GAS CAP FACTS


Reference information handy in one place - part numbers, aftermarket equivalents, circuit diagrams, and more
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indianakid
Posts: 167
Joined: Sun Sep 26, 2010 5:28 pm
Location: long beach, ca
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GAS CAP FACTS

Post by indianakid » Fri Sep 25, 2015 10:56 pm



OK...... There has been a lot of discussions on gas caps. I don't want to get into what others have do to them. I just want to cover what they are. They are a very well designed and manufactured part and is very reliable. The cap maintains positive and negative (vacuum) pressure in the tank. The cap will relive pressure at about 2psi which is fuel pump pressure. This pressure relief valve portion consists of a spring and the tabs that hold the cap on the tank along with the seal. You can feel the spring force and seal every time you remove and install the gas cap. The vacuum relief portion is inside the cap and is a simple spring and seal relief valve that will not allow the vacuum to get greater than 2 inhg. The cap is easily disassembled for inspection. Please see attached for additional information.
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indianakid
Posts: 167
Joined: Sun Sep 26, 2010 5:28 pm
Location: long beach, ca
Motorcycle: 83 GL1100 I

Re: GAS CAP FACTS

Post by indianakid » Fri Sep 25, 2015 10:57 pm

3 more slide that didnt fit in the original post.
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f1xrupr
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Joined: Mon Jan 13, 2014 6:13 am
Location: Triplet Va
Motorcycle: 1980 gl 1100 Std. Vetter

Re: GAS CAP FACTS

Post by f1xrupr » Sat Sep 26, 2015 6:10 am

Vary nice post!....nice pictures!....should clear up lots of concerns and questions.
My exercise bike is a goldwing.

gwbldad
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Joined: Thu May 27, 2010 11:19 am
Location: White Bear Lake, MN
Motorcycle: 1983 GL1100 Interstate

Re: GAS CAP FACTS

Post by gwbldad » Mon Oct 05, 2015 8:53 am

Great post! Who would have thought a gas cap was such a highly designed component? After reading this thread, I will never take my gas cap for granted again!

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Oldbear
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Location: Linden, Alberta, Canada
Motorcycle: 1983 GL1100A Aspencade

Re: GAS CAP FACTS

Post by Oldbear » Mon Oct 05, 2015 5:41 pm

Easier to see why years of gumming up can keep it from working correctly.

Very "full" write up. Thanks for sharing.
My wife is the greatest - she won't let me sell my bike - I'm less grumpy when I ride...

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Uncle Fester
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Location: Bethany, Ok, right off Route 66 !
Motorcycle: 1996 GL-1500 Cali model 'Wing, blue in color, named Ol'Blue

Re: GAS CAP FACTS

Post by Uncle Fester » Sat Feb 20, 2016 5:32 pm

Nice job on the post, thank you !

I noticed your cap in the pictures does not have a "bleeder nipple" (?) on it like my GL1500 cap does, does that make any difference when taking apart, cleaning, and reassembly ?

Thanks again !


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