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Well if your lift pump is good, it could be air getting into your fuel lines somewhere, (bad pickup etc) or some screwy solenoid/sensor on injection pump? Or injection pump itself is shitting the bed. With an electronic motor there are so many possible causes for hard starting. If you...

So it cranks at its usual fast cranking speed but just won't start?

Does it only have trouble cold starting, or does it ever have trouble starting when it's been running and already warmed up? I don't know anything about CAT's but if your lift pump was bad for awhile it probably overworked your injection pump which is probably slowly shitting the bed from doing...