GM Fuel Pump control scheme

[Bob Wooten]

This is what i thought but then it can be said that if the CPU is
controlling the fuel pump, it certainly knows if the engine is running or
not & can turn off the pump.  I always thought that the oil pressure switch
was in series with the fuel pump relay for the shut down & that the relay
gets its power from the Ign. switch but i just checked the diagram in my
manual & that is not the case & they are certainly in parallel.  

limp home mode sounds most plausible to me, but how does it get the motor
started?  no oil pressure no fuel, no fuel no oil pressure.

BW


> [Original Message]
> From: Keith D. Miller <kdmiller at westnet.com>
> To: <gmecm at diy-efi.org>
> Date: 1/26/01 8:42:18 PM
> Subject: RE: GM Fuel Pump control scheme
>
> > -----Original Message-----
> > From: owner-gmecm at diy-efi.org 
> > [mailto:owner-gmecm at diy-efi.org]On Behalf
> > Of Bob Valentine
> > Sent: Friday, January 26, 2001 10:59 PM
> > To: gmecm at diy-efi.org
> > Subject: GM Fuel Pump control scheme
> > 
> > 
> 
> > If the pump runs whenever ignition pulses are present,
> > then what's the need for the oil pressure switch?    
> > 
> 
> Fire prevention. If there's no oil pressure the assumtion is
> that the engine is not running or something has gone wrong
> (read accident), therefor fuel pressure may be a bad thing.
> 
> Keith
> --
> 88 CSC (Down, but not out)
> kdmiller at westnet.com
>  
>
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--- Bob Wooten
--- r71chevy at earthlink.net
--- www.r71camaro.homestead.com 


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