Gas Spillage in Corners - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazer72 · 01-26-2011, 07:37 PM

Obviously the first thing I did it buy a new gas cap - twice. Tried three different caps, all did the same thing
when I take a curve or a right turn, gas spills out the filler neck. WTF?

Monte Carlo Man · 01-26-2011, 07:42 PM

So we are talking about a '72 Blazer here?

blazer72 · 01-26-2011, 08:32 PM

Quote:

Originally Posted by Monte Carlo Man

So we are talking about a '72 Blazer here?

Sorry, nope, my 71 LWB Fleetside.

cheyenne shortstep · 01-27-2011, 01:50 AM

I had the same problem but didn't want to give up my old gas cap. So I bought a six dollar cap at Kragens and swapped the gasket.

scrapmetalart · 01-27-2011, 06:41 AM

Quote:

Originally Posted by cheyenne shortstep

I had the same problem but didn't want to give up my old gas cap. So I bought a six dollar cap at Kragens and swapped the gasket.

Good idea.

I dont fill my tank up all the way to try & avoid the spilage...

**leddzepp** · 01-26-2011, 07:55 PM

Have you inspected the filler neck? A lot of times they are cracked from 40+ years of gas filler nozzles being leaned on while filling the tank.

71gmcburb · 01-26-2011, 08:18 PM

check the vent tube had the same problem on my 66 econoline and that was the problem

Constructor1 · 01-27-2011, 01:33 PM

I am having the same problem on my 1970. My problem stems from the fact that some "Jackleg" mangled the top of the neck before she was mine. There is only 1 "ear" left for the cap to grab. Has anyone ever replaced just the fill neck? If so how would I go about it?

**Classic Heartbeat** · 01-27-2011, 01:45 PM

The problem is a worn filler neck. You can double up the gasket, or you can use a stant locking gas cap witch seals better. Sometimes you can just back the cap off untill the dogs come out of the notches. That will hold the cap down harder, or you can replace the tank.

Quote:

check the vent tube had the same problem on my 66 econoline and that was the problem

Trucks don't have vent tubes on the filler neck.
WES

dixietruck71 · 01-28-2011, 01:18 AM

Trucks don't have vent tubes on the filler neck.
WES[/QUOTE]

my truck has a vent tube on the filler neck of the stock tank, its he EEC evap emission style tank

matthew20061 · 01-27-2011, 03:55 PM

Our 70' has the same problem with gas leaking out of the gas cap if its filled all the way, think I'll try the double gasket trick to see if that fixes it.

BLACK AND BLUE 67-72 · 01-27-2011, 05:42 PM

Yep sounds like a worn neck, either new tank or double the gasket on the cap

blazer72 · 01-27-2011, 05:52 PM

never thought to double up the gasket. You guys kick ass - I have 3 or 4 caps laying around. cheap fix if it works.

thanks fellas.

flashed · 01-27-2011, 08:42 PM

I have a new tank and a new cap and it still spills out the neck.I may also try the double gasket idea.

oldblue1968chevy · 01-27-2011, 09:57 PM

Mine did it also, locking gas cap at a yard sale for $1. I love an old truck.

blazer72 · 01-27-2011, 11:41 PM

Quote:

Originally Posted by oldblue1968chevy

Mine did it also, locking gas cap at a yard sale for $1. I love an old truck.

yeah, I had a locker when I got it, I hate them so I took it off, it probably didn't leak. Don't know if I still have it.

I am trying the double seal tomorrow.

dixietruck71 · 01-28-2011, 01:23 AM

last week i bought some 3/16" thick gasket material from the auto part store. cut out a gasket and put it over the old one and it works awesome. No more leak. The cap is tight as hell though, but its better than a gas stain on the bed and cab corner. The gasket material was $3.49 and was about 12" x 16" square

3118tim · 01-28-2011, 01:39 AM

looking for 72 blazer rear hatch strikers.
Any leads?

shiner2001 · 01-28-2011, 04:04 AM

My 72 leaks like a sieve after a fill up too. When I take a right turn I can look in the mirror and just see dollars gurgling out of the filler neck. It's a locking gas cap, which I don't like, so I think I'll try a new one and add an extra layer of gasket in there as well. Or I could just install that Blazer tank that I ordered and have been staring at for the last few months...hmmmmm...

blazer72 · 01-28-2011, 08:08 PM

added a second gasket, filled the tank, and..................................PRESTO! No more leaks. Now I can paint the truck.

