Re: Can you hear the fuel pump ? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Can you hear the fuel pump ?
Posted by Dean (more from Dean) on Sun, 6 Sep 2015 08:28:12
In Reply to: Can you hear the fuel pump ?, K W, Sat, 5 Sep 2015 18:48:05
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Lift rear seat and you can hear the fuel pump a lot better.
When ignition turned on, the brief pump run is priming only.
Also, when cranking, the tach should show that.
When cranking, if CPS signal is not received by the ECU, the ECU does not know that you are trying to start the car, then the fuel pump is not powered up and no ignition action.
If pump not heard running, you can probe for power at the fuel pump fuse. And you can apply power there to the pump and if then not running, bang on the pump access area to see if that gets any action. In any case, if pump has power and does not run, verify ground connection then replace pump.
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