2001 f350, engine cranks but won't start, no fuel, I can hear a clicking sound from behind the dash like a relay isn' t locked in. Sometimes it will start sometimes not. Finally other day wouldn't start at all. Found the 30amp fues for the pcm, injector driver, fuel heater was blown. Put new fuse in and would be alright with key on but blow when cranked. Unhooked the fuel heater and relays for the pcm/ injector driver one at time until the fuse wouldn't blow. Left the fuel heater unplugged and fuse dosn't blow but truck still sometimes won't start and can still hear a relay clicking. Any ideas? Any help would be great. Have a DP tunner but have tried with it hooked up and unhooked no difference.