Re: 89T fuel pumps run after the ignition is turned off - Saab 900 Bulletin Board - Saabnet.com
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So I would guess the best way is to chase the circuit back until you find what shuts off the power. If I remember correctly you can disconnect the fuel pump and plug one of the turn signal lights from the fender into the connector and if the light is lit you have power. I believe the circuit goes in the following sequence. But I don't have the wiring diagram infront of me. The main relay powers the ecm, the ecm provides ground to fuel pump relay if it senses ignition pulses. The fuel pump relay sends power out to the pressure transducer that interrupts power if over boost is detected. Power then goes to the fuse then back to the pump. Good Luck, Bernie
George Riggin Specialty Automotive
1993 900 Turbo Conv.
1993 900 Turbo Conv. Auto
2003 9-3 Conv
2004 9-5 Arc Sedan
2005 9-3 SS 4 door
2005 9-3 SS Conv
2007 9-5 Aero Sedan
1986 900 Turbo Conv
A few parts cars also
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