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#1 |
Registered User
Join Date: Aug 2006
Location: Mt Holly, NJ
Posts: 5
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Gas Cap Leak
Hello All,
I'm new to the forum so bear with me, I have a 72 C10 with a 307. My problem is I have gas leaking from my gas cap after I fill up the tank. I assume this is due to my gas cap, does any one have a recommendation on what type is best. The one I currently use is a locking type. I have searched the forum for anything on this subject and have not found any. Thanks for any help, Jon |
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#2 |
Chevy truck addict
Join Date: Apr 2005
Location: Thornton Colorado
Posts: 825
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Re: Gas Cap Leak
i have this problem also and would like to fix it...
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Gas Cap Leak
just go to napa carquest etc and get a nice chrome one it should fix the problem theres really not much of a selection
__________________
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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#4 |
Chevy truck addict
Join Date: Apr 2005
Location: Thornton Colorado
Posts: 825
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Re: Gas Cap Leak
do they have ones that look like the factory chrome twist on one?
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Gas Cap Leak
I know they have a stant (plain chrome) for the 70 and older. The locking ones normally leak from my expireance.
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#6 |
Registered User
Join Date: Aug 2006
Location: Mt Holly, NJ
Posts: 5
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Re: Gas Cap Leak
I was hoping that it was that simple... Just wanted to make sure I wasn't the only one...
Thanks, Jon |
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#7 |
Active Member
![]() Join Date: Nov 2005
Location: Austin
Posts: 217
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Re: Gas Cap Leak
My original gas cap leaked as well. I picked up a $5 replacement at advance auto. Looks pretty close to the original, but not exact.
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#8 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Gas Cap Leak
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__________________
Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#9 |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: Gas Cap Leak
If you look inside you'll see a rubber or cardboard ring. If that's compressed, it'll allow gas to spill out and not seal effectively. What I did several years ago when I was running the stock tank is make my own gasket out of stiff cardboard gasket material and it worked like a charm!
__________________
1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
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#10 |
Registered User
Join Date: Jul 2006
Location: Salem, Oregon
Posts: 12
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Re: Gas Cap Leak
Those locking ones wear out pretty quick. If that rubber seal starts to get old or compressed, it's time for a new one. I've never found a locking one that seals quite like a stock twist on.
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#11 |
Licensed to Thrill!
Join Date: Apr 2006
Location: Northwest, GA
Posts: 1,673
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Re: Gas Cap Leak
The only kind I ever had work with the stock style tank twist on actually was a locking one.
It was ugly as sin, but it worked. The cap itself was very thick/tall, and had a very thick rubber gasket. I'd say it was about 3" tall overall. It was a different type than all the rest I had tried. On another note - if you are in the midst of a project, or into bodywork - my CoolCap doesn't leak a bit. ![]() |
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#12 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Re: Gas Cap Leak
I had a locking cap from NAPA that lasted several years before the seal finally expired. Got a new one (2 or 3 years ago) and it's still good.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#13 |
Registered User
Join Date: Sep 2005
Location: 9000' Mountain Man
Posts: 326
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Re: Gas Cap Leak
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#14 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Re: Gas Cap Leak
I bought a locking one at carquest for almost 20 bucks, it's about a year old and it's never leaked. This one only fits 67-70, the 71-72 looks different but should have the same gasket.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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#15 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: Gas Cap Leak
I definately recommend fixing it though, with the current gas prices you need ever drop!
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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#16 |
FixerUpper
Join Date: Dec 2000
Location: Lawton ,Oklahoma
Posts: 102
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Re: Gas Cap Leak
Buy two and use both seals on one cap, its tighter and I have no problems with that any more . I own three trucks and my boys drive constantly. and 2 of my friends have them as well. This is a Fix.
__________________
1-Cheyenne 72 700R4,camper special all original when i got it then i improved it a little Blue and White 3.73,4 core rad, 700r4,MSD hei ,turbo muffs dual exhaust only had 50 k on it when i bought original mile sweet old ladies truck turned into a stump puller No. 2 C-10 72 w/air and Tilt and power and the cheyenne trim package shtbd is dropped 2-3w/factory tilt has torq thrust 2 rims 2003 dodge neon steel blue color |
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#17 |
Registered User
Join Date: May 2000
Location: Victoria, BC, Canada
Posts: 2,410
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Re: Gas Cap Leak
I go thru a locking gas cap about every 2 years. Can only find one type, all black. I found that the gaskets dry up and crack. I'm still looking for a vented cap. I can't believe how much pressure can build up on a hot summer day..."WHOOOOSH!" At least I know the seal is good. I might drill a tiny 1/32" hole thru the cap.
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. |
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#18 |
Registered User
Join Date: Aug 2006
Location: Mt Holly, NJ
Posts: 5
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Re: Gas Cap Leak
I found a solution, Go to Lowe's in the plumbing area, they sell this reddish-brown gasket material for a dollar or so. Trace your existing gasket and cut out a new or (in my case) for double thickness and slide it on the cap.
I have had no leaks since, about two weeks... Very cheap solution... |
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#19 |
WTB this ad
Join Date: Sep 2004
Location: Lafayette Georgia
Posts: 5,074
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Re: Gas Cap Leak
My cap was leaking as well, I bought a replacement but it just didn't feel as heavy as the original. I ended up taking the gasket off the new cap and installing it on my old cap. It worked like a charm.
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#20 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Gas Cap Leak
What year is your truck? Some years had vented gas caps and some didn't. Something to think about.
__________________
Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 10-24-2006 at 05:37 PM. |
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#21 | |
Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: Gas Cap Leak
Quote:
A.P. |
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#22 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
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Re: Gas Cap Leak
Make sure the Lowe's stuff holds up to petroleum products!. If not, it could deteriorate from the backside and before you know it, little pieces of it could fall in the tank and clog the fuel line.
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69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
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#23 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: Gas Cap Leak
Also take a close look at the tangs inside if the tank neck. They can get bent from the gas nozzle or whatever. Sometimes they need to be tapped back down or straightened, also make sure the top surface of the tank neck is nice and flat and even height all around, that will make the cap sit tighter, just try not to make too many sparks if it needs some adjustment !!!
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#24 | |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: Gas Cap Leak
Quote:
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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