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05-26-2022, 04:37 PM
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#1 |
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Registered User
 
Join Date: Oct 2015
Location: Dallas Texas
Posts: 1,380
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Gas Cap Identify Help
http://67-72chevytrucks.com/vboard/s...d.php?t=178829
I found the above post by Joesjunk from 2005. He was asking the same question I am. Reading his thread I still can't figure out what this cap fits. I have a gas cap GM3927086 and I don't know what it fits. Says "pressure vacuum" on the inside of the cap. Any help would be appreciated. Thanks |
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05-26-2022, 05:41 PM
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#2 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,022
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Re: Gas Cap Identify Help
What year is your truck? Half ton, or bigger?
'72s had a narrower fill neck diameter, and in 1/2 ton, had EEC emissions connections, like a return line from the carb, and a charcoal evaporator in the engine bay. Earlier trucks and 3/4, and 1 tons didn't require emissions stuff. Some gas caps were vented, some non-vented. If you take the gas cap off, is there a whoosh?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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05-26-2022, 05:56 PM
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#3 |
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Registered User
Join Date: Oct 2015
Location: Dallas Texas
Posts: 1,380
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Re: Gas Cap Identify Help
My truck is a half ton. The cap in question is a nos cap I have on the shelf and need to know what trucks it fits. I am clearing out my shelves so before I put this cap up for sale I'd like to have some more information. This is not a for sale thread. Thanks for your help
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05-27-2022, 09:17 AM
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#4 |
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Senior Member
Join Date: May 2001
Location: Independence MO.
Posts: 7,689
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Re: Gas Cap Identify Help
Not sure on the part number, but can you post a picture of the front and back of it?
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72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale |
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05-27-2022, 09:29 AM
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#5 |
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Carpe manana
  
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,278
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Re: Gas Cap Identify Help
See this thread beginning w post #46: https://67-72chevytrucks.com/vboard/...d.php?t=810278
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308  Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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05-27-2022, 10:01 AM
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#6 |
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Registered User
Join Date: Oct 2015
Location: Dallas Texas
Posts: 1,380
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Re: Gas Cap Identify Help
Pics of the cap
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05-27-2022, 12:24 PM
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#7 |
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Registered User
Join Date: Oct 2015
Location: Dallas Texas
Posts: 1,380
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Re: Gas Cap Identify Help
one more photo. again this is not a for sale thread. thanks for your help.
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05-27-2022, 04:44 PM
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#8 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,022
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Re: Gas Cap Identify Help
''Pressure Vacuum'' probably means Non-Vented.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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05-28-2022, 12:41 PM
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#9 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Gas Cap Identify Help
Found this... https://67-72chevytrucks.com/vboard/...d.php?t=818739
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property"  "Be American, Buy American" 
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05-28-2022, 06:40 PM
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#10 |
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Registered User
Join Date: Oct 2015
Location: Dallas Texas
Posts: 1,380
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Re: Gas Cap Identify Help
Thanks all for the help.
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06-03-2022, 03:47 PM
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#11 |
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Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,959
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Re: Gas Cap Identify Help
I found this when I googled the part number;
http://www.gmpartswiki.com/getpage?pageid=218675
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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06-03-2022, 07:30 PM
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#12 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 10,787
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Re: Gas Cap Identify Help
That would appear to make it a vented cap. I believe the vented caps for those years would hold 2 or 3 psi of pressure before venting air out of the tank. Hence the "Pressure Vacuum" stamping.
It was to keep fuel from sloshing out of the fuel fill when going around right hand corners when the tank is more than 1/2 full. My Burban has that problem as the locking cap I have isn't vented correctly.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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06-03-2022, 09:37 PM
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#13 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,022
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Re: Gas Cap Identify Help
I quit using locking caps years ago. I found I lost more gas making hard rights than was ever likely to be siphoned out by theives. [The original use of the Canadian insult ''Hosers'' referred to gas siphon theives.]
Also when I lost the cap lock key, and had to musclef@%$ it off -- the neck was damaged and I wound up swapping in a '67 tank. After hot tanking it, painting the outside spraycan Aluminum and putting in a new float assembly. And of course, the sender reads all different now. The cap I have on the Stepside now goes ''Whoosh'' when I crack it open.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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