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04-15-2009, 10:48 AM
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#1 |
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Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
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gas cap, vented or not?
My gas cap went missing this past weekend and I will need to purchase a replacement.
I thought I remember reading discussions on here about vented and non-vented caps for different years but a search has found my nothing. Should a 69 GMC 1/2 ton with stock tank have a vented or non-vented gas cap?
__________________
Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
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04-15-2009, 11:03 AM
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#2 |
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Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
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Re: gas cap, vented or not?
Well a little google work and I think I answered my own question.
Scott Super Trucks lists two different gas caps. 1970 and earlier and 1971/72. Stant gas caps website also lists a different part number for 1971 and one. 1970 and earlier Stant 10623 1971 Stant 10704 Still not sure which is vented?
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Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
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04-15-2009, 11:04 AM
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#3 |
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Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: gas cap, vented or not?
My '69 uses a vented cap.
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Beat it to fit, Paint it to match... 
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04-15-2009, 11:27 AM
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#4 |
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454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: gas cap, vented or not?
An educated guess would say that you need a vented cap, my 71 with EEC uses a pressurised non vented cap.
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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04-15-2009, 11:41 AM
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#5 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: gas cap, vented or not?
eearlier ones are vented 71 and later non vented for EPA regs
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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04-15-2009, 12:49 PM
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#6 |
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Registered User
Join Date: Jul 2006
Location: El Cajon Ca
Posts: 84
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Re: gas cap, vented or not?
On non emission engines if you use the non-vented cap you take the chance of causing the tank to collapse.
Last edited by 68SHORTBOX; 04-15-2009 at 12:50 PM. |
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04-15-2009, 01:42 PM
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#7 |
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Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
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Re: gas cap, vented or not?
Well miracles of all miracles, my local parts store had one in stock for $13.
__________________
Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
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04-15-2009, 02:07 PM
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#8 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,996
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Re: gas cap, vented or not?
67-70 stock gas tank = vented cap
71-72 (with EEC) 1/2 ton = non-vented cap All 3/4 ton trucks = vented cap
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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