datsundoug Posted April 3, 2009 Share Posted April 3, 2009 I recently got a 77 280z. It is stock and has been sitting for a long time. I drained the old fuel, changed some fuel lines, and put some fresh gas in with injector cleaner. When I turn the key to the on position, the fuel pump runs constantly. It never shuts off. I know that I'm getting pressure, and gas is getting to the injectors, but the pump never shuts off. Is there a shut off switch/valve that should turn the pump off when its pressurized, or is this normal. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted April 9, 2009 Share Posted April 9, 2009 The switch is in the airflow meter. There are a few things that can cause this. 1. someone wired it to work around a non-functional microswitch. 2. there is a mouse nest in the airflow meter holding the flap open. 3. the flap is sticking partially open 4. someone opened the plastic cover and bent the microswitch terminals together. If you unplug the airflow meter and the pump still runs........it is number 1. Quote Link to comment Share on other sites More sharing options...
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