http://www.fuelsystem.co.uk/web-facet.pdfits the top £31 one... but theyre normally "25 on ebay (new)
you dont strictly need one, but the extra pump makes a big difference... install it in the fuel line just after the tank to help lift/push the oil up to the filter - makes starting and running a bit easier :-)
even better if you can get fresh oil...
(not the used stuff which most people use)
where are you going ? (just noticed the bit about the snow) if its going to be really cold... you could really add a small heat exchanger too... Ive got a spair one you can have if you like... its just going to sit on a shelf forever so might as well be used!#
older indirect injection engines are the best for running on oil.... Ive got a van with one and it runs on oil all the time, hasnt seen a drop of diesel in months... got a couple of vans with common rail engines which are a bit trickier, needs a twin tank setup so you start up on diesel then switch over to veg oil once its up and running :-)
also.... its totally legal to run on veg oil!..... as long as you use less than 2500litres a year, you dont have to pay any tax on it, register or do any paperwork etc...
(Ive been dipped twice and it;s never been a problem)
check out this place for more info...
http://www.vegetableoildiesel.co.uk/forum/index.phpbit of a heads up tho.... theyre right tight bastards on there... ignore all the posts about air leaks etc.. (pump will sort that out) a lot of them run 20yr old cars... and (obviously) have problems with them... but refuse to spend any money on them.... so it sounds worse than it is... (i.e. months of problems for the sake of two quids worth of fuel hose etc...)
if you do it properly... add a pump (£25 and 30mins work) maybe change the heaterplugs if it needs them (£12 and 20min) then you wont have any problems at all !