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April 12, 2021, 08:22:02 PM

Petrol tank breather

This is a discussion for the topic Petrol tank breather on the board Beach Buggy Engine and Exhaust Help.

Author Topic: Petrol tank breather  (Read 314 times)

this user is online hustler

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on: April 06, 2021, 07:39:38 PM
Hi guys. Got to fit a new petrol tank. What’s the best thing to do with the skinny breather pipe at front of tank?  If I blank it off will I get an air lock. Any advice please.
Roy


this user is online Doon L001

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Reply #1 on: April 06, 2021, 07:59:51 PM
Mine runs out to under the front wing low down with a gadget fitted to stop fuel but let air through.

Think I got it from Demontweeks it's to stop fuel on rally cars that roll. Not cheap but you're likely to leak fuel without one so safety first

I think Peter runs his up the screen surround so gravity stops fuel coming out.

Another alternative is a cap with a breather and then you should be able to block off the pipe. Didn't do it on mine as it's under a bonnet so don't want it filling with fumes.

Dave
« Last Edit: April 06, 2021, 08:02:48 PM by Doon L001 »
Dave - Doon LWB 1st one made  ;-)up Name "Weather Permitting"


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Reply #2 on: April 06, 2021, 08:04:39 PM
I wondered if I could run a pipe up high. Was worried about fumes tho. Thanks for your input.


this user is online Doon L001

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Reply #3 on: April 06, 2021, 08:08:19 PM
https://www.demon-tweeks.com/uk/mocal-in-line-fuel-tank-breather-valve-23340/

Here's a link to the valve 
My breather is at the back of the filler neck and originally peed fuel out if you accelerated with a full tank, this cured it.
Expensive but paid for in the fuel I would have lost plus the fire risk.
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Reply #4 on: April 06, 2021, 08:14:57 PM
 ;-)up


this user is offline Paul1953

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Reply #5 on: April 07, 2021, 07:41:59 AM
Very rare but I have seen a fuel tank two times that have collapsed inwards due to vacuum created when the breather was blocked. Both carburetted engines and not beetles.


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Reply #6 on: April 07, 2021, 07:47:41 AM
I've always just sealed up any breathers and drilled a tiny hole on the cap, old school I know but I like to keep things simple.
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Reply #7 on: April 07, 2021, 07:49:41 AM
Very rare but I have seen a fuel tank two times that have collapsed inwards due to vacuum created when the breather was blocked. Both carburetted engines and not beetles.

I can across that once on a Hillman Avenger but the tank was made of something not much thicker than tinfoil.
Photos printed on genuine ILFORD® paper, sent from a Commodore VIC 20.

"Ah, Beach Buggies, sure, just a quick cheap way of getting a few more years out of a rusty Beetle. You can throw one together in a weekend." anon.


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Reply #8 on: April 07, 2021, 10:58:18 AM
Didn’t think it would be a good idea just to block it off. Like the idea of drilling cap. Did see some one way valves for motorcycles on flea at. Whether they would do the job. One way to find out I guess. Rather do the job once save having to remove screen and bonnet to many times.


this user is online Dave DND

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Reply #9 on: April 07, 2021, 11:06:45 AM
I had a play with breathers over on my build thread

http://www.beachbuggy.info/index.php/topic,20.msg91535.html#msg91535

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Reply #10 on: April 07, 2021, 11:17:13 AM
Drilling the cap works on centre caps but front or side ones get surge against them when driving so you may get seepage. The original design is up above and across the dash and back to the front then down below the tank so if turned over at any angle it will not syphon out.


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Reply #11 on: April 07, 2021, 11:29:40 AM
Drilling the cap works on centre caps but front or side ones get surge against them when driving so you may get seepage. The original design is up above and across the dash and back to the front then down below the tank so if turned over at any angle it will not syphon out.

Sure, I've only ever had centre fill. A few buggies caught fire back in the day after quite minor crashes, petrol from front filler, vented or not spilling onto hot bulbs in broken indicator lights, headlights etc.
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Reply #12 on: April 07, 2021, 04:20:42 PM
All interesting stuff chaps. Thanks for your input. My tank will have side fill back towards windscreen. So I might try one of those motorbike breathers run pipe back over tank up over dash then back down to front and see how that goes


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Reply #13 on: April 07, 2021, 04:22:39 PM
What a great forum this is. Always a wealth of useful information and tips from you guys. Thanks.  ;-)up


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Reply #14 on: April 10, 2021, 07:27:42 AM
If you have complete access to the tank now. Car builder solutions do a bolt in roll over, breather valve.

Looks much neater and "easier" to install than using the inline thingy for the breather pipe.

https://www.carbuilder.com/uk/fuel-tank-breather-valve

Arran
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