Gas Tank Leak - from Vent Hole??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 12-19-2015, 03:25 PM Thread Starter
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Gas Tank Leak - from Vent Hole???

Now that I finally got it running again, I get a line of gas that runs from the cap area down the side of the tank. Seems to happen after I stop and its on the sidestand.

Kaw shows a part 92093 which I do not have. Could this be the problem?

Thanks!

Jon

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post #2 of 7 (permalink) Old 12-21-2015, 04:43 PM
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If that is a gas cap gasket then you need one of those to make the seal. Also take some compressed air and blow that vent hole out which is just under the cap.

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post #3 of 7 (permalink) Old 12-21-2015, 09:30 PM Thread Starter
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Quote:
Originally Posted by Goofyfoot2001 View Post
If that is a gas cap gasket then you need one of those to make the seal. Also take some compressed air and blow that vent hole out which is just under the cap.
No, its a gasket that goes around/over the vent hole, which is wide open.

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Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #4 of 7 (permalink) Old 12-22-2015, 11:35 AM
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Don't fill your tank up so much.....

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post #5 of 7 (permalink) Old 12-22-2015, 12:35 PM
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Quote:
Originally Posted by 93VN750 View Post
Now that I finally got it running again, I get a line of gas that runs from the cap area down the side of the tank. Seems to happen after I stop and its on the sidestand.

Kaw shows a part 92093 which I do not have. Could this be the problem?

Thanks!

Jon
It sounds like:
  1. the gas tank is overfilled and
  2. the gas cap seal (part #92093) has failed or the springs that press it against the tank have failed

If the seal is working properly, then the overflow of fuel should travel out the gas cap vent and down the tube attached to the back of the gas tank (under the seat).

I would inspect the gas cap seal and the springs that press it against the tank. If the seal is hard or cracked, then replace it. If the springs are weak or missing, replace them. This is also a great opportunity to clean the vent system (end-to-end) to avoid future POOGS.

You don't want open access to flammable fuel that close to your junk!

Also, as KM points out, don't overfill the tank. Especially on hot days when the cold fuel (stored in underground tanks) expands after it is placed into a hot gas tank.


Chris Glennon - Portland, OR

Last edited by cglennon; 12-22-2015 at 12:42 PM.
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post #6 of 7 (permalink) Old 12-22-2015, 05:40 PM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
Don't fill your tank up so much.....
Its still doing it and the gas gauge is under 3/4. I've had this bike for a long time and it never did this before when I filled it the same way.

I do not have a hose attached to the back of the tank, never did.

Is that a California only thing?

I will pull of the gas cap and have a good look.

Jon

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Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #7 of 7 (permalink) Old 12-23-2015, 06:49 AM
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The vent hose off the back of the tank is not a California thing. It's there so that if you overfill the tank the gas can run out to the ground without running all over everything under the tank.

Does it always leak out like that or only when it's over half a tank full? If you get lower on the tank of gas and it still does it, then my thought would be the gas cap seal like cglennon said. Gas splashes around in the tank while you hit bumps and all and some of it leaks out.

If it only does it when the tank is full or close to being full, perhaps the venting isn't working properly and as the gas expands the pressure causes it leak out. A good cleaning like described in the POOGS sticky never hurts.

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