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#1 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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gas cap leak
ok.....so gas is at $2.40 a gallon, and everytime I fill my tank I figure I splash/slosh at least $1.50 all over the side of the truck. I tried taking a large O-ring, cutting it down the center, and using it as a make shift gasket, but it doesn't seem to seal correctly, and without that spacer, the cap and the cardboard gasket are even worse.....any suggestions?
Yes, I have tried not filling it to the top, I never use the automatic fill on the pump, but I only have the 16 gallon tank in the cab.....and only filling it half way full everytime isn't really an option.
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's ![]() 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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#2 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: gas cap leak
I misunderstood his problem. So, I'm deleting my comment. Thanks, guys.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 01-06-2006 at 12:03 PM. |
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#3 |
Registered User
Join Date: Aug 2005
Location: Texas
Posts: 124
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Re: gas cap leak
he is talking about after he fills up and the gas sloshes out of the tank then you are driving, not while filling up. Maybe try a different gas cap.
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1970 Short Stepside----Process of Restoring 1983 1/2 Silverado |
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#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: gas cap leak
Any parts store will have them in chrome for you for less than 10 bucks.
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#5 |
Registered User
Join Date: Oct 2003
Location: Abilene Texas
Posts: 287
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Re: gas cap leak
there is a papeer gasket on the gas cap get another one and put with the origanal one it will solve your problem it worked for me someone off of here told me to try it
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: gas cap leak
All mine have had a thick rubber flat gasket.
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#7 |
Registered User
Join Date: Oct 2004
Location: Currently New Windsor, NY but Texas is home
Posts: 332
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Re: gas cap leak
I had the same problem with my 71'. Got tired of it, and bought a new cap with new seals on it at Auto Zone. Problem solved.
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2002 Silverado 2500HD LB7 CCSB LT EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's 2004 Tahoe LT 2006 Silverado Z71 LS 1971 Chevy C10 |
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#8 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: gas cap leak
Got a NAPA nearby ? Stock shelf item usually. Don't expect it to last forever though, 2-3 years and you may need a new one when the gaskets wear out.
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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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#9 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: gas cap leak
Ditto Green's NAPA advice, though I typically get a lot more than 2 to 3 years out of 'em!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#10 |
Registered User
Join Date: May 2005
Location: roanoke wv
Posts: 60
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Re: gas cap leak
If you dont want to change caps , get a piece or cork gasket material and make a new gasket. It worked fine for me.
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#11 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: gas cap leak
Go to the parts store and get a new cap. They are now unvented (by law) and the gas doesn't slosh out.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#12 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: gas cap leak
Well, not to be picky, but they do have a spring loaded vent that lets air into the tank as the gas gets used up else you would pull a vacuum in the tank and the truck would stall out. The vent and seal however are meant to keep the gas and vapors in and some pressure can build up in the tank. I still don't fill mine to the top because it doesn't seem 100 pecent tight. Also check the fill neck over real good, they can get bunged up over the years, straighten and bend as needed to get the cap to sit tight as possible.
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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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#13 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: gas cap leak
So the rubber gasket can't be purchased seperately?
I know my father has a 55 chevy, and he had to get the guy behind the counter to go through 10 different gas caps before he found one that fit right...figured this wasn't going to be an off the shelf item. No on the napa by the way....autozone carry this perhaps?
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's ![]() 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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#14 |
Registered User
Join Date: Feb 2005
Location: Owosso, Mi
Posts: 242
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Re: gas cap leak
I have had this problem before on different trucks, and the double cork gasket has worked on all of them except one. I put a tank in a 67 and the cap leaked, tried several things including a new cap but it still leaked. Finally I discovered that the tank had been in a truck that was in an accident and it had actually damaged the surface where the gasket should seal. It was bent, not allowing it to seal. Might want to check that as well.
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67 short wide 355ci 3 on tree 69 short wide 250ci 3 on tree 68 long wide 283 3 on tree 72 2wd Blazer project 454 5 speed ![]() |
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#15 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: gas cap leak
Auto zone maybe, I know for a facr advance auto has them on hand. I used to have the number here for the cap, but it'd disapeared on me. They have always had them in stock every time I went for one. It is still vented, I think fred's reference are to 71 and newer, which, by law, can not be vented (emissions regulations that started in 71)
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#16 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,544
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Re: gas cap leak
The Stant 10623 is what I used to buy for my '67. I'd have to buy a new one about every 2-3 years because the rubber seal would crack.
I have found that when I'm twisting my gas cap on, it gets tighter as I'm turning it, and then at the end it gets loose. If I don't quite tighten it on all the way and stop turning it before it starts getting loose, it seals better. |
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#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: gas cap leak
That may be the one I am thinking of.. smooth chrome with the sticker in the center? (peel it off and use carb cleaner to remove the glue0
My olf GMC was like that with the twisting, but the one ton isn't. I dunno WHY some trucks are like that, but it is worth paying attention to if your cap pukes down the side. |
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#18 |
Registered User
Join Date: Dec 2003
Location: Glendale Arizona
Posts: 747
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Re: gas cap leak
I went to autozone and they looked u the number on the computer and mine seals good.
And why is it at some gas stations when you fill it, it doesn't shut off and it pours out?
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"A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo |
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#19 |
Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: gas cap leak
thanks everyone, I went to advanced and they had it....the guy behind the counter seemed very concerned that the engine and drivetrain questions were answered correctly after I told him it shouildn't matter........so I did a test, and a gas cap for a 70 2wd half ton with a 350 is an acceptible replacement for an original gas cap on a 70 4wd with an I6!
Anyway....$4.xx and it works like a charm.....filled it to the neck, drove down the worst dirt road around and no gas residue on the bed whatsoever!
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's ![]() 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! Last edited by shelby987; 01-07-2006 at 09:44 AM. |
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#20 | |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: gas cap leak
Quote:
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#21 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: gas cap leak
Mine always shuts off on my 68 with original tank on my 76 it would never shut off.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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