Dom, if you want to do this you are going to need to run two filters,
one before the pump and one after.  You need the one before the pump
because the inlet size on the pump is 12mm, while the outlet size for
your older style tank is 7mm.  The cube filter has these two different
sizes one on each end so it is not only a filter but also a size
adapter.  You would either need to make an adapter that allows you to
step up from 7mm hose to 12mm or just have the older cube style filter
before the pump.  The outlet on the fuel pump is 7mm so the newer style
filter will work after the pump no problem.  Before the pump you can
have low pressure line, but after the pump you will need high pressure
line.

Let me know if you need any more info.

Ken Wilford
John 3:16
www.vanagain.com

On 3/10/2011 4:00 PM, Dominic Provini Jr. wrote:
> Good afternoon,
>
> I am planning on removing the square pre filter before the fuel pump on
> my 85 Westy, and installing the round canister after the fuel pump.
> When I remove this square filter, I will have to add new fuel line from
> the tank to the fuel pump.   My question is, I am almost positive the
> fuel line coming off the tank is 7mm.  Does this line have to be high
> pressure fuel line or low pressure fuel line?  Also what size is the
> fuel line from the fuel pump to the engine.  I don't have my book with
> me, so I thought I would ask.
>
> Thanks for your time
>
> Dom
>
> 85 Westy
>