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Probly bad check valve at fuel tank.
Posted by RayF (more from RayF) on Wed, 7 Sep 2005 07:27:42
In Reply to: Re: all of a sudden, longer cranktime to start up, ICEMAN, Tue, 6 Sep 2005 16:56:32
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When it's bad, residual pressure in fuel rail drops off quickly at shutdown. Saab fuel pump only runs when running or cranking. When cranking, voltage/current drops so low fuel pump barely runs. Thus the long crank time when check valve is bad. Check valve is meant to hold fuel pressure in lines from when last run, and that works to provide pressure at startup.
There is an electrical work-around, put in a momentary switch to bypass fuel pump relay and hit its button just before cranking. Or replace check valve.
Do a search here under long crank time or check valve and do some reading.
posted by 64.223.210...
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