freelander wont go

:doh:hi my 51 plate td4 sometimes starts but wont run 4 long , things started to go wrong during the last cold spell all had been fine untill it hadnt been started 4 about 3 days so on starting it the yellow engine lit up on the dash and clouds of white smoke from the exhaust . so i cleaned the e g r and changed the fuel filter that didnt work for long , now ive had both fuel pumps checked :tank/inner wing: all seems ok so now ive established theres fuel to the injector pump but none at the injectors am i about to spend a lot of money on a new injector pump or has anyone got any other ideas ? any help is appretiated