Hello I have a 1982 280zx NA that was running and driving. When I went to turn it on the pump primed normally, except towards the end it sounded like it was loosing a bit of power. It turned on and ran fine. Second time i tried to turn it on, i got no priming of the fuel pump. I hear the relay switch on and off as if it were priming.
Things I have done.
-Pulled the fuel pump ( direct connect to battery worked)( so i dont think its the pump itself)
- Checked fuseable links all are good
-Checked power to the fuel pump wires, one grounded wire and one power* ( gave a range off 11 to 12v when connected to only voltmeter)(no voltage to little .05v when connected to pump)
- Tried switching the poles around too, but nothing.
The odd thing is that when I connect the fuel pump both poles become grounded, is this a normal thing? (I dont have someone to prime the pump while I probe with the meter to see if this changes)

Since I am getting voltage when connected to the voltmeter and the pump worked normaly when connected straight to battery. I'm somewhat at a loss on what could be wrong.
If you have any idea of what may be wrong or other trouble shooting things i can do please let me know.

 

Replace the fuel pump relay.

 

I'm an idiot sandwich. Thank you. figured since it was clicking it was good. But alas you were correct switched it out and it fired right up.

 

Even an old blind dog like myself finds a bone once in a while. Glad it back on the road