Can anyone help me with a photo showing the correct route for the left to right fuel line and the run of the two vent lines please.

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John Sneddon
0408 431 807
1963 Morris Cooper
1965 Morris 850
1968 Morris Cooper S

Hi John, I can photo mine if you like, but the layout of the vent pipes is different for 1965, then 1966 & 1967 thereafter. I think the fuel lines were all the same though?
Mine is a 1966 with the vent pipe clips instead of tags at the RH tank, & there are a few 1965 cars over here in Adelaide with (correctly) no clips or tags at the RH tank.

My car is about 500 after yours so it should be similar.

What material are your vent pipes made from?


Sent from my iPad using Tapatalk

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Its a hard black plastic. I have never pulled them off to check the wall thickness or ID.

The tank vent pipes must cross over to the other side irrespective of how the are held in position.
If they don't and you park in a street with a large camber and full tanks, fuel from the RH tank will move across to the LH tank via the interconnecting fuel pipe, which will then cause the LH tank to overflow via the vent pipe onto the ground under the LHS of the car.
There are 2 reasons to avoid this:
A: You waste fuel
B: The muffler and fuel pump are on that side and the potential for a fire under your prized S is high.

RonR

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

Have recently fitted out the boot on my project and found vent pipe tube at (defunct) Masters. It is black nylon 1/4 inch OD and a tight 5/32 ID. Fitted perfectly on tank outlets and cost about $1.50/meter. Looks identical to original. Should have bought the roll and cornered the market!

Thank you - all sorted now.

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John Sneddon
0408 431 807
1963 Morris Cooper
1965 Morris 850
1968 Morris Cooper S

To get this right in my head. The right hand vent pipe crosses over to the left and pokes through the boot floor and visa/versa for the left pipe.

That's correct. When parked on an incline the fuel level in the two tanks equalises because they are connected by a pipe at the bottom. In an extreme case with full tanks the fuel level in the tank on the lower side may rise to the point where it exits through the breather tube. Keeping the breather tubes high under the parcel shelf and crossing over means fuel is less likely to spill through them onto the road.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

So, you couldn't have vented fuel caps then as the fuel in the right hand tank could drain across and overfill the left tank and spill out through the vented cap if it had one ?

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Find a job you love and you will never have to go to work !

Yep..what, Ron said

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"Show me the Mini!"