ausmini :: View topic - Rover fuel tank and EFI queries

1. Recently picked up a late Rover MPI fuel tank. It has three pipes: Fuel out, fuel return and one that is at the top of the tank that is connected to a small plastic cannister (one-way-valve?) which then either returned to front of car or to the ground. Is this a fuel overflow pipe and if so did it go to the ground, or where?

jb007 wrote:

it's a breather - you need it to let air in / out when fuel goes out / in

All the front to rear wiring was run inside the car on the passengers floor. Pretty sure the fuel lines for these were 8mm (or 5/16" in old money).

GT mowog wrote:

All the front to rear wiring was run inside the car on the passengers floor. Pretty sure the fuel lines for these were 8mm (or 5/16" in old money).

Thanks. Silly question, is that ID or OD? :oops:

I'm not sure but you could just block it if you have a vented fuel cap.

The tube is 5/16 bundy tube which is measured outside, to fit 5/16 / 8mm EFI hose.

The hose on the top isn't intended to vent straight to ground, it actually goes back to the front of the car and into the charcoal canister which then goes to the inlet manifold to dispose of the fumes.

I'm not sure but you could just block it if you have a vented fuel cap.

Monza and Aston caps are just shiny covers, whether it breathes or not depends on the cap inside.

The don't think the old carby cars vented to the ground, they would've gone to the charcoal canister and then the inlet too.

Charcoal cannisters came in with ADR 27A , which was mid 1976, so most Oz built Minis didn't have them. As your mini is a 1968, no need to comply with ADR 27a, so just vent it out the boot floor.

Andrew

afh001 wrote:

To all the greenies out there, please forgive me for what I'm about to do. :shock:

Thanks all for your input.

Author:	jb007 [ Fri Jul 16, 2010 5:51 pm ]
Post subject:	Rover fuel tank and EFI queries
Couple of Q's: 1. Recently picked up a late Rover MPI fuel tank. It has three pipes: Fuel out, fuel return and one that is at the top of the tank that is connected to a small plastic cannister (one-way-valve?) which then either returned to front of car or to the ground. Is this a fuel overflow pipe and if so did it go to the ground, or where? 2. On the original Rovers, how did they run the power cable(s) for the fuel injection pump (mounted in fuel tank), under the car, or in the car? 3. On the Rovers, what was the diameter of the supply and return pipes? TIA Jim

Author:	simon k [ Fri Jul 16, 2010 5:57 pm ]
Post subject:	Re: Rover fuel tank and EFI queries
jb007 wrote: 1. Recently picked up a late Rover MPI fuel tank. It has three pipes: Fuel out, fuel return and one that is at the top of the tank that is connected to a small plastic cannister (one-way-valve?) which then either returned to front of car or to the ground. Is this a fuel overflow pipe and if so did it go to the ground, or where? it's a breather - you need it to let air in / out when fuel goes out / in

Author:	jb007 [ Fri Jul 16, 2010 6:03 pm ]
Post subject:	Re: Rover fuel tank and EFI queries
simon k wrote: jb007 wrote: 1. Recently picked up a late Rover MPI fuel tank. It has three pipes: Fuel out, fuel return and one that is at the top of the tank that is connected to a small plastic cannister (one-way-valve?) which then either returned to front of car or to the ground. Is this a fuel overflow pipe and if so did it go to the ground, or where? it's a breather - you need it to let air in / out when fuel goes out / in Thanks for that, so I'll just vent it to ground through the boot.

Author:	GT mowog [ Fri Jul 16, 2010 6:03 pm ]
Post subject:
All the front to rear wiring was run inside the car on the passengers floor. Pretty sure the fuel lines for these were 8mm (or 5/16" in old money).

Author:	jb007 [ Fri Jul 16, 2010 6:10 pm ]
Post subject:
GT mowog wrote: All the front to rear wiring was run inside the car on the passengers floor. Pretty sure the fuel lines for these were 8mm (or 5/16" in old money). Thanks. Silly question, is that ID or OD?

