Gas caps - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**StingRay** · 08-29-2002, 01:11 AM

Stoonboy has been looking for a stainless original gas cap to fit his 71. Bowtie got him one and it didn't fit, I gave him one from a 69 and it didn't fit, I found another that definetely fit my 72 and behold it doesn't fit his 71. Randy's seems to use a larger diameter cap. Can anybody shed any light on this mystery?

*Gee_Emm* · 08-29-2002, 01:16 AM

71 and 72 have different sized filler necks from the 67-70's

**StingRay** · 08-29-2002, 01:39 AM

OK then why does my 72 use a different cap than his 71. My truck had 62,000 original miles on it when I got it and still had the original tank in it? When I bought a new locking cap for it a couple of months ago I told them it was a 72 and they gave me the smaller cap that does not fit Randy's 71 and does fit the older stuff and my 72. Something still seems strange here.

ChevLoRay · 08-29-2002, 08:13 AM

Maybe someone changed the upper part of the filler neck before he bought it. Maybe it isn't even a GM part that got used. Maybe it has been wrecked in its' past life, and the repair shop grabbed what was available and handy. This is just a guess.

My '69 still has the original stainless cap, although I installed a locking cap from NAPA, on September 11, of last year. Seems that I got spooked when I saw the lines at the gas stations when the public when nuts about gas shortages and price hikes. I didn't want anyone stealing my gas. I'm glad I was wrong.

da-burb · 08-29-2002, 12:38 PM

half ton and 3/4 ton trucks use different filler necks. I tried a C10 cap on my C20 and it wasn't large enough to hook on the tabs. I have seen a few C10's that had the C20 tanks swapped into them too.
I think the C-10 caps are the same 67-72. The difference is whether they are vented(67-70) or sealed (71-72)caps for the emissions control.

palallin · 08-29-2002, 01:41 PM

Has anybody ever found one that will not let gas slop out all over the side of the cab? I've never had a cap that wouldn't, and I've used many.

woodrow59 · 08-29-2002, 05:22 PM

palallin ,,,, got my chrome one at PepBoys but don't remember the brand. Since you don't have a PepBoys close to St. James (unless things have changed since I've been there) I'll stop by there and see what brand they have and post it here.

*Gee_Emm* · 08-29-2002, 10:16 PM

FROM GM PARTS BOOK

CAP, GASOLINE TANK FILLER

3927086 67-72 ALL CK MODELS W/SIDE MOULDING EQUIP OR C.S.T. .....CHROME

3914958 68-72 ALL CKG MODELS EXC SIDE MLDG OR C.S.T./

3975177 71 10-15 ALL

-------------------------------------------------------------------------------

I don't see how 1/2 and 3/4 tons would have different tanks??????

They list filler necks in here too and they don't show different ones for 3/4 tons

08-29-2002, 01:11 AM	#1
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Gas caps Stoonboy has been looking for a stainless original gas cap to fit his 71. Bowtie got him one and it didn't fit, I gave him one from a 69 and it didn't fit, I found another that definetely fit my 72 and behold it doesn't fit his 71. Randy's seems to use a larger diameter cap. Can anybody shed any light on this mystery? __________________ Saskatoon, Saskatchewan Canada

08-29-2002, 01:39 AM	#3
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	OK then why does my 72 use a different cap than his 71. My truck had 62,000 original miles on it when I got it and still had the original tank in it? When I bought a new locking cap for it a couple of months ago I told them it was a 72 and they gave me the smaller cap that does not fit Randy's 71 and does fit the older stuff and my 72. Something still seems strange here. __________________ Saskatoon, Saskatchewan Canada

08-29-2002, 08:13 AM	#4
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Maybe someone changed the upper part of the filler neck before he bought it. Maybe it isn't even a GM part that got used. Maybe it has been wrecked in its' past life, and the repair shop grabbed what was available and handy. This is just a guess. My '69 still has the original stainless cap, although I installed a locking cap from NAPA, on September 11, of last year. Seems that I got spooked when I saw the lines at the gas stations when the public when nuts about gas shortages and price hikes. I didn't want anyone stealing my gas. I'm glad I was wrong. __________________ 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.

08-29-2002, 12:38 PM	#5
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	half ton and 3/4 ton trucks use different filler necks. I tried a C10 cap on my C20 and it wasn't large enough to hook on the tabs. I have seen a few C10's that had the C20 tanks swapped into them too. I think the C-10 caps are the same 67-72. The difference is whether they are vented(67-70) or sealed (71-72)caps for the emissions control. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

08-29-2002, 01:41 PM	#6
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,239	Has anybody ever found one that will not let gas slop out all over the side of the cab? I've never had a cap that wouldn't, and I've used many. __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

08-29-2002, 01:16 AM	#2
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 4,002	71 and 72 have different sized filler necks from the 67-70's

08-29-2002, 05:22 PM	#7
woodrow59 OzarkHillbilly in Atlanta Join Date: May 2002 Location: Douglasville, Ga. Salem, Mo. Posts: 386	palallin ,,,, got my chrome one at PepBoys but don't remember the brand. Since you don't have a PepBoys close to St. James (unless things have changed since I've been there) I'll stop by there and see what brand they have and post it here. __________________ 72 custom/10 LWB 68 Longhorn C20 Custom Camper (sold)

08-29-2002, 10:16 PM	#8
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 4,002	FROM GM PARTS BOOK CAP, GASOLINE TANK FILLER 3927086 67-72 ALL CK MODELS W/SIDE MOULDING EQUIP OR C.S.T. .....CHROME 3914958 68-72 ALL CKG MODELS EXC SIDE MLDG OR C.S.T./ 3975177 71 10-15 ALL ------------------------------------------------------------------------------- I don't see how 1/2 and 3/4 tons would have different tanks?????? They list filler necks in here too and they don't show different ones for 3/4 tons



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