I know this isn't the forum for this question but someone electic fuel pumps should know. The car is a 76 Datsun 280z with Ljetronic system. The car has been setting up for 4 mos and I just charged the battery, cleaned the plugs, and checked for spark. When the motor turns over the potentiometer moves to start the pump but I can't hear it run. I confirmed no fuel pressure by replacing the fuel filter line and no resultant spew of fuel. It was due for this before I stopped driving the car. The potentiometer tests for signal to the fuel pump or computer - I forget. I tried banging on the pump with a hammer to no avail. Any help would be great - even gorrila tactics. This car hasn't not started for this reason ever. I didn't say never. Thank You.

/// Yo Chip: Don't have a clue. Check fuses/connectors for corrosion--sat for months.

Potentiometer, voltmeter? That just means voltage is there. Where you measure will make a difference. Can you detect voltage on both sides of the motor winding, burned winding, open motor winding. Are you detecting the voltage to a relay not the motor.

If it had water in the gas, the pump might be rusted frozen or if left unheated may actually have been frozen in the last four months. Depends on where you are.

Sorry not a clue.