I have a 1989 1.7 Diesel Transporter panel van and have just noticed 2 white
(blow moulded) plastic tanks each mounted inside the rear top of each of the
front wheel arches. They are scalloped to allow the fuel filler pipe to pass
by on one side. Each tank has 2 flexible hoses (about quarter inch dia) on
the lower side which disappear towards the centre of the van, above the
front end of the fuel tank. A third pipe (again about quarter inch) and may
not be related emerges down the side of the tank from somewhere above the
tank. The tanks each seem to have a 2 inch by 1 inch 'port' which interfaces
to the back of the wheelarch. On the other side (inside the load space of
the van) there is a depression in the metalwork of the bulkhead
corresponding to the shape of this port as if something could be cut out.

Can anyone tell me what the function of these tanks is? To where are they
connected and what fluids (if any!) should be in them.

This van is not converted and has no heating system other than in the cab as
far as I am aware.

thanks

R Andrews