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Gas Cap

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    Posted: 28 Aug. 2018 at 9:32pm
Well I put a better seal in my gas cap to stop the right turn spill but now
my gas tank doesn't leak! It also doesn't get any air it and starts to pull
a vacuum which other problem all in it self.
 
I got a new cap once before and it leaked as bad as the one a already had,
does anyone one sale a good cap that doesn't leak and vents correctly?
 
I hate paying for gas and half of it runs down the side of my jeep and
having the engine die due to the lack of gas. Also I'm afraid of crushing
the gas tank like a beer can with the vacuum it is pulling.
RICH

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Post Options Post Options   Thanks (0) Thanks(0)   Quote smfulle Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug. 2018 at 9:35pm
Honestly, on every trail ride I go on, every stock configured flat fender leaks fuel when parked with the left side low. Usually solved by parking with the left side up.
I know, not very helpful but true.
Stan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1947-cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug. 2018 at 10:24pm
Has anyone used the gas cap 640594 from walcks?
Is it a piece of sh*t or a good brand cap that vents and
doesn't leak too.
RICH

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee (MN) Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug. 2018 at 10:34pm
Back in about 2010 I purchased a new cap from Walcks, the seal or gasket on it melted to nothing on the first fill of gas so I made a gasket from a sheet of cork gasket material from Napa (Thank you Chi-Coms) on the original cap that fit the tank better as well!.... 2014 I replaced the tank as it was rusty and plugging up things down the line, so I went with a new cap again, the cap has held up well with no issues, so I’ll assume between 2010 and 2014 the Chi-Coms corrected the crap gasket/seal with one that is correct for American gas and yes as Stan said, a full tank on a left lean they all seem to weep a bit....

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Bob W Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug. 2018 at 8:40pm
An original gas cap is the only solution. It has two valves inside. One is designed to let air in so there is never a vacuum in the tank. The other releases under pressure, so when it gets hot excess pressure is relieved, but gas doesn't spill out on a side hill.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stev Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 4:08pm
Bob W.

That is very cool information on the original gas cap!  Thanks for sharing!

Makes me wonder if the reproduction caps are made like the originals with the two valves inside.

Stev
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rocnroll Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 4:29pm
Bob, what info do you have on replacement sources?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeeper50 Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 7:39pm
I keep my fuel level out of the filler neck when filling up, it prevent the right turn slosh
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 3A Steve Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 7:46pm
My tank leaked like crazy while I was in the Henry Mountains and then on Elephant Hill in Utah. It was to the point I was afraid I wouldn't make it back. Tried a NAPA cap in Colorado. That didn't do any better. Ordered a Walcks cap. Same thing. finally ordered some jerry can spout gaskets off of ebay. Put them in my cap. They aren't perfect but they are pretty close. No air lock problems and minimal leakage. They are only a couple of bucks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob W Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 8:36pm
Originally posted by rocnroll rocnroll wrote:

Bob, what info do you have on replacement sources?

Unfortunately I have no information about replacement gas caps.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RICKG Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 8:54pm
You guys in build stage might wanna vent the tank to the oil bath air filter M38 style.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rocnroll Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 9:26pm
Originally posted by Bob W Bob W wrote:

Unfortunately I have no information about replacement gas caps.


Ok thanks



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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1947-cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 10:28pm
3a Steve.
I used the gaskets you talked about and they worked great at stopping the leak,
but caused the vacuum problem I'm having now.
RICH

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1947-cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug. 2018 at 11:08pm
I check under rock-auto to see what they had.
They showed a acdelco 12f7 cap, which I looked
up on ebay and there are a bunch of them out
out there too. I  have order one and will let you
all know how it works or if is just another piece
of sh*t being sold.
RICH

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rick G Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug. 2018 at 12:43am
I can’t speak to which cap works best, but coincidentally this past weekend I had a gas cap failure.  I was climbing a steep grade in a private area of Palo Duro Canyon (where they hold the Jeep Jamboree) and yes, leaning to the left spilling gas as I went up the hill.  I slid over into the wall of the road on the driver’s side, scraping pretty good along the way.  When I reached to top of the climb, I noticed the scraping had completely unscrewed my gas cap.  Took me about 10 minutes to find it buried in the dirt and rocks of the trail.  Brushed it off and screwed it back on.  Didn’t think anymore about it until about an hour later when the jeep quit runningConfused





Thought it was vapor locking at first cuz it was 100 deg and the fuel filter was completely dry.  Then it hit me😖

Anyway, mine is a very old locking gas cap that had the key broke off in it so it was always “unlocked”.  I took it apart and had new keys made for the tumbler so that it would be locked in place and couldn’t be twisted off by the rocks or dirt embankments.  While disassembled, I made new gaskets for it out of Fel-Pro material appropriate for gasoline.  Also bent the locking tabs a little to tighten it up a bit.  I suspect it will still leak when leaning to the left, but at least it won’t be as easy to twist off on the rocks now👍🏻  You sure don’t want this to happen.  I can tell you that you can only go 2.3 miles on a Gatorade bottle acting as a gas tank😉
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1947-cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep. 2018 at 1:07pm
CAN SOMEONE TELL ME IF THIS IS A LARGE OR SMALL MOUTH TANK. I JUST RECIEVE MY VENTED CAP AND IT DOESN'T FIT THE TANK.
RICH

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ol' Unreliable Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep. 2018 at 10:22pm
"Large" or "small" mouth only applies to WWII jeeps.  CJ-2A tanks should be all the same.  Where did you get the cap?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1947-cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep. 2018 at 10:46pm
I looked it up on rock-auto to get a part number and order it off ebay.
RICH

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