Re: No Fuel Pressure, new everything, whats going on? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: No Fuel Pressure, new everything, whats going on?
Posted by Dean (more from Dean) on Thu, 24 Apr 2014 09:15:16
In Reply to: No Fuel Pressure, new everything, whats going on?, Savary [Profile/Gallery]
, Wed, 23 Apr 2014 19:54:01
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When you turn on the ignition, the fuel pump gets energized for a second and you can hear that. When you crank the engine, the ECM does not know that this is happening unless it gets signals from the crankshaft position sensor. So make sure that it is connected properly. Some say that you should see movement on the tachometer when cranking, but I have never thought to observe that. When the ECU sees cranking it will then energize the fuel pump fuse. At the fuel pump fuse, you can measure voltage there when cranking. I can't recall which is the power leg. From that fuse you can measure ohms thru the fuel pump and then know if there is electrical continuity. You can also energize the fuel pump from there as part of your diagnostics. You can also do some of that at the fuel pump.
posted by 108.207.11...
Posts in this Thread:
- No Fuel Pressure, new everything, whats going on?, Savary , Wed, 23 Apr 2014 19:54:01
- update...., Savary , Fri, 25 Apr 2014 06:33:41
- Re: No Fuel Pressure, new everything, whats going on?, Mike Johnson, Thu, 24 Apr 2014 14:49:01
- Re: No Fuel Pressure, new everything, whats going on?, Dean, Thu, 24 Apr 2014 09:15:16 <-- Viewing This Message
- Re: No Fuel Pressure, new everything, whats going on?, AdamSAAB2kAero , Thu, 24 Apr 2014 06:24:23
- Re: No Fuel Pressure, new everything, whats going on?, Rob T, Thu, 24 Apr 2014 05:23:03
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