Locking Fuel Cap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

scoutcamper · 11-07-2012, 12:21 PM

Hey all,

I have a "new(previouly ignored)" issue on my 71 build. the locking fuel cap that i purhased from chevyduty (will link below) Leaks. When i go around a corner gas pours out of the fuel cap. We found a "non vented fuel cap" from a 72' parts truck that we picked up awhile back, and that does the same thing. Any suggestions to not leak fuel every time you make a turn?

the cap i purchased is http://www.classicparts.com/1938-71-.../#.UJqKBYaz6o8

*Mister-B* · 11-07-2012, 12:44 PM

Quote:

Originally Posted by scoutcamper

Hey all,

I have a "new(previouly ignored)" issue on my 71 build. the locking fuel cap that i purhased from chevyduty (will link below) Leaks. When i go around a corner gas pours out of the fuel cap. We found a "non vented fuel cap" from a 72' parts truck that we picked up awhile back, and that does the same thing. Any suggestions to not leak fuel every time you make a turn?

the cap i purchased is http://www.classicparts.com/1938-71-.../#.UJqKBYaz6o8

Are you topping off too much gas when you fill up? LMC sells a locking gas cap. Maybe you could try that as well.
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scoutcamper · 11-07-2012, 01:22 PM

I have to leave the tank 1/4 low when i fuel it up or it dumps fuel, so im not putting to much gas in it...

**Stocker** · 11-07-2012, 02:19 PM

Got my locking cap from NAPA, p/n 703-1113, no leaks. It's actually my second cap from them, the first lasted many years before the seal finally rotted and gas started sloshing out on right-hand corners.

ChevLoRay · 11-07-2012, 03:49 PM

scoutcamper · 11-07-2012, 05:24 PM

Guys-this looks just like the cap i took off of the 72 donor truck, it did not in fact seat itself correctly on the 71'

. I will go to napa today or tommorow and compare the 2 caps....

1972SUPERSB · 11-07-2012, 06:13 PM

Quote:

Originally Posted by Stocker

Got my locking cap from NAPA, p/n 703-1113, no leaks. It's actually my second cap from them, the first lasted many years before the seal finally rotted and gas started sloshing out on right-hand corners.

I think I tried this gas Cap. Does it move up and down once you turn and tighten it? Seems like the one i bought was a little loose once you turn and tighten It. I'm having a hard time finding a cap that fits correctly. Locking or non locking.
Posted via Mobile Device

original-71 · 11-07-2012, 06:48 PM

very nice looking cap too bad it leaks

**Stocker** · 11-07-2012, 06:56 PM

Quote:

Originally Posted by 1972SUPERSB

I think I tried this gas Cap. Does it move up and down once you turn and tighten it? Seems like the one i bought was a little loose once you turn and tighten It.

It doesn't turn at all, you just press it straight down onto the filler neck and two tangs lock it in place. Internal spring(s) keep outward pressure on it to maintain proper seal. You can press it downward against the spring(s) and it will push back up as you take your hand off it.

Gas Cap - Locking
Part Number: BK 7031113
Product Line: Balkamp
IMPORTANT INFO: Boxed Product

**Already Gone** · 11-07-2012, 07:06 PM

Quote:

Originally Posted by Stocker

It doesn't turn at all, you just press it straight down onto the filler neck and two tangs lock it in place. Internal spring(s) keep outward pressure on it to maintain proper seal. You can press it downward against the spring(s) and it will push back up as you take your hand off it.

Gas Cap - Locking
Part Number: BK 7031113
Product Line: Balkamp
IMPORTANT INFO: Boxed Product

The first purchase I made after I bought my truck in 2001 was one of these gas caps and it stil on the truck doing its job. My reason for buying the locking cap was I didn't want someone to steal my gas or sweeten the gas with a little sugar or some other foreign material.
Posted via Mobile Device

Billett · 11-07-2012, 07:44 PM

Paint's faded on mine, but I'm pretty sure I have that cap as well on my 68. I haven't noticed any leaks yet.

99-LS1-SS · 11-07-2012, 08:13 PM

I WILL be getting one of those locking caps. Thank you for the information.

dlh760 · 11-07-2012, 10:27 PM

I tried that exact locking gas cap on my truck because original leaked on right turns. That cap leaked worse than original so I put a seal about 1/4" thick over the gas cap seal and it doesn't leak anymore.
Posted via Mobile Device

**Stocker** · 11-07-2012, 10:53 PM

Quote:

Originally Posted by dlh760

I put a seal about 1/4" thick over the gas cap seal and it doesn't leak anymore.

Interesting, glad you could fix it! What did you use for the thicker seal?

dlh760 · 11-07-2012, 11:02 PM

I work in a hydraulic shop and it is just a basic rod protector seal we have that was the right size to fit the cap. It takes some effort to get the cap on now but it doesn't leak
Posted via Mobile Device

Sicklajoie · 11-07-2012, 11:02 PM

The only thing I hate about that cap is that it says Made in May-he-ko.

Square_78 · 11-07-2012, 11:40 PM

I got a locking cap locally from KMS. It's prob the same one as LMC would have. It's shiney chrome and rounded and looks good. I have the one from napa on my 78 and it's ugly. Neither of them leak any fuel. The one from KMS seems a little weak on the sealing department, but so far it's not leaking any gas
Posted via Mobile Device

bobs409 · 11-08-2012, 08:04 AM

Quote:

Originally Posted by dlh760

I tried that exact locking gas cap on my truck because original leaked on right turns. That cap leaked worse than original so I put a seal about 1/4" thick over the gas cap seal and it doesn't leak anymore.
Posted via Mobile Device

I have the same situation on my 71. Same cap on both my 69 & 71 but had leaks only on that truck. For now, I found a plastic cap of some type that fit over the filler neck and the gas cap goes over it. (acts like an extension of the rubber gasket) I tried to glue it in place but that horrible ethenol won't allow that. It stopped the leak for now until I can figure out a better plan.

