Fuell line size and ID 73.5 vs. 79 CIS

[Porsche Head]

I am tryig to see if the CIS and/or fuel+acumulator I have on my 79 is actually from a 73.5 or 79? I had a PO do the install many years ago and now that I am replacing my pump (Walbro 392) I am checking the lines and seeing if they are up to speed for current and future (Rotrex supercharger) performance.

I measured the pressure line and it is a 8mm line (banjo to rubber to clamped line).

[Porsche Head]

Bump

Why are the fuel filters different 73.5 vs. 78-79 vs. 80 on, is this because of the line sizes? Can someone please measure (calipers) the line in to the filter, it's pretty easy to access, thanks.

I asked PP but they said they don't have the size of the line from the pump to filter so I don't know which to order. The filter I have seems to indicate it's a 73.5 but the engine is a 3.0.

Thanks.

[James Brown]

My 81 hard lines are 12mm OD both supply and return