Matt the fuel depends on what model you have, there are dedicated paraffin and petrol/Coleman fuel types, these have the roarer burner fitted (no domed cap on the burner). If you have the roarer type then the paraffin burner has four tubes under the burner, two tubes and its the petrol version.
The 'silent' burner type with the domed cap is the multifuel and will take paraffin or panel wipe/Aspen 4T or petrol, but petrol stinks and the additives are not good for you and will clog up the burner much much quicker than with the other cleaner fuels. You can burn meths in them with the addition of a restrictor tube and new jet but they don't burn as hot and IMHO is not worth the trouble.
Look on ebay for primus stove and you often see leather pump buckets from a Turkish seller, he is a great bloke and the seals are second to none, I think he charges a fiver for five including delivery; other parts from base-camp. Great stoves, give me a shout if you need any other help.
Multifuel here
http://www.youtube.com/watch?v=oVXZrNWY6GE
Roarer type here
http://www.youtube.com/watch?v=ZplVoS6oR-s