GM Fuel Pump control scheme

[Shannen Durphey]

Chevy luv trucks used the same setup as the vega.

Bruce Plecan wrote:
> 
> And you would explain the Vega, how?.
> Bruce
> 
> From: <WEG1192 at aol.com>
> > To me its obvious that Steve Ravet was right in that the OP switch is used
> to
> > keep the pump running during CPU failure, otherwise limp home wouldn't
> work
> > period. I can also say for certain that the ECM keeps the pump running as
> > long it recieves ignition pulses from the distributor. To say that the OP
> > switch is a backup for the F/P relay doesn't hold much weight to me. Also,
> > the OP switch isn't a safety to shut down the pump since if the engine
> stops
> > with the key on, the ECM will shut the pump off due to the lack of
> ignition
> > pulses. The only plausible resaon left is to keep the pump running during
> > limp home mode. JW
> 
> ----------------------------------------------------------------------------
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org