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

_________________
Jenk.

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??

_________________
Jenk.

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

_________________
Jenk.

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.

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

_________________
1967 New British Racing Green Mk1 Cooper S, 1967 Lake Green 1275 MG Midget, 1969 Jet Red / Crystal White Mk2 Cooper S, 1972 Gambier Turquoise Clubman GT (ex police), 1972 Camino Gold Clubman GT, 2009 JCW Challenge Edition, Megane RS265, Clio RS220.

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

_________________
68 build Mk1 Cooper S
72 Clubman GT project. Total restoration required

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.

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

_________________
Jenk.

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

_________________
Jenk.

Thanks for the detailed explanation makes sense now... Ill get it sorted tomorrow just need to pick up some more tubing

_________________
Jenk.

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

_________________
Jenk.

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.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

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

_________________
1970 Morris Cooper 'S'