03 buick rendezvous. Thought it was fuel pump but it was a fuse. But car still won't start backfired. Husband said timing chain. had extensive engine work and transmission work already.Can a car give

could be still a fuel pump going bad. working hard to pump fuel drawing more electric load through the fuse which would blow the fuse, test fuel pressure at injectors, could be bad gas, timing change may have jumped a tooth and needs adjust/replaced. valves may not be sealing properly

Every tune up the timing chain has to be tighten (adjusted).