HFS-3 shuts down after blue trunk wire is attached

[CactusS4]

Symtoms,

turn on ignition without blue/trunk wire, gauge fires up, have the S in the gauge etc. Plug the blue (trunk) wire in and about 15-20 seconds unit clicks and gauge goes to simple yellow tank light.

So trying to run the flow test, I turn on ignition, remove the blue wire , move the required pins in the controller, replug the blue and I get Jet spray, FAV etc works and I have plenty of fluid in my tank (over 2 gallons). I didn't do any splicing of the blue trunk wire, could this be a bad sensor or else?

How can I figure this out.

Video here to help visualize the issue.

http://www.youtube.com/watch?v=WfPYX12qsMA

Thanks,
Tory