1st time poster. Just finished dropping the tank for a cleanup and hose freshen and noticed the extra pair of wires with the fuel level sending unit on my early 71. Back in the day I had a 73 Z and it did have vapor lock problems. The dealer installed an electric pump that you could hear start as soon as the ignition was turned on. I'd always let it pressurize a little before starting and it seemed to make it a little easier to start when cold. I'm thinking of just getting the electric pump, hooking it up as the Datsun dealer did so it runs when the ignition is on. Is there really any big problem with this approach? My 73 ran this way from 74 up until the car disintegrated from rust in the early 90's.