The P7100 doesn't happen to have a fuel cutoff solenoid like the VE pump does it?
I totally forgot about hooking that up on my engine and it wouldn't fire up.
I forgot about the fuel shut also and had one go bad on one of my boats 5.9's, It was sticky and did not open sometimes and was a pain to to diagnose too! You can run power to it and watch how the piston moves or maybe listen to it.
Doug