Your picture looks like it is a carburetor van, as opposed to fuel
injection.  I have never replaced the fuel pump on a carburetor van, but
    I did replace one with an electric fuel pump on a 73 bus.  Very easy
to install and total cost would be about $30-$40 here in the US.  It was
mounted on the underside of the bus, in a protected area.  Just run a
fuel hose from the tank, to the pump, to your carburetor, and put a
filter in there somewhere.  It is wise to also include a fuel pressure
regulator, mine was mounted right onto the fuel pump.  I believe the
regulator was set to around 1.5 pounds, cant remember  exactly.  I ran
the power wire fromn the pump to the positive terminal on the coil.
Only thing is that it can be unsafe if an accident occurs- the pump wont
automatically shut off.  It worked great for over 10 years and was still
on the bus when I sold it.

david

Truls Erik Johnsen wrote:
> I got this advice from a guy called Jim at the Passion forum at
> www.mtbr.com (he might also be around here)regarding this image:
> http://superelectric.net/transporter/0004.html This is his advice:
>
> "Looks like the mech fuel pump is leaking at the base. I'd go ahead and
> replace the pump (super cheap) along with the seal, if it was mine.
> Check and see if it's a oily/gas mixture, if so, the diaphragm is
> leaking. I've ruined a perfectly good 1600cc in a beetle with a leaky
> diaphragm."
>
> I guess changing the pump is a fairly easy (is it really needed,
> should'nt it be enough to change the gasket?), but I have no idea on how
> to change the diaphragm. Any online descriptions on the procedure? And
> how expensive is a new fuel-pump?
>
> Regards
>
> Truls Erik Johnsen
> Oslo, Norway