[crldv911]

no power at fuel pump wires. was runnning fine. pulled out the headlight to fix a looseness it had. then the car would not start.. dont know if they are related. the wire on the headlight was frayed a big. dont know if it touched the chassis. Light works fine though. the relay under the hood clicks. so i think its working. i think there is another relay under the dash. saw something on it here b4. can someone tell me exactly where and if they think that it might be it. thanks alot . THis is my second 280zx best cars ever. have learned alot here. thanks people!!

 

[Tom D.]

There is a fuel pump relay under the dash on the driver's side. The relay logic is a bit complicated, but you can pull the unit out and bench test it (fairly simple) to see if it is working properly (you will need a wiring diagram/test procedure). If it is working properly on the bench, you can then focus on why the relay isn't getting the proper voltage from external sources. Again, a wiring diagram is essential.

By the way, the fuel pump isn't supposed to have power all the time. Are you sure you are testing it under the right conditions?

Tom D.

 

[79-280-ZX]

On the 81 N/A there are three relays for the fuel pump. #1 is under the dash on the passengers side. #2 and #3 are in the relay box near the right headlamp. They are the two closest to the fender. I have also seen these two relays contained in the same holder if so it will be twice as long as the other relays in the box but it is still be closest to the fender.

The electrical connection to the pump can be found under the floor mat in the back. Green is power and Black is ground. Disconnect the small gauge wire from the starter solenoid and hook a meter to the two wires going to the pump. You should see battery voltage when the key is turned to "start" and the pump should run. Hook the wire back to the solenoid. When the engine is running you should always see battery voltage and the pump should always be running.

Wayne Monteath
Masham, Quebec.