.
Posts: 26
iTrader: (0)
 
Garage
So the 2 "pipes" I have on my '86 tank are emissions only? The tank I have now does not have any type of pipe, nor a cap. So it is possible it is an early 90's tank? Is there any way I an use it?
willyb99 is offline  
post #10 of 19 (permalink) Old 10-21-2017, 04:43 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,011
iTrader: (0)
 
Garage
Saw on one post that the 85s had vent pipes. Hard to know what tanks got switched around, though, so it's hard to take anecdotal evidence as final. Seems more likely that 85-87 were all the same.

You can use the old tanks on new bikes, but you have to match the gas cap to the appropriate tank. You'd just rip out the now unused evap stuff from your frame and done (or you could leave it in-place and unused if you're feeling lazy). The late model vent hose to open-air has its equivalent in the gas-cap of the early models. Old way has more of a chance to purge pressurized gasoline/vapors onto the rider instead of being spat out onto the pavement via a hose.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is online now  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome