Won't stay running

[electricalman777]

Hello everyone. I have a 1975 280z and I can't keep it running. I will describe the problem. I changed the key part of ignition works fine then the fuel pump wasn't working. Got that working also have good fuel pressure. The only way I can get it to run is to pour gas into the intake by the airflow. It runs great until it uses that fuel that I pour in. Does this mean that my injectors are all cloggeg? Or does it mean my relay isnt working. I can feel it click when I turn the key and the fuel pump works so I figure its not the relay. I also know the gas is making it to the fuel rail because I can losen a hose clamp and gas leaks out right before the injectors. Is there something I am missing out on checking. Any help would be greatly appreciated. Thank you

[grantf]

perhaps you're injectors are not firing. check the connections with a meter??? I read somewhere here about using a christmas light bulb to test.

[electricalman777]

Wouldn't that mean that they would all be dead or that my ecu or relay wasn't working?

[FastWoman]

As grantf suggests, you can plug a miniature Christmas tree light bulb into your injector connector (i.e. after unplugging an injector). The light should flash once per rotation of the engine (twice per 4-stroke cycle).

The FSM says to test your ECU by unplugging the coolant temp sensor and seeing whether the light flashes brighter/longer. I would imagine an ECU could be half dead and still pass this test, but that's what the FSM says.

You say you did some ignition work. If you don't have connectivity between the (-) post of the ignition coil and the #1 pin of the ECU, the ECU will not detect rotation of the engine and will not fire the injectors. Check your connections.