Re: won't start trouble shooting - Anders? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: won't start trouble shooting - Anders?
Posted by Dean [Email] (more from Dean) on Mon, 13 Mar 2006 08:42:38
In Reply to: won't start trouble shooting - Anders?, Dave Healy, Mon, 13 Mar 2006 04:46:43
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Pumps can be that way and thumping the bottom of the gas tank can sometimes coax a reluctant pump to start. Connections can be a problem too. You can check ohms to ground from the fuse to see that the pump is in circuit.
After the brief ignition on fuel pump run, the pump will then only run again once the ECU sees the engine rotating from the crankshaft position sensor (CPS). If CPS is bad, the fuel pump will not run as the ECU does not know that the engine is being cranked. Bad CPSs will fail to work when hot and will work when cold. After a run and stopping, the CPS temps peak.
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