GM Fuel Pump control scheme

[Bruce Plecan]

You would think of them LOL
Bruce


From: "Shannen Durphey" <Shannen at grolen.com>
> 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

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