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Author:	GT mowog [ Fri Jul 16, 2010 6:17 pm ]
Post subject:
jb007 wrote: GT mowog wrote: All the front to rear wiring was run inside the car on the passengers floor. Pretty sure the fuel lines for these were 8mm (or 5/16" in old money). Thanks. Silly question, is that ID or OD? ID (PS - the only silly question is the one you don't ask!) Cheers

Author:	Harley [ Fri Jul 16, 2010 6:24 pm ]
Post subject:
The tube is 5/16 bundy tube which is measured outside, to fit 5/16 / 8mm EFI hose. The hose on the top isn't intended to vent straight to ground, it actually goes back to the front of the car and into the charcoal canister which then goes to the inlet manifold to dispose of the fumes. I'm not sure but you could just block it if you have a vented fuel cap.

Author:	GT mowog [ Fri Jul 16, 2010 6:28 pm ]
Post subject:
Harley wrote: I'm not sure but you could just block it if you have a vented fuel cap. Yes, you could block it with a vented cap, but they leak on hard pedal-to-the-metal. I'd suggest a sealed cap and venting that outlet under the boot like the older carbie models.

Author:	jb007 [ Fri Jul 16, 2010 6:33 pm ]
Post subject:
Harley wrote: The tube is 5/16 bundy tube which is measured outside, to fit 5/16 / 8mm EFI hose. The hose on the top isn't intended to vent straight to ground, it actually goes back to the front of the car and into the charcoal canister which then goes to the inlet manifold to dispose of the fumes. I'm not sure but you could just block it if you have a vented fuel cap. Makes sense now, the canister thing on top fuel tank is most probably a one way valve that opens when there is positive pressure in tank. Since I don't have charcoal canister, I will block it and use a vented cap. I guess my Monza cap is vented?

Author:	Harley [ Fri Jul 16, 2010 6:56 pm ]
Post subject:
Monza and Aston caps are just shiny covers, whether it breathes or not depends on the cap inside. The don't think the old carby cars vented to the ground, they would've gone to the charcoal canister and then the inlet too.

Author:	jb007 [ Fri Jul 16, 2010 7:02 pm ]
Post subject:
Harley wrote: Monza and Aston caps are just shiny covers, whether it breathes or not depends on the cap inside. The don't think the old carby cars vented to the ground, they would've gone to the charcoal canister and then the inlet too. I'll check my cap in the light tomorrow. I have never seen a charcoal cannister under a Aussie round nose, only on Clubmans. Can anyone else shed light on this?

Author:	drmini in aust [ Fri Jul 16, 2010 7:18 pm ]
Post subject:
No charcoal canisters were used on roundies in Oz (which ended in 1971). They came in later. Roundies all vented to ground through a hole in the boot, caps were sealed.

Author:	afh001 [ Fri Jul 16, 2010 7:20 pm ]
Post subject:
Charcoal cannisters came in with ADR 27A , which was mid 1976, so most Oz built Minis didn't have them. As your mini is a 1968, no need to comply with ADR 27a, so just vent it out the boot floor. Andrew

Author:	jb007 [ Fri Jul 16, 2010 7:27 pm ]
Post subject:
afh001 wrote: Charcoal cannisters came in with ADR 27A , which was mid 1976, so most Oz built Minis didn't have them. As your mini is a 1968, no need to comply with ADR 27a, so just vent it out the boot floor. Andrew To all the greenies out there, please forgive me for what I'm about to do. Thanks all for your input.

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Author:	VicMini13 [ Mon Jul 19, 2010 8:23 am ]
Post subject:
jb007 wrote: afh001 wrote: Charcoal cannisters came in with ADR 27A , which was mid 1976, so most Oz built Minis didn't have them. As your mini is a 1968, no need to comply with ADR 27a, so just vent it out the boot floor. Andrew To all the greenies out there, please forgive me for what I'm about to do. Thanks all for your input. The vents on the non-charcoal canister models was run across the underside of the rear parcel shelf and vented out the bottom of the boot floor on the opposite side of the car. If you just take it straight down and out on the same side as the tank you will spill a lot more fuel out the overflow when performing spirited cornering.