Fuel pump doesn't run at key on. - Saab 900 Bulletin Board - Saabnet.com
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Fuel pump doesn't run at key on.
Posted by RayF (more from RayF) on Wed, 16 Nov 2011 09:50:17
In Reply to: Re: Fuel feed line check valve above pump, Saabnutt, Wed, 16 Nov 2011 06:55:13
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That's a myth that people typically believe about the C900 but it isn't true. You may hear various relays buzzing, etc., but NOT the fuel pump. That only runs when the engine is cranking or running.
The typical symptoms of a bad check valve are LONG CRANK but then the car starts fine and runs beautifully.
It wouldn't really be called hard starting unless you also have a weak battery too. Then the starter might just about die before the fuel pump ever builds up enough pressure to spray fuel into the cylinders.
There's a lilac-colored wire from the ECU to the fuel pump relay, a little skinny thing, which, if you tap into it with a tap connector, then run that tap to ground thru a pushbutton momentary-contact switch, lets you run the fuel pump before cranking, and helps overcome any pressure loss from a bad check valve.
posted by 71.173.65...
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