cheet22

Member
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.
 

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