go search for the fuel filter guide a few people have posted.
most important thing here is DO NOT TRY TO START ENGINE.
you will have a big lot of air in the injection pump, trying to start it can stuff the pump.
take the outlet house off the fuel filter. pump the primer until fuel comes out. if it doesn't come out (it may take a while to pump it up especially if its drained back to tank) you will need to either fill manually with CLEAN fuel or fit a pump at the tank and pump it up.
if you fill it manually make sure you fill the fuel hoses to.
after filter is full of fuel, refit outlet hose and continue to pump. it should get hard but you will need to keep pumping. you have to fill the injection pump with fuel which can be quite hard to do. you may have to bump the engine over a bit and continue pumping the primer. by now your hand should be almost falling off !
try to get the pump as full as possible before trying to start it. when you do get it started continue pumping the primer a bit more, you need to get any air out of the system as fast as possible.