shadesh

Thank You for your feedback. When should the other pins light up.?... upon cranking the engine?

ok.. so I got a test light, electrical connection cleaner and I pulled the plug out of the AFM unit, cleaned it and turned the ignition on. I used a simple test light to touch each of the pins to see which pins "light up". I looked at the wiring diagram and only the pins labeled "W39" and "W9" are the ones that light up. The rest of the pins don't. Should the rest of the pins light up if I crank the engine?? or should all the pins be lit up?

Thanks everyone.. I will try to tackle it now.

I looked at the AFM and there are two sets of wires coming in. The first set plugs into the AFM at the bottom and the second is a single black wire. That wire was not hooked to anything.!! Is that for ground? Maybe that is why the switch did not send signal to fuel pump?? Where should that wire connect to?

Thank You. I will start with the AFM to see if there is a wire that is connected to the switch in the AFM. Is this switch for the "potentiometer".. ? I looked at the AFM this morning, before I read your helpful comments and don't remember seeing any wires going to the AFM..hmm. maybe its at the bottom?? ....so, basicly if the AFM was working properly including the switch, then the fuel pump would turn on ONLY when I cranked the engine. The fuel pump would not turn on if I turned the key to the "ON" position.. am I correct? Thanks.

Hi there, I am having trouble with my 1975 280Z. I just bought this car and am trying to understand this beauty. I saved it from going to the junker. (: Here are my observations followed by my questions.: 1). The original wire to the fuel pump does not have any power. The previous owner ran a wire directly from this rectagular white block in the engine compartment next to the coil, it seems, to the fuel pump. I don't what that block is called. It is rectangular, white, and has a wire from the coil going to it and other wires attached as well. When I turn the ignition to "On" the fuel pump comes on. 2). The fuel pump RELAY clicks when I turn the ignition on. 3). The engine turns but does not start. Sometimes there is backfire from the intake. Questions: A.) Should the fuel pump turn on when I turn the key to the "ON" position or should the fuel pump turn on when I turn the key to the "START" position? B.) Why doesn't the original wire to the fuel pump (by the fuel tank) get any power? C.) Does the fuel Relay have anything to do with the wire at the fuel pump not getting any power? D.) Does AFM have anything to do with the wire at the fuel pump not getting any power? E.) Where does the wire from the fuel pump lead to? Does it go to fuel relay, ECU, ???? Somebody please help.

Awesome! Thanks so much..

Hi, You mentioned that you downloaded the wiring diagram. I have a 1975 datsun 280z for which I need the wiring diagram.. Can you please tell me where you downloaded the wiring diagram from.? Please. I really appreciate it. Thank You.