[QUOTE] I heard at about 500K they should looked at getting rebuilt. [Quote]

they are good for a million if looked after........

when you have the spare coin, take it to a Diesel Injection place.......(dont know whats over there to recommend)

get them to run it up on the dyno - and they will tell you whats needed and when..... if they are any good

if you were in Wait Awhile (WA) I would suggest United Fuel Injection.........

so someone like that would be your first point of call......