The aftermarket repalcement tank uses the same outlet as used from
1980-1985. The prepump fuel filter used on thse years makes the perfect
adapter. Make sure the vapor recovery system (venting) is working properly
and that the charcoal canister is not about to dump the carbon and block the
inlet tube. The replacement tank will not put up any fight at all for the
pump suction to collapse it. BTDT!

Dennis

>From: Dan Barrett <dbx@POBOX.COM>
>Reply-To: Dan Barrett <dbx@POBOX.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: fuel tank <-> pump diameter mismatch
>Date: Thu, 13 Dec 2007 00:13:38 -0500
>
>Volks,
>   Just had a new fuel tank put in my 1990 GL because the old one was well
>rusted.  I could've sworn that on my old tank, the diameter of the tank
>outlet and the diameter of the fuel pump inlet were equal -- it was a
>stretch of larger-diameter hose connecting the two.
>
>   The new tank's outlet looks to be narrower than the old one's: the same
>diameter as the line coming out of the fuel pump, i.e. the 7mm (?) line
>that runs to the engine compartment.  But that leaves me with hooking up
>the large-diameter fuel pump inlet to the small-diameter fuel tank
>outlet.  The shop I took it to (a bunch of VW old-timers who work almost
>entirely on air-cooleds) fashioned some kind of adapter out of what
>looks like copper tubing and solder to mate the wide fuel pump line to a
>narrower bit of hose connected to the fuel tank outlet.
>
>   I'd be laughing about it if it weren't leaking ever so slightly when the
>engine is off.
>
>   So, now it's snowing out, my fuel system is slowly leaking onto the
>street, and I'm wondering what to do.  I've never had anything between
>the fuel pump and the tank (like that weird box filter on Bentley
>20.26), so what on earth is going on here?  What if I just put a length
>of 7mm hose over the fuel tank outlet pipe to build up its diameter, and
>then clamp the wider-diameter fuel pump line over that?  Any guidance
>appreciated.
>
>Best,
>d.
>1990 GL -- "Mudskipper"