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| Fuel Tank Breather Hoses https://www.ausmini.com/forums/viewtopic.php?f=2&t=95407 |
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| Author: | Jenk [ Wed May 17, 2017 5:13 pm ] |
| Post subject: | Fuel Tank Breather Hoses |
Hey Guys, My fuel tanks have a length of plastics breather tubing which both of them exit through a hole in the battery box to the underside of the car... today after driving it I noticed what I thought was the odd drop of fuel come out of the hose(s) and got concerned! I also noticed vapour exiting from them which I'm sure is normal (that's what they're there for right)... So question is should these tubes be exiting from the top of tanks through the battery box to the underside of car or should they be routed differently and should fuel be exiting from them? I usually don't put more than 5 litres in each tank but today I put 10 in each... not that this should cause them to leak. cheers |
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| Author: | gtogreen1969 [ Wed May 17, 2017 5:20 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
They should cross over. The left tank breather exits next to the battery hole. The right tank breather exits next to the main fuel line. |
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| Author: | Jenk [ Wed May 17, 2017 5:27 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
gtogreen1969 wrote: They should cross over. The left tank breather exits next to the battery hole. The right tank breather exits next to the main fuel line. Thanks... so currently the left tank exits in the correct place but the right tank doesn't as it exits through the same hole in battery box but if it did exit on the other side next to main fuel line would that make any difference to the leaking you think?? |
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| Author: | gtogreen1969 [ Wed May 17, 2017 5:31 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Having them cross over helps as the hose has to rise an inch or so to be held by the tabs under the parcel shelf. |
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| Author: | Jenk [ Wed May 17, 2017 5:43 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
gtogreen1969 wrote: Having them cross over helps as the hose has to rise an inch or so to be held by the tabs under the parcel shelf. Aren't the tabs only fitted to an S? my deluxe doesn't have them... but that's cool that's still very helpful... thanks gtogreen1969 |
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| Author: | gtogreen1969 [ Wed May 17, 2017 6:19 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Jenk wrote: gtogreen1969 wrote: Having them cross over helps as the hose has to rise an inch or so to be held by the tabs under the parcel shelf. Aren't the tabs only fitted to an S? my deluxe doesn't have them... but that's cool that's still very helpful... thanks gtogreen1969 The extra tabs were only fitted to cars with twin tanks. If you are fitting twins to another car then just use something else to hold the crossover tubes under the parcel shelf. |
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| Author: | rodmac [ Wed May 17, 2017 6:28 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Are the breathers passing out through the battery box or behind the battery box? If it's through the battery box then I'd move it by either running the RH tank breather tube across the boot and out the standard hole next to the LH tank with the LH tank breather or making another hole and crossing them. Cheers Rod |
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| Author: | miniron [ Wed May 17, 2017 6:34 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
The tank vent tubes must exit to the opposite side of the boot and they must be fixed to the underside of the parcel shelf. Why? If you park on the LH side of the road with a steep camber the fuel in the RH tank flows across to the LH tank via the tank interconnecting pipe. If the LH tank pipe exits on the LHS fuel will overflow from the LH tank vent tube if both tanks are full. Visa versa for the opposite tank. Fixing the tubes to the underside of the parcel shelf ensures that the tubes are higher than the top of both tanks and fuel can't leak from the over full tank on the lower side of the car. It's only a problem when both tanks are full. RonR |
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| Author: | Firefirey [ Wed May 17, 2017 7:59 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Hi Jenk Nice car  and it was great to look at it's progress along the way.You do need to keep the Breather hoses up along the parcel shelf. I have just replaced mine on the Cooper S. You could hold them in place using some sound proofing which is factory for the Cooper S and Clubman GT. There are some threads on here,if you use the search up by the control panel at the top of the page. |
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| Author: | Jenk [ Wed May 17, 2017 8:15 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
gtogreen1969 wrote: Jenk wrote: gtogreen1969 wrote: Having them cross over helps as the hose has to rise an inch or so to be held by the tabs under the parcel shelf. Aren't the tabs only fitted to an S? my deluxe doesn't have them... but that's cool that's still very helpful... thanks gtogreen1969 The extra tabs were only fitted to cars with twin tanks. If you are fitting twins to another car then just use something else to hold the crossover tubes under the parcel shelf. Ok got it thanks again |
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| Author: | Jenk [ Wed May 17, 2017 8:17 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
rodmac wrote: Are the breathers passing out through the battery box or behind the battery box? If it's through the battery box then I'd move it by either running the RH tank breather tube across the boot and out the standard hole next to the LH tank with the LH tank breather or making another hole and crossing them. Cheers Rod yes both pass through the hole in the floor of battery box so looks like they need to pass out opposite sides so that what Ill be doing... thanks |
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| Author: | Jenk [ Wed May 17, 2017 8:19 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
miniron wrote: The tank vent tubes must exit to the opposite side of the boot and they must be fixed to the underside of the parcel shelf. Why? If you park on the LH side of the road with a steep camber the fuel in the RH tank flows across to the LH tank via the tank interconnecting pipe. If the LH tank pipe exits on the LHS fuel will overflow from the LH tank vent tube if both tanks are full. Visa versa for the opposite tank. Fixing the tubes to the underside of the parcel shelf ensures that the tubes are higher than the top of both tanks and fuel can't leak from the over full tank on the lower side of the car. It's only a problem when both tanks are full. RonR Thanks for the detailed explanation makes sense now... Ill get it sorted tomorrow just need to pick up some more tubing |
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| Author: | Jenk [ Wed May 17, 2017 8:21 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Firefirey wrote: Hi Jenk Nice car and it was great to look at it's progress along the way.You do need to keep the Breather hoses up along the parcel shelf. I have just replaced mine on the Cooper S. You could hold them in place using some sound proofing which is factory for the Cooper S and Clubman GT. There are some threads on here,if you use the search up by the control panel at the top of the page. Hi and thanks for the compliment, yes that seems to be the general consensus so tomorrow ill be buying new tubing and re route the tubes in the correct fashion. cheers |
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| Author: | drmini in aust [ Wed May 17, 2017 10:51 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Everybody above is correct. However... Mine has had twin tanks for 25 years, I just poked the RH tank breather hose through the floor near the battery cable. No hose crossover. I have not had a problem, even on track days. But it never gets parked on steep side slopes. 
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| Author: | Domsmith [ Sun May 28, 2017 6:34 pm ] |
| Post subject: | Re: Fuel Tank Breather Hoses |
Hi guys quick question. I have been looking at a Mk2 cooper s. Looks ok, but some small issues and looking for any advice about that. First, there seem to be only 2 tabs for the fuel breather hoses (where the blue arrows are in the photos). Maybe there is a third one up on the parcel shelf, but i did not see it. Should there always be a third one? and should the 2 outside ones be in the position where the blue arrows are? in photos of other cars they seemed to be in the position where the red arrows are. Also there are only 2 supports for the boot board. There are 2 holes where the third support should be - indicating that it would be riveted, is that right? Any advice would be most gratefully received - these days making an incorrect purchase decision can cost a lot 
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