hmm, well did you remove all the hoses and blow through?
the pump could still be clogged, maybe one of the connection/fittings could be clogged
by using a pin you may have blocked the nozzle more, if you soak the nozzles in grease remover and blow through you may be able to free whatever dirt is left

also to sii where the system is clogged you can remove the different sections of hoses to see where it is blocked
ie- remove the hose to nozzle and see if it squirts, then move down to the next fitting/connection remove hose and see if it sprays out of there

let us know how it goes, were always here to help