Pressure in gas tank


Information and questions on GL1100 Goldwings (1980-1983)
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'ol pappy t
Posts: 18
Joined: Mon Jan 24, 2011 9:09 pm
Location: Huntley IL
Motorcycle: 1982 GL1100A Aspencade

Pressure in gas tank

Postby 'ol pappy t » Tue Mar 08, 2011 4:08 pm



Okay, I'm stumped ! My GL1100A can sit in my garage for a day or less and build up pressure in the gas tank WITHOUT having been run. I put a new gas cap on today, a replacement from Napa that I found on replacement part #'s , and after an hour a pretty good whoosh came out again. I know there should be a little build up of pressure when running, but this ?? I reinstalled the carbs after rebuild and not thinking about it turned the petcock to on before starting it up and saw the gas rushing through the temporary clear hose and filter setup, well several seconds later I smelled the gas that was leaking from the carbs and l/s exhaust onto the floor . Lets shut off the gas valve now. I don't see any other vents on the tank itself or am I missing something ? Also I'm posting about a high idle issue, check it out..? Thanks for any input in advance guys...



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MJSantos
Posts: 317
Joined: Wed Dec 16, 2009 9:19 pm
Location: York, Pa
Motorcycle: 1983 GL1100I
1983 GL1100 Custom
2002 Shadow
1983 Honda Magna V45
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Re: Pressure in gas tank

Postby MJSantos » Tue Mar 08, 2011 6:10 pm

The pressure buildup sitting could be the gas expanding temp swings. It happens if the gas was cold then you move the bike into a warm garage.
Now the flooding piece of this could be floats not shutting the fuel off when the bowls ae full. Could also be causing the fast idle problem creating too rich of a mixture.

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littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: Pressure in gas tank

Postby littlebeaver » Tue Mar 08, 2011 7:03 pm

My Nomad used to whistle at me from that pressure..funny.. :lol:

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WingAdmin
Site Admin
Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Pressure in gas tank

Postby WingAdmin » Tue Mar 08, 2011 8:21 pm

That's pretty normal. You'll see the same thing happen in jerry cans of gasoline that are sealed, just sitting there.

'ol pappy t
Posts: 18
Joined: Mon Jan 24, 2011 9:09 pm
Location: Huntley IL
Motorcycle: 1982 GL1100A Aspencade

Re: Pressure in gas tank

Postby 'ol pappy t » Tue Mar 08, 2011 8:27 pm

I'm pretty sure the flooding in this case was from the pressure build up in the tank, reason being when I left the cap off since then it hasn't leaked. Unfortunately my garage isn't heated but well insulated, although when I'm working on it I have a couple 1000 watt halogen lamps going, that can generate a little heat ! As for that Nomad whistleing , I think it was happy to have your attention aside from your GW getting all the attention !! I'll have to check out what those screws with the springs are for on the sides of the carbs, when I put down pressure on one or the other side it idles down, or let my carb man monkey with it.

imfree
Posts: 120
Joined: Sun Jan 09, 2011 11:07 am
Location: Millbrook ROLL TIDE Al.
Motorcycle: 1982 GL1100I

Re: Pressure in gas tank

Postby imfree » Thu Mar 10, 2011 8:54 am

Those screws are where you sync your carbs,If you have not done this before read the article by Wingadmin on how to sync your carbs,But If it was me I would check the float levels and seats first and then sync the carbs.All of my wings get a lot of pressure in the tanks here in sunny ROLL TIDE Alabama,But none of them leak.Joe

imfree
Posts: 120
Joined: Sun Jan 09, 2011 11:07 am
Location: Millbrook ROLL TIDE Al.
Motorcycle: 1982 GL1100I

Re: Pressure in gas tank

Postby imfree » Thu Mar 10, 2011 8:57 am

I forgot to tell you the shipping on that lid is around $17.00.

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vonzoog
Posts: 17
Joined: Tue Jan 31, 2012 11:45 am
Location: Delaware
Motorcycle: 1975 GL1000

Re: Pressure in gas tank

Postby vonzoog » Sat Mar 31, 2012 3:45 pm

Could you please tell me the NAPA part number for the fuel cap? I need a cap for my 75 and I am having no luck.

Thanks,


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