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Hatracks Samba Member
Joined: July 10, 2016 Posts: 659 Location: Renton, WA
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Posted: Sun Jul 30, 2017 8:08 am Post subject: Gas splashing out cap 73 super |
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When I got my super the gas lines had recently been replaced and gone through and the previous owner had deleted all of the vents and everything. In doing so they put in a stant gas cap to vent that seems to fit well but on turns I get gas sloshing out.
What is the best way to put in a vent (the metal line is gone that went to the back) so I can go back to an original gas cap and avoid the fuel spillage. _________________ 73 Super Build |
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Bama Dave Samba Member
Joined: April 19, 2015 Posts: 963 Location: Alabama
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Posted: Sun Jul 30, 2017 1:38 pm Post subject: Re: Gas splashing out cap 73 super |
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This may or may not help: https://www.thesamba.com/vw/forum/viewtopic.php?t=199825
Definitely need to run vent lines ...not necessarily to the rear....just run it up into the dash area, then down to front to allow spillage to go out...and get a proper cap. _________________ David Richerson
1970 Beetle
1971 Super
1972 Baja
hellthorne wrote: |
First off, I know i made stupid decisions that led to my predicament, so while you are welcome to tell me that I am an idiot for doing the things I did, please know that I am already aware of this. |
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Hatracks Samba Member
Joined: July 10, 2016 Posts: 659 Location: Renton, WA
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Posted: Sun Jul 30, 2017 2:38 pm Post subject: Re: Gas splashing out cap 73 super |
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I have an original cap I just swapped it for the stant one that was referenced in some thread that is a vented cap. I threw the original back on and I guess I will just run a vent down by the wheel. _________________ 73 Super Build |
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heimlich VWNOS.com
Joined: November 20, 2016 Posts: 6558 Location: Houston, Texas
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Posted: Sun Jul 30, 2017 10:24 pm Post subject: Re: Gas splashing out cap 73 super |
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Take some pictures. Others may be able to offer some suggestions.
For a standard you need the vent lines from the tank. A super may have similar reasons. _________________ www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
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Hatracks Samba Member
Joined: July 10, 2016 Posts: 659 Location: Renton, WA
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Posted: Mon Jul 31, 2017 6:29 am Post subject: Re: Gas splashing out cap 73 super |
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I already put the vent line back in, just ran it down to the front wheel. _________________ 73 Super Build |
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unclewede Samba Member
Joined: May 01, 2015 Posts: 374 Location: Oxnard, CA
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Posted: Mon Jul 31, 2017 9:59 am Post subject: Re: Gas splashing out cap 73 super |
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Hatracks wrote: |
I already put the vent line back in, just ran it down to the front wheel. |
Do you get flames on hot days??? |
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heimlich VWNOS.com
Joined: November 20, 2016 Posts: 6558 Location: Houston, Texas
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Posted: Mon Jul 31, 2017 10:23 am Post subject: Re: Gas splashing out cap 73 super |
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Hatracks wrote: |
I already put the vent line back in, just ran it down to the front wheel. |
I tried something similar. When I filled up the gas tank and parked the car in such a way gasoline would drain out the front of the car. I'd leave puddles everywhere I went. Needless to say I put everything back together with the charcoal canister. _________________ www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
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Hatracks Samba Member
Joined: July 10, 2016 Posts: 659 Location: Renton, WA
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Posted: Mon Jul 31, 2017 12:41 pm Post subject: Re: Gas splashing out cap 73 super |
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kawfee wrote: |
Hatracks wrote: |
I already put the vent line back in, just ran it down to the front wheel. |
I tried something similar. When I filled up the gas tank and parked the car in such a way gasoline would drain out the front of the car. I'd leave puddles everywhere I went. Needless to say I put everything back together with the charcoal canister. |
I have a pretty good working knowledge of expansion, static head, and suction so routed the line appropriately. Not to worried. _________________ 73 Super Build |
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heimlich VWNOS.com
Joined: November 20, 2016 Posts: 6558 Location: Houston, Texas
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Posted: Mon Jul 31, 2017 3:10 pm Post subject: Re: Gas splashing out cap 73 super |
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It sounds like you've got it then. Good to hear. _________________ www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
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Bleu 72 Super Samba Member
Joined: November 17, 2020 Posts: 11 Location: South-central PA
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Posted: Thu Jul 29, 2021 6:59 pm Post subject: Re: Gas splashing out cap 73 super |
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Gas was splashing out and running down along the front fender (on my beautiful paint job).
