It is 5/16 inch or 7.9 mm.  I have recently learned that there is a
difference between standard fuel line and that for fuel injection.  The
latter is high pressure (electronic fuel pumps for FI put out 80 plus psi).
I just bought some today for the price of $4.49 A FOOT!

I did use regular fuel line when I replaced the fuel filter recently and
haven't had any problem yet, but it was a pretty short piece of hose.  I
will go back and replace it with the correct hose in the near future just to
be on the safe side.

Walter Evens
Hesperia, CA, USA
2-85GLs

----- Original Message -----
From: "Smola, Tony" <TSmola@TRIBUNE.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, February 26, 2002 4:16 PM
Subject: Fuel Injection Hose-----what size ID.....7mm?

> I'm going to replace the hoses in the engine compartment that lead from
the
> plastic piece in the firewall to the metal T and to the injectors......Is
> this 7MM ID?
>
> TIIA
>
> Malibu Tony  85' Westy 1.9L  5 degrees BTDC
>                    78' 911SC Targa
>