Leaking gas from petcock? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 25 (permalink) Old 08-28-2013, 03:37 PM Thread Starter
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Leaking gas from petcock?

Just out on a new tank and proceeded to pour some gas in and it started leaking from the petcock. Not sure if the seal underneath it is bad or what. All it has is that circle seal pushed into it right? Or is there a whole nother rubber gasket I'm missing? Also It wouldn't start. Not sure if its cause I didn't have enough gas in it or maybe because I didn't put the cap on it. Gotta find screws for that. Any hell would be great.
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post #2 of 25 (permalink) Old 08-28-2013, 06:38 PM
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Originally Posted by Nitrospaz9 View Post
Just out on a new tank and proceeded to pour some gas in and it started leaking from the petcock. Not sure if the seal underneath it is bad or what. All it has is that circle seal pushed into it right? Or is there a whole nother rubber gasket I'm missing? Also It wouldn't start. Not sure if its cause I didn't have enough gas in it or maybe because I didn't put the cap on it. Gotta find screws for that. Any hell would be great.
With my old original '86 tank, I rebuilt the leaking Petcock. After rebuild, I still had minor leakage in the area around the Petcock....finally diagnosed it as the tank seal....removed Petcock from tank, cut & added a cereal box gasket between the petcock & tank...no more leakage.
EDIT: Also used gasket sealer with added gasket.
hope this helps

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 08-29-2013 at 01:03 AM.
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post #3 of 25 (permalink) Old 08-28-2013, 08:08 PM Thread Starter
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Lol maybe it will. Surprised the cardboard doesn't leak
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post #4 of 25 (permalink) Old 08-28-2013, 09:23 PM
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Gonna be home this weekend ?....I'll take a ride down there and help ya out....bout a half hour/40 mins I think....lemme know....I aint doin nuthin, broke, and the ol lady is gone till Tues....what else I got to do ? Lol...bike has almost a full tank....



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post #5 of 25 (permalink) Old 08-28-2013, 10:47 PM Thread Starter
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Sorry wolfie. Got a friends bachelor party in Maryland this weekend or else I would definitely take you up on it. Won't get back till mid day Monday. To bad cause I'd like to meet you and KC. Some day soon I guess if I could ever get this pig runnin lol
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post #6 of 25 (permalink) Old 08-29-2013, 07:14 AM
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There are also two plastic washers under the heads of the two screw bolting the petrol tap assembly onto the tank. If they are missing fuel will leak. The tap itself is sealed with to the tank with an O-ring, and there are numerous sealing parts in the tap re-build kit. All of these parts need to be in good order for the tap to work and be leak free.

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post #7 of 25 (permalink) Old 08-29-2013, 10:06 AM Thread Starter
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Have the washers in there. I may try that cereal box washer lol. Once I have a little money I guess I'll order all the seals for it. Any sites that ya'll use for that stuff? Also may wanna replace the rubber hoses.
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post #8 of 25 (permalink) Old 08-29-2013, 03:35 PM
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Is it the petcock itself that is leaking, or is it leaking between the petcock and the tank? There is a an 0-ring between the tank and petcock shaped somewhat like a paperclip. If that is the problem, that's all you need. DON'T use any kind of sealer or home made gaskets on it. If it is the petcock itself, it can be any of the rubber parts inside, and there really is no way to tell which. Might be all of them. Replacing all of them gets expensive.

Did you just have the petcock off? If you did, that long weird shaped 0-ring could be completely flattened out. I also know someone who repainted a gas tank with lacquer, put the petcock back on, put gas in the tank, the lacquer melted, and it started leaking.

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post #9 of 25 (permalink) Old 08-29-2013, 04:39 PM Thread Starter
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The 0-ring really isn't that big on it. Looks kinda pressed in. I might just order one of the kits on eBay. I thought maybe I was missing a gasket or something in between the tank and petcock
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post #10 of 25 (permalink) Old 08-30-2013, 09:21 AM
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Quote:
Originally Posted by Nitrospaz9 View Post
Have the washers in there. I may try that cereal box washer lol. Once I have a little money I guess I'll order all the seals for it. Any sites that ya'll use for that stuff? Also may wanna replace the rubber hoses.
I searched Ebay for the best deal for a Petcock Rebuild kit, VN750.
......30 some dollars if a remember correctly.


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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