Gregor,

What I did is not the answer to your problem since you wish to keep all
wires under the dash.  However, if you don't find the exact answer to your
question, here is an alternative that works perfectly.

I purchased a fog light switch from Bus Depot and use that as my switch.
The fog light switch fits on the dash in an empty slot and looks absolutely
stock.  When I put the switch in the off position, the fuel pump receives no
power and thus the van will crank, but will not start and will not flood the
engine.  My wife and I used this setup last summer when we took a 14,000
mile trip to B.C.  We parked in a lot of remote areas and went on lots of
all day hikes.  It really felt good knowing that if anyone broke into the
van that they would not be able to hot wire it and steal our van.
Fortunately, our van was never broken into, but we sure felt better knowing
we had a setup where the van would not start---unless the person was a real
vanagon pro and figured out my setup.

What I did to connect the fog light switch in my 1991 Westy follows:

I ran a wire from the back of the fuse box to the fog light switch for
power.  I then ran a wire from the switch under the van to the engine
compartment.  Over on the right hand side of the engine compartment
(behind the air filter enclosure) is a connector for the wires to the
fuel pump. (It may be in a different location on older vans).
 I installed a regular relay by that connector.  For lack of better
terminology, the connector has two parts --- A plugs into B.  From A,
I ran a new wire from the RW wire to #30 on the relay.  From #87 on
the relay, I ran a new wire to the RW wire on B.  I ran a new wire
from the ground wire in A to B.   I installed a ground wire from #86
on the relay to the chassis.  The wire I ran from the front of the van
to the engine compartment, I attached to #85 on the relay.

Now, when the fog light switch is in the off position, the fuel pump
is not getting power and the van will not start.  Works like a charm.

If I wish to go back to stock, I just pull the wires I added and plug
the original connectors together.

Hope this helps.

Harold
--
Harold & Faye Teer
1991 Westy

On 10/15/06, Gregor Brandt <gbrandt@marionette.ca> wrote:
>
> After my recent van break-in and my upcoming full body restoration, I want
> to protect my van from theft.
>
> I was thinking of adding a fuel pump cutoff switch hidden under the dash
> somewhere.  I've searched gerry, but it keeps timing out on me.
>
> Has anybody done this before that can point me in the right direction.  I
> should be able to get the correct wires from the fuse box and not have to
> run my switch right to the pump itself.
>
> Thanks
>
> Gregor
>