Fuel cap compatibility - 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 11 (permalink) Old 08-29-2019, 11:20 AM Thread Starter
Junior Member
 
warbike's Avatar
 
Join Date: Sep 2011
Posts: 22
iTrader: (0)
 
Fuel cap compatibility

My fuel tank has no vent hole between the fuel cap mount screw holes. After considering welding a quarter turn or threaded filler neck to the tank, which would be the cheaper option, I decided to just buy a cap assembly. Problem I have is that my tank doesn't have that vent hole between the mounting screw holes. Will the cap with the vent nipple still work for me? Or do I have the wrong fuel tank for this bike? Mounts perfectly but I haven't seen any vn750 tanks online that don't have the vent hole...

Sent from my moto z3 using Tapatalk
warbike is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 08-29-2019, 11:27 AM
Retired USAF (IYAAYAS)
 
Chris and Shim's Avatar
 
Join Date: Mar 2010
Location: Fredrickson Wa
Posts: 614
iTrader: (0)
 
Garage
Where did you get the tank? ALL Vn750 tanks have that "hole" which is actually a tube that exits at the back of the tank nearest you.

TOC MCCTs
Saddlebags, hard mounted
Fork mounted tool bag (now hard mounted)
Relocated rear turn signals
LED turn signals, brake lights and running lights
LED license plate frame
Engine Guard and Highway pegs
National Cycles Low Boy Heavy Duty windshield
Home made lowers (nice)
Custom seat (made by a local guy)
Iridium plugs (DPR7EIX-9)
Shenko 230 Tour Master tires at 11,123 miles
Splines lubed at 11,123 miles
Luggage rack
Light bar with LED lights
Chris and Shim is offline  
post #3 of 11 (permalink) Old 08-29-2019, 11:35 AM Thread Starter
Junior Member
 
warbike's Avatar
 
Join Date: Sep 2011
Posts: 22
iTrader: (0)
 
Came with the bike when it was given to me. Not the original I believe. Engine still had the California stuff on it so I think it's just a non California tank. Which makes sense, I was just looking at a few pictures again and realized that it was probably connected to those tubes, which I don't have either. Which makes me think that the cap assembly will work just fine.

Sent from my moto z3 using Tapatalk
warbike is offline  
 
post #4 of 11 (permalink) Old 08-29-2019, 12:15 PM
Senior Member
 
cglennon's Avatar
 
Join Date: May 2008
Location: Portland, OR
Posts: 733
iTrader: (0)
 
Send a message via Skype™ to cglennon
VN700 / VN750 model years 1985 - 1987 did not vent through the gas tank. They vented directly though the gas cap. You must have a '85 - '87 gas tank. A '88 or newer gas cap will fit, but you will need to modify the vent (e.g., cut the vent nipple or drill a vent in the back of the cap).


Chris Glennon - Portland, OR
cglennon is offline  
post #5 of 11 (permalink) Old 08-29-2019, 12:26 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,451
iTrader: (5)
 
Quote:
Originally Posted by cglennon View Post
VN700 / VN750 model years 1985 - 1987 did not vent through the gas tank. They vented directly though the gas cap. You must have a '85 - '87 gas tank. A '88 or newer gas cap will fit, but you will need to modify the vent (e.g., cut the vent nipple or drill a vent in the back of the cap).
thats one I didnt know..

what are we up to now? 3 differences over a 21 year production run?

2005 VN750

Sold 11-27-17
michiganteddybear is offline  
post #6 of 11 (permalink) Old 08-29-2019, 12:59 PM Thread Starter
Junior Member
 
warbike's Avatar
 
Join Date: Sep 2011
Posts: 22
iTrader: (0)
 
Quote:
Originally Posted by cglennon View Post
VN700 / VN750 model years 1985 - 1987 did not vent through the gas tank. They vented directly though the gas cap. You must have a '85 - '87 gas tank. A '88 or newer gas cap will fit, but you will need to modify the vent (e.g., cut the vent nipple or drill a vent in the back of the cap).
Nice, thanks for the info. Shouldn't be too hard to drill a hole and put in a grommet that will fit the nipple then.

Sent from my moto z3 using Tapatalk
warbike is offline  
post #7 of 11 (permalink) Old 08-29-2019, 01:31 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,634
iTrader: (4)
     
Garage
Quote:
Originally Posted by michiganteddybear View Post
thats one I didnt know..

what are we up to now? 3 differences over a 21 year production run?
Actually there is about a dozen small differences through the years. Petcock changed, master cylinder changed. Early bikes had aluminum parts like the backrest and seat rail, which oxidized in time, that were eventually chrome plated to avoid that. Speedo and tack upper "buckets" were eventually chromed too (2003).(they were painted, and prone to rust) Carb drain screws changed. As pointed out here, fuel caps changed.
Original model had black engine and black wheels. Seat changed from then too.
Not to mention paint graphics. There's a few more but these are the ones just off the top of my head...

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
Knifemaker is offline  
post #8 of 11 (permalink) Old 08-29-2019, 01:50 PM
Retired USAF (IYAAYAS)
 
Chris and Shim's Avatar
 
Join Date: Mar 2010
Location: Fredrickson Wa
Posts: 614
iTrader: (0)
 
Garage
Wow. Learn something everyday! I didn't know that either about the early model venting being different.

I stand corrected.

TOC MCCTs
Saddlebags, hard mounted
Fork mounted tool bag (now hard mounted)
Relocated rear turn signals
LED turn signals, brake lights and running lights
LED license plate frame
Engine Guard and Highway pegs
National Cycles Low Boy Heavy Duty windshield
Home made lowers (nice)
Custom seat (made by a local guy)
Iridium plugs (DPR7EIX-9)
Shenko 230 Tour Master tires at 11,123 miles
Splines lubed at 11,123 miles
Luggage rack
Light bar with LED lights
Chris and Shim is offline  
post #9 of 11 (permalink) Old 08-29-2019, 02:08 PM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,053
iTrader: (0)
 
Garage
The nipple/hole combo is designed to direct fuel away from the rider when there is an overflow due to overpressurization. The hole in later model tanks redirects that overflow through a tube in the tank, and out the back under the seat. The nipple/hole does NOT have a pressure/liquid-tight seal, since there is no pressure in the hole, so any liquid coming out of the nipple just runs unobstructed through the tube.

Adding a grommet back into the gas tank will not accommodate the engineered pressure regulator in the fuel cap, and will likely lead to leaking sloshing fuel out of the gas tank at the grommet. IMO it would be better to file down the nipple. That would make the cap only as safe as a directly vented cap (overpressurized fuel at the filler neck could still come out of the tank into your lap), but the seal of the gas tank would be uncompromised, so you would be less likely to have a leak than if you drilled a hole and installed a grommet for the the nipple to seat into.

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 #10 of 11 (permalink) Old 08-29-2019, 03:43 PM
Senior Member
 
MSattler's Avatar
 
Join Date: Jun 2019
Location: Iowa
Posts: 124
iTrader: (0)
 
Mine is set up the same way, with no actual hole. It always leaks out of the filler neck.

'08 Road King Classic
'86 VN750 with the following work done to it, after sitting for 19 years:
John 8:44
REV 2:9
REV 3:9
www.voat.co
MSattler is offline  
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