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04-06-2018, 06:25 PM
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#1 |
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Junior Member
 Join Date: Apr 2015
Location: Bremerton, washington
Posts: 78
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Gas Cap
Gasket is cracking What is causing this? This is the second cap in less than a year
Last edited by inline67c20; 04-06-2018 at 07:43 PM. |
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04-06-2018, 07:27 PM
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#2 |
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Registered User
Join Date: Jul 2013
Location: LI, NY 11801
Posts: 1,140
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Re: Gas Cap
The cracked gasket?
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1970 C10 8' Fleetside, L6 250, 3 on the Tree. The most basic of pickup trucks! |
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04-06-2018, 07:45 PM
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#3 |
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Junior Member
Join Date: Apr 2015
Location: Bremerton, washington
Posts: 78
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Re: Gas Cap
Yes the gasket . This cap is only 4 months old
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04-06-2018, 07:50 PM
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#4 |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Gas Cap
Are those supposed to be good quality caps you're buying? Mine's at least 5yrs old and the gasket is fine. Doesn't fit particularly tight but doesn't slop gas out or smell. Does the surface that bears on the gasket look/feel smooth? I run both ethanol and non-ethanol in mine. Maybe a little dab of lubricant would keep it from doing that.
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Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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04-06-2018, 08:22 PM
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#5 |
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Registered User
Join Date: Feb 2015
Location: TX Hill Country
Posts: 150
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Re: Gas Cap
My gas cap on the 67 C10 did the same thing in no time as well.
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04-06-2018, 08:41 PM
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#6 |
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Junior Member
Join Date: Apr 2015
Location: Bremerton, washington
Posts: 78
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Re: Gas Cap
They were both stant from Napa.
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04-08-2018, 12:39 PM
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#7 |
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Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Gas Cap
Maker probably cheaped out on materials. Acquire a piece of Nitrile sheet and cut your own ring. 3/16 thick ought to do it.
__________________
1969 c-10 Step Side Long Bed. I-6 250cid =  = 1969 Pontiac GTO hard top. 400, 4-speed.
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04-08-2018, 12:40 PM
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#8 |
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Registered User
Join Date: Oct 2016
Location: san bernardino ca
Posts: 1,611
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Re: Gas Cap
China cheet.
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04-08-2018, 12:59 PM
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#9 |
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Registered User
Join Date: Aug 2014
Location: Mena,Arkansas
Posts: 485
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Re: Gas Cap
Part of it is the cheaper materials used in today's replacement parts.Part of it is the 10% ethenol in the fuel.
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68' with no bells or whistles unless I add'em. |
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04-08-2018, 02:30 PM
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#10 | |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Gas Cap
Quote:
I like the idea of cutting a piece of nitrile and putting on there. I have one on my truck, Stant, from Napa and it is cracked but not yet broken up yet. Over a 1 year old now. Updated, something to definitely to consider, Viton is the product to use in this application. Reasoning Here: https://www.customadvanced.com/chemi...ine&rubber=NBR So I just checked my cap and that gasket comes right off there and is cut in a circle. This one is going to be an easy permanent fix. I love the internet for one thing, information collection: https://www.discountrubberdirect.com...-ring-gaskets/ Last edited by toolboxchev; 04-08-2018 at 02:44 PM. |
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04-08-2018, 03:01 PM
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#11 | |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Gas Cap
Quote:
I like the idea of cutting a piece of nitrile and putting on there. I have one on my truck, Stant, from Napa and it is cracked but not yet broken up yet. Over a 1 year old now. |
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04-08-2018, 03:04 PM
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#12 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,839
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Re: Gas Cap
If you have an old inner tube lying around, try cutting a gasket from it. I did it years ago and thought it would fail within months, but it's still not showing any signs of failure. It also seals tighter. Worth a shot.
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04-08-2018, 03:38 PM
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#13 |
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Junior Member
Join Date: Apr 2015
Location: Bremerton, washington
Posts: 78
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Re: Gas Cap
Thanks for all the great info.
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