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post #1 of 26 (permalink) Old 11-14-2009, 09:01 PM Thread Starter
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gas smell

I am now noticing a gas smell in my garage. I've cracked the door to ventilate it. Its coming from the bike. If I turn the petcock to the OFF position, the smell is gone. I have not messed with the carbs or engine recently. I do not see any signs of a gas leak anywhere on the bike. Anything I can check that could be causing this?

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post #2 of 26 (permalink) Old 11-14-2009, 09:13 PM
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Quote:
Originally Posted by Chavisimo View Post
I am now noticing a gas smell in my garage. I've cracked the door to ventilate it. Its coming from the bike. If I turn the petcock to the OFF position, the smell is gone. I have not messed with the carbs or engine recently. I do not see any signs of a gas leak anywhere on the bike. Anything I can check that could be causing this?

Thanks,
Chavisimo
Recently I topped off my gas tank and parked my bike in the garage while it was still hot. Some gas vented out thru the overflow tube and the garage smelled like gas. Was your tank just filled? Or did you garage it while your engine was still hot? If there was no sign of a leak it might just be gas fumes escaping thru the vent tube. You could also check the gas cap.
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post #3 of 26 (permalink) Old 11-14-2009, 10:54 PM Thread Starter
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Normally I park the bike hot in the garage. Tank was not completely filled the whole time. The gas smell was there all week from full tank and end of week when the tank was low on gas. Today I did not ride the bike at all and opened the garage and let the fumes air out this morning. Then I closed the garage door and tonight there is still a gas smell. Still no signs of leaks.


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post #4 of 26 (permalink) Old 11-15-2009, 03:34 AM
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Quote:
If I turn the petcock to the OFF position, the smell is gone.
Your petcock vacuum valve is leaking.

This alone does not give the smell, so something else is leaking as well. Check the fuel hoses for tight connections. Could leak so little that you don't see it but do smell it. If the hoses are ok, you need to check the carb float needle valves.
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post #5 of 26 (permalink) Old 11-15-2009, 06:22 PM
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One more tip: Place some white paper towels completely underneath the bike between the wheels when you first park it, and the next day see if any of them show signs of being wet or if they smell of gas. This way if there is a small leak you'll be able to more accurately find where the leak is dripping.

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post #6 of 26 (permalink) Old 11-16-2009, 05:39 PM
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You have probably already done this, but if not, check the hoses for softness, brittleness or any cracking too, while checking the clamps.
At 7 years old, it may be time for new fuel hoses.

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post #7 of 26 (permalink) Old 11-17-2009, 02:07 PM
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Quote:
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You have probably already done this, but if not, check the hoses for softness, brittleness or any cracking too, while checking the clamps.
At 7 years old, it may be time for new fuel hoses.
I have a similar issue too: I smell gas when standing near my bike, with no obvious leaks. I hadn't thought about doing the PETCOCK=>OFF thing, I will see if that figures in to my equation as well.

There are only three fuel hoses in question, right? The three that attach to the petcock? I've removed them once from the petcock and put them back, as part of taking the tank off to get at something; maybe I tore one of them while using pliers to reattach them.

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Last edited by robardin; 11-17-2009 at 02:22 PM.
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post #8 of 26 (permalink) Old 11-17-2009, 03:52 PM Thread Starter
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When I get home from work, i'll check the fuel lines starting from the petcock since when the petcock is in the OFF position, the gas smell stop. Something after the petcock. I'll update after I give it another look tonight or tomorrow night.


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post #9 of 26 (permalink) Old 11-18-2009, 08:48 PM
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I dunno about Chavismo, but as for me, turning the petcock to OFF didn't help. So I took the tank off and took a closer look. It seems I have a leak somewhere at the base of my tank, near where it joins the seat, I don't know how. I can't tell exactly where it is, there's no obvious hole or crack, but if I wipe the area clear it gets a dewing of fuel after a few minutes. No beading or droplets, it just... comes from somewhere. Probably from around some possibly rusty areas under where the tank bolt goes.

I only took my tank off for the first time about a week and a half ago, so my guess is that part of the tank that's under the metal bracket that goes to the center bolt (under the seat) had rusted in such a way that when I cracked the bolt, it also cracked a tiny seam at the bottom of the tank. That's when I first started having this problem.

So, I put duct tape around the bottom of my tank as a temporary measure. I must have used too low a grade of duct tape as by the time I was putting my seat back on (after only putting on the three tank bolts and reattaching the petcock fuel hoses), the tape was already coming loose a bit from the seepage of gasoline underneath it.

So, now what? I am no welder, I have no welding equipment and am not about to try for the first time near anything that has or had gasoline in it .

No, I'm gonna try something made by Dow Chemicals called "Great Stuff" fill and foam sealant. I got a can that says it's waterproof and for plumbing use. Unless someone tells me in the next 30 minutes or so that it's a bad idea?

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post #10 of 26 (permalink) Old 11-18-2009, 09:17 PM
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Quote:
Originally Posted by robardin View Post
I dunno about Chavismo, but as for me, turning the petcock to OFF didn't help. So I took the tank off and took a closer look. It seems I have a leak somewhere at the base of my tank, near where it joins the seat, I don't know how. I can't tell exactly where it is, there's no obvious hole or crack, but if I wipe the area clear it gets a dewing of fuel after a few minutes. No beading or droplets, it just... comes from somewhere. Probably from around some possibly rusty areas under where the tank bolt goes.

I only took my tank off for the first time about a week and a half ago, so my guess is that part of the tank that's under the metal bracket that goes to the center bolt (under the seat) had rusted in such a way that when I cracked the bolt, it also cracked a tiny seam at the bottom of the tank. That's when I first started having this problem.

So, I put duct tape around the bottom of my tank as a temporary measure. I must have used too low a grade of duct tape as by the time I was putting my seat back on (after only putting on the three tank bolts and reattaching the petcock fuel hoses), the tape was already coming loose a bit from the seepage of gasoline underneath it.

So, now what? I am no welder, I have no welding equipment and am not about to try for the first time near anything that has or had gasoline in it .

No, I'm gonna try something made by Dow Chemicals called "Great Stuff" fill and foam sealant. I got a can that says it's waterproof and for plumbing use. Unless someone tells me in the next 30 minutes or so that it's a bad idea?

Permatex 09101

http://www.permatex.com/products/Aut...Repair_Kit.htm


Do not use Great Stuff, it's not gas and chemical resistant. Use Permatex 09101 Fuel tank repair kit.

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Last edited by lance328; 11-18-2009 at 09:29 PM.
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