The guy who expertly restored my Beetle thought a new gas cap would fix this. It didn't. He was sure everything else was right, so he said try (another) new gas cap. I was skeptical, but... Now no more leakage or gas smell.
Lesson: It could be the gas cap, even if you've tried a new one.
Note: These new gas caps were surely third-party parts. I think you can never be sure when you buy third-party parts. Pretty sure you can't order from Wolfsburg any more. |
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diamondblue1969 Samba Member
Joined: February 19, 2010 Posts: 95 Location: ONTARIO
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Posted: Fri Jul 30, 2021 9:09 am Post subject: Re: Gas splashing out cap 73 super |
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I had a leaky Stant on my 72 super , I put the gasket from it on an original VW cap, it's OK now ! |
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ashman40 Samba Member
Joined: February 16, 2007 Posts: 15976 Location: North Florida, USA
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Posted: Fri Jul 30, 2021 9:38 am Post subject: Re: Gas splashing out cap 73 super |
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The stock gas cap was solid and not vented. You want the gas cap to maintain a water (gas) tight seal. The placement of the filler so close to the tank means hard turns can throw liquid fuel up against the inside of the cap. A vented cap will spill liquid fuel down the side of the car.
But the tank also needs to breath. If left fully sealed it can create a vacuum as the fuel is consumed and the level goes down. This can actually stop or negatively impact fuel flow to the engine. On the flip side, a car left in the sun will start to heat up and the gasoline will expand increasing tank pressure. This could actually push fuel out the rear flooding the carb if there isn't a check valve somewhere in the fuel lines.
So basically you need a vent to the gas tank, but it should NOT be at the gas cap. The vent lines should route up higher than the tank to limit liquid fuel from flowing out the end of the vent line. VW came up with some elaborately hosed systems that were generally basic in design. Earlier model years (pre-emissions) just ran the tank vent hose out of the trunk and down near the front wheels as described above. Spilling fuel onto the ground in the '60s was no big thing .
Just be aware that venting raw gasoline fumes into the atmosphere is one of the main reasons for emission laws. If you live in a location that requires your car to pass emission test, you will likely fail with a hacked system that dumps raw gasoline fumes out of the car. If your car is old enough to be exempt... then do what you need to do to avoid liquid gasoline from spilling onto the ground.
Oh, and if it is not understood... liquid gasoline will catch fire (flammable), but gasoline fumes are explosive (combustible). Keep any flames or sparks away from your vent hoses! And if you keep your Beetle in the closed garage in the hot summer... expect that gasoline smell to linger. And don't have an open flame in the garage with the doors closed (gas water heater?)! _________________ AshMan40
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'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31271 Location: Hot Arizona
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Posted: Fri Jul 30, 2021 1:07 pm Post subject: Re: Gas splashing out cap 73 super |
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n the mid-1990s, my garage housed my 1988 Mazda truck and my 1971 Super Convertible. I had a gas odor in the garage. I finally found that the Mazda mechanical fuel pump intermittently leaked, so replaced that, thought I solved the odor issue.
Nope: the factory gas cap was also leaking on the 1971 Convertible, its rubber gasket. Back in those days the local Pep Boys stocked its replacement cap. _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Lemons 4 Gigi Samba Member
Joined: May 18, 2020 Posts: 89 Location: Slidell, LA
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Posted: Sun Aug 01, 2021 4:08 pm Post subject: Re: Gas splashing out cap 73 super |
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Had this issue but a replacement stock style gas cap fixed it. I believe it was an IAP cap from RockAuto... _________________ 1971 Super Convertible "Gigi", Lemon Yellow (Factory Zitronengelb L-11E)
1970 Dodge Challenger R/T "Jezzy", 440, 4-spd, pLuM cRaZy!
A couple of Jeeps.. |
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Tim Donahoe Samba Member
Joined: December 08, 2012 Posts: 11739 Location: Redding, CA
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Posted: Mon Aug 02, 2021 8:52 am Post subject: Re: Gas splashing out cap 73 super |
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It was not a difficult, or time consuming task to replace the original venting system on my 1974 Super Beetle. The fumes eventually vent to the charcoal filter, and from there to the carburetor. No fumes of fuel is vented to the atmosphere in front of my car.
Tim _________________ Let's do the Time Warp again!
Richard O'Brien |
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