Fuel Lines Diameter

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cheet22

Member
Posts
51
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.
 
As a rough rule flexible hoses are measured inside diameter, and rigid pipe is measured outside diameter.
 
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