I'm installing a supply and return line for an auxillary fuel tank (wvo).

I have .17" line (4.3 mm) ID line for the return.

In searching other posts (of course, after purchasing the fuel line I have) I found normal return is 6 mm.

Does anyone know whether the MB dimensions are ID or OD? Can you imagine problems using the 4.3 mm ID for the return?

Thanks!

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1983 300td 240k (down with bad tranny)
1984 300d 222k (daily driver) "Olive"
1997 GMC K2500 105k (sled dog limo)

"The scenery in ANWR is as spectacular as the Grand Canyon and the wildlife is more impressive."