Fuel Lines Diameter

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cheet22

Member
Posts
54
Location
Hamilton, Scotland
Hi all,

Im still rebuilding my 1981 S3 109 with 200tdi (from Discovery).

Ive just fitted new rear fuel tank, so time for pipes. I have repair operation manual, parts catalogue and google, but still struggling to be sure what diameter pipes I need.

I saw one video on YT that said 5/16 and 3/8 are needed - are they outside diameter? The pipe connections on tank look like they need those to be internal diameter - I mean, they look bigger.

I know I need different fittings at either end for the series tank, but 200tdi engine. But just stuck on the pipes needed, which I was looking to buy off the roll so to speak.
 
200tdi 8mm inner from tank to lift pump and filter to inj pump.
6mm inner return to tank I do believe.
Well, it is on ours anyway.
 
As a rough rule flexible hoses are measured inside diameter, and rigid pipe is measured outside diameter.
 
Sorry folks, back again

I now have some 8mm and 6mm pipe.

I think I also need the 13mm pipe that runs as balancer (this is a diesel rear tank 109), then another 13mm piece for breather?

Then the 6mm and 8mm are feed to fuel pump, return from injector pump right?

But I see on some videos the use of compression fittings for both these at tank? Where can I get those?

Cheers again!
 
On our Ninety it's 8mm to lift pump, the lift pump came with a new pipe to the filter, then it's 8mm to the injection pump. It's 6mm going back to the tank.
Bear in mind it's a conversion but still fuel pipes should be the same.
With regards to the rear tank on yours I am no help.
 
Anaconda said:
On our Ninety it's 8mm to lift pump, the lift pump came with a new pipe to the filter, then it's 8mm to the injection pump. It's 6mm going back to the tank.
Bear in mind it's a conversion but still fuel pipes should be the same.
With regards to the rear tank on yours I am no help.
Click to expand...
cheers - yeah at the engine end (200tdi) this all sounds right. Just cant figure out how to connect feed and return to tank itself. Workshop does not show it as I can see, but some vids seem to show compression type fittings.

Both the feed and return flanges measure same 8.12mm OD. But presumably I need some compression type fittings here to connect the 8mm to feed and 6mm to return. Pic attached.
 

Attachments

  • pipes.pdf
    1.3 MB · Views: 18
Ahh, think I am over thinking this. I think its just standard fuel couplers I need on each of the feed/return pipes, that compress fit to those pipes on tank. Will mess with getting a few from plumbers see if they fit. Just cannot see a LR part for them for the diesel 109.
 
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