 He and his wife Melody have two children, Mia-Lili and Seth.After finishing second in both 1988 and 1989, Crump won his first major junior speedway title in 1990 becoming Australian Under-16 champion at the Bibra Lake Speedway in Perth, Western Australia (Crump defeated future Australian champion and team mate Ryan Sullivan for the title), and he progressed through the ranks.His best placing in the Australian Under-21 Championship was third in 1992 at the Riverview Speedway in Murray Bridge (South Australia) behind reigning Australian U/21 and senior champion Leigh Adams and second placed Jason Hawkes, making it an all-Mildura podium.