THANKS FELLAS!

breezy · 01-28-2011, 10:17 PM

I have a 71. Do these trucks not have a vent at all? Wouldn't pressure build up inside tank? It does have a tube on yhe passenger side in the corner of cab, is this the vent? If so where does it exit the cab? Since we were on the subject, I thought I would ask.

Shyguy · 01-29-2011, 12:00 AM

Quote:

Originally Posted by breezy

I have a 71. Do these trucks not have a vent at all? Wouldn't pressure build up inside tank? It does have a tube on yhe passenger side in the corner of cab, is this the vent? If so where does it exit the cab? Since we were on the subject, I thought I would ask.

The gas tank on my '71 is vented through the charcoal canister that is just outside the battery in the fender. The vent goes from the tank then to the right corner of the cab and then down through the floor and then to the charcoal canister.

dixietruck71 · 01-29-2011, 12:35 AM

Quote:

Originally Posted by breezy

I have a 71. Do these trucks not have a vent at all? Wouldn't pressure build up inside tank? It does have a tube on yhe passenger side in the corner of cab, is this the vent? If so where does it exit the cab? Since we were on the subject, I thought I would ask.

my factory gas cap is vented their is a small hole from the inside you can suck air through it easily but cant blow throigh it very well at all. i do have the vent tube on the pass side but dont know where it gos either. i dont have a charcoal can on mine but gramps may have yanked it out.

01-26-2011, 07:37 PM	#1
blazer72 Freedom isn't Free Join Date: Oct 2006 Location: OKC Posts: 393	Gas Spillage in Corners Obviously the first thing I did it buy a new gas cap - twice. Tried three different caps, all did the same thing when I take a curve or a right turn, gas spills out the filler neck. WTF? __________________ Previous rides: (worth mentioning) 67 camaro 70 long fleet, 69 short step (stolen), 72 blazer 62 chrysler imperial (hell yeah) 55 and 56 chevy hdtps 72 monte carlo Daily Driver: 86 S-10 Blazer (drive it til I die) and 71 long fleet Projects: 71 suburban, 72 C-30 Dually, 71 Chevy LWB

01-26-2011, 07:42 PM	#2
Monte Carlo Man Registered User Join Date: Feb 2010 Location: Pennsylvania Posts: 85	Re: Gas Spillage in Corners So we are talking about a '72 Blazer here? Last edited by Monte Carlo Man; 01-26-2011 at 07:45 PM.

01-27-2011, 01:50 AM	#4
cheyenne shortstep Registered User Join Date: Jul 2010 Location: Vista Ca. Posts: 2,405	Re: Gas Spillage in Corners I had the same problem but didn't want to give up my old gas cap. So I bought a six dollar cap at Kragens and swapped the gasket.

01-26-2011, 07:55 PM	#6
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,021	Re: Gas Spillage in Corners Have you inspected the filler neck? A lot of times they are cracked from 40+ years of gas filler nozzles being leaned on while filling the tank. __________________ 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 RIP FleetsidePaul

01-26-2011, 08:18 PM	#7
71gmcburb Registered User Join Date: Oct 2010 Location: everett washington Posts: 382	Re: Gas Spillage in Corners check the vent tube had the same problem on my 66 econoline and that was the problem __________________ a wise man once said "There are only two real rules to life... 1 - Don't sweat the small stuff 2 - Everything is small stuff

01-27-2011, 01:33 PM	#8
Constructor1 Registered User Join Date: Jan 2011 Location: Phoenix, AZ Posts: 89	Re: Gas Spillage in Corners I am having the same problem on my 1970. My problem stems from the fact that some "Jackleg" mangled the top of the neck before she was mine. There is only 1 "ear" left for the cap to grab. Has anyone ever replaced just the fill neck? If so how would I go about it?

01-28-2011, 01:18 AM	#10
dixietruck71 Registered User Join Date: Dec 2010 Location: ravensdale washington Posts: 111	Re: Gas Spillage in Corners Trucks don't have vent tubes on the filler neck. WES[/QUOTE] my truck has a vent tube on the filler neck of the stock tank, its he EEC evap emission style tank __________________ 71 gme Sierra Grande lwb. 68 Rambler American 2 door 75 jeep cj5

01-27-2011, 03:55 PM	#11
matthew20061 69' Chevy Stepside Join Date: Mar 2008 Location: Anchorage, Ak Posts: 526	Re: Gas Spillage in Corners Our 70' has the same problem with gas leaking out of the gas cap if its filled all the way, think I'll try the double gasket trick to see if that fixes it. __________________ -Matthew -69' Chevy Custom/10 Shortbed Stepside 2WD "Copperhead" - Restored, 6.0L LQ9 Built. L92 Heads and LS3 Intake with Comp Cam 223/231 .610/.617 112 LSA, 4L60E with Shift Kit and Circle-D 3200 Stall Converter ~Build Thread -1957 Chevy BelAir 2 Door Post Sedan, Full Frame off Restoration done myself - 6.0L with T56 six speed -1957 Chevy BelAir 2 Door Post Sedan - Nearly rust free AK car, Project in the waiting -2003' Chevy Silverado SS AWD 6.0L! - Daily Driver

01-27-2011, 05:42 PM	#12
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Gas Spillage in Corners Yep sounds like a worn neck, either new tank or double the gasket on the cap __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-27-2011, 05:52 PM	#13
blazer72 Freedom isn't Free Join Date: Oct 2006 Location: OKC Posts: 393	Re: Gas Spillage in Corners never thought to double up the gasket. You guys kick ass - I have 3 or 4 caps laying around. cheap fix if it works. thanks fellas. __________________ Previous rides: (worth mentioning) 67 camaro 70 long fleet, 69 short step (stolen), 72 blazer 62 chrysler imperial (hell yeah) 55 and 56 chevy hdtps 72 monte carlo Daily Driver: 86 S-10 Blazer (drive it til I die) and 71 long fleet Projects: 71 suburban, 72 C-30 Dually, 71 Chevy LWB

01-27-2011, 08:42 PM	#14
flashed Registered User Join Date: Oct 2009 Location: canton ga Posts: 12,728	Re: Gas Spillage in Corners I have a new tank and a new cap and it still spills out the neck.I may also try the double gasket idea.

01-27-2011, 09:57 PM	#15
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Gas Spillage in Corners Mine did it also, locking gas cap at a yard sale for $1. I love an old truck. __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-28-2011, 01:23 AM	#17
dixietruck71 Registered User Join Date: Dec 2010 Location: ravensdale washington Posts: 111	Re: Gas Spillage in Corners last week i bought some 3/16" thick gasket material from the auto part store. cut out a gasket and put it over the old one and it works awesome. No more leak. The cap is tight as hell though, but its better than a gas stain on the bed and cab corner. The gasket material was $3.49 and was about 12" x 16" square __________________ 71 gme Sierra Grande lwb. 68 Rambler American 2 door 75 jeep cj5

01-28-2011, 01:39 AM	#18
3118tim Registered User Join Date: Jan 2011 Location: truckee ca Posts: 7	Re: Gas Spillage in Corners looking for 72 blazer rear hatch strikers. Any leads?

01-28-2011, 04:04 AM	#19
shiner2001 Registered User Join Date: Sep 2010 Location: Fort Worth, TX Posts: 222	Re: Gas Spillage in Corners My 72 leaks like a sieve after a fill up too. When I take a right turn I can look in the mirror and just see dollars gurgling out of the filler neck. It's a locking gas cap, which I don't like, so I think I'll try a new one and add an extra layer of gasket in there as well. Or I could just install that Blazer tank that I ordered and have been staring at for the last few months...hmmmmm... __________________ Derek 72 Chevy Cheyenne Super LWB 454 SS LS6 90 GMC Suburban V2500 350 ----------- 64 Chevy El Camino 357 73 Jeep Wagoneer 360 78 Jeep Cherokee 360 79 Scout II 345 88 Jeep Wrangler 4.2L 91 Jeep Wrangler 4.3L 98 Lincoln Mark VIII 4.6L 01 GMC Yukon 5.3L *"If it's not broken, fix it 'till it is!"*



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01-28-2011, 08:08 PM	#20
blazer72 Freedom isn't Free Join Date: Oct 2006 Location: OKC Posts: 393	Re: Gas Spillage in Corners added a second gasket, filled the tank, and..................................PRESTO! No more leaks. Now I can paint the truck. THANKS FELLAS! __________________ Previous rides: (worth mentioning) 67 camaro 70 long fleet, 69 short step (stolen), 72 blazer 62 chrysler imperial (hell yeah) 55 and 56 chevy hdtps 72 monte carlo Daily Driver: 86 S-10 Blazer (drive it til I die) and 71 long fleet Projects: 71 suburban, 72 C-30 Dually, 71 Chevy LWB

01-28-2011, 10:17 PM	#21
breezy Registered User Join Date: Oct 2010 Location: Palaskifield,Mo. Posts: 71	Re: Gas Spillage in Corners I have a 71. Do these trucks not have a vent at all? Wouldn't pressure build up inside tank? It does have a tube on yhe passenger side in the corner of cab, is this the vent? If so where does it exit the cab? Since we were on the subject, I thought I would ask.

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