swap lbz to lb7
I put an lbz motor in my lb7 using all lb7 electronics lbz engine harness to hook up injectors witch i hooked to my lb7 harness ,tuned with my hp tuner !!
ficm
you probly don't have enough rail pressure at cranking , possible causes sensor, cp3 , etc , mine was pluged return line, cp3 will not pump if this happens : george