GM Fuel Pump control scheme

[Dave Zug]

Ever let the oil run a bit low and round a hard, long corner and have the
oil pressure drop? fresh oil is still on the surfaces and protecting them
somewhat, and when you come out of the corner things resume pressure-wise,
and you never knew unless you look at the oil guage every 30 seconds, like
me.

Now imagine you round that corner just as hard, oil pressure drops, engine
quits.. inertia shifts, loss of control is possible, power steering is
comprimized. in a manual trans and if the rpm's are up, an auto trans, the
car will re-start if the oil pressure returns.

Ralph nadar may have a field day, and the automotive world then will change
over to electric, aliens will take that as a cue that we are ready for first
contact, we will shoot at them, and they will eat all our brains.

(that sorta ran away on me) , I guess my point was, there are other things
to consider when altering a factory setup.. If the insurance company
investigates very far, a claim could be denied and others involved in an
incident may take your house away.

geeze am I paranoid or what? ;-)




----- Original Message -----
From: Wes Branchflower <hemi_265 