Pumps Pumping, but wont run

[vedivan]

1976 280Z

I removed my tank and had it cleaned. Before reinstalling it, I ran a line into a clean can of gas, and to the fuel pump. The pump is pumping, And the car fires on ether, but will not stay running. How can I test to see if the fuel is getting to the fuel injectors?

Thanks

Edited March 19, 2013 by vedivan

[FastWoman]

Try this: Put a fuel pressure gauge on your fuel line. Remove the electrical connector from your cold start valve. Run the pump to pressurize the line, and then shut off the pump. Observe how fast the fuel pressure drops off.

Then pull off the coolant temp sensor connector, and repeat the above with your foot on the accelerator pedal while you crank the engine. If your injectors are delivering fuel, you should see the fuel pressure bleed off faster than it did the first time.

You can test your injectors individually by grounding them at the ECU connector. (You'll need to download the Factory Service Manual to find out how.) Same test: Pressurize your system, shut down the pump, and then ground an injector to see if the fuel pressure drops. Note: Resist the temptation to apply 12V directly to the injector. You need a drop resistor, or you can burn out the injector.

To see if your injectors are getting electrical power, plug a Christmas tree light bulb into an injector connector. You should see it flash once per engine rotation. It will flash brighter/longer if you also disconnect the coolant temp sensor.