11-07-2012, 12:21 PM	#1
scoutcamper Registered User Join Date: Apr 2011 Location: Redding, CA Posts: 23	Locking Fuel Cap Hey all, I have a "new(previouly ignored)" issue on my 71 build. the locking fuel cap that i purhased from chevyduty (will link below) Leaks. When i go around a corner gas pours out of the fuel cap. We found a "non vented fuel cap" from a 72' parts truck that we picked up awhile back, and that does the same thing. Any suggestions to not leak fuel every time you make a turn? the cap i purchased is http://www.classicparts.com/1938-71-.../#.UJqKBYaz6o8

11-07-2012, 01:22 PM	#3
scoutcamper Registered User Join Date: Apr 2011 Location: Redding, CA Posts: 23	Re: Locking Fuel Cap I have to leave the tank 1/4 low when i fuel it up or it dumps fuel, so im not putting to much gas in it...

11-07-2012, 02:19 PM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Re: Locking Fuel Cap Got my locking cap from NAPA, p/n 703-1113, no leaks. It's actually my second cap from them, the first lasted many years before the seal finally rotted and gas started sloshing out on right-hand corners. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 11-07-2012 at 02:27 PM.

11-07-2012, 03:49 PM	#5
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Locking Fuel Cap __________________ 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.

11-07-2012, 05:24 PM	#6
scoutcamper Registered User Join Date: Apr 2011 Location: Redding, CA Posts: 23	Re: Locking Fuel Cap Guys-this looks just like the cap i took off of the 72 donor truck, it did not in fact seat itself correctly on the 71' . I will go to napa today or tommorow and compare the 2 caps....

11-07-2012, 06:48 PM	#8
original-71 ///Relaxed Atmosphere Join Date: May 2010 Location: Houston,Tx Posts: 1,266	Re: Locking Fuel Cap very nice looking cap too bad it leaks __________________ 71-Cheyenne Super (E.C.E Static Drop 4.5/7". Intro Rally's 20X8.5 5" B.S 255/35/20 (F) 20X10 5.25 B.S 275/35/20 (R) 87-Silverado Static Drop 5/7" Raceline Explosion 5 22X8.5 (F) 22X10 (R) hector _________________________________ 1971 Chevrolet Cheyenne Super 1987 Chevrolet Silverado 2006 Ford Mustang GT 2012 Toyota 4-Runner 2014 Dodge Ram 1500 Sport Crew Cab

11-07-2012, 07:44 PM	#11
Billett Registered User Join Date: Jun 2012 Location: Pittsgrove, NJ Posts: 1,502	Re: Locking Fuel Cap Paint's faded on mine, but I'm pretty sure I have that cap as well on my 68. I haven't noticed any leaks yet. __________________ Will 1968 C10 - Project Texa Go 6.0/4L80e 2003 Mitsubishi Lancer Evolution 2002 Ford Excursion 7.3L 2024 Toyota Sienna

11-07-2012, 08:13 PM	#12
99-LS1-SS Registered User Join Date: Mar 2011 Location: Oak Ridge NC Posts: 957	Re: Locking Fuel Cap I WILL be getting one of those locking caps. Thank you for the information. __________________ My 1972 2WD Blazer build 1984 K10 beater truck

11-07-2012, 10:27 PM	#13
dlh760 Registered User Join Date: Oct 2012 Location: valley center,ca Posts: 124	Re: Locking Fuel Cap I tried that exact locking gas cap on my truck because original leaked on right turns. That cap leaked worse than original so I put a seal about 1/4" thick over the gas cap seal and it doesn't leak anymore. Posted via Mobile Device __________________ 68 Chevy c10 longbed 307 with 305 H.O. heads,edelbrock performer intake,edelbrock performer plus cam,hei,Holley 650 double pumper and th400. Daily driver. It hauls butt,it hauls my butt where I need to go

11-07-2012, 11:02 PM	#15
dlh760 Registered User Join Date: Oct 2012 Location: valley center,ca Posts: 124	Re: Locking Fuel Cap I work in a hydraulic shop and it is just a basic rod protector seal we have that was the right size to fit the cap. It takes some effort to get the cap on now but it doesn't leak Posted via Mobile Device __________________ 68 Chevy c10 longbed 307 with 305 H.O. heads,edelbrock performer intake,edelbrock performer plus cam,hei,Holley 650 double pumper and th400. Daily driver. It hauls butt,it hauls my butt where I need to go

11-07-2012, 11:02 PM	#16
Sicklajoie The Niner Join Date: Nov 2010 Location: Broad Brook, CT Posts: 2,500	Re: Locking Fuel Cap The only thing I hate about that cap is that it says Made in May-he-ko. __________________ "A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/

11-07-2012, 11:40 PM	#17
Square_78 Registered User Join Date: Mar 2012 Location: Okanagan Valley, BC, Canada Posts: 1,237	Re: Locking Fuel Cap I got a locking cap locally from KMS. It's prob the same one as LMC would have. It's shiney chrome and rounded and looks good. I have the one from napa on my 78 and it's ugly. Neither of them leak any fuel. The one from KMS seems a little weak on the sealing department, but so far it's not leaking any gas Posted via Mobile Device __________________ #teamlongbed "I refuse to go disc brakes. I actually love drum brakes. It makes for an adventure." - 50bomb 1978 Chevy shop truck - static 6/8" 1970 GMC 1500 - Accuair eLevel Resto-mod http://67-72chevytrucks.com/vboard/s...d.php?t=537497



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