Heroez Posted June 13, 2012 Share Posted June 13, 2012 (edited) Hello again Z people. My 1980 280zx no longer does the 5 second fuel prime. I wanted to fix it correctly instead of a band aid fix. So no toggle switch! What I have done is test all 3 fuel pump relays according to the manual, and they are working as they should. I tested the voltage at the fuel pump connector under the hatch carpet. The results are at key on when the 5 second should happen, I get 4.2 volts for a half second. Repeating the test, the voltage varies from 2-7 volts, always for a fraction of a second. I admit that electrical is a weak area for me. I looked at the wiring diagram and don't see a timer unit or some other components that would be suspect. In later models like 82-83 the 5 second prime is controlled by the ECU. Since mine is a 1980, it works differently somehow. I'm stuck. If anyone can help or has an idea, please post a reply. I have no idea what to look at next. Its almost as if something is clipping the voltage. What do you think? Edited June 13, 2012 by Heroez Quote Link to comment Share on other sites More sharing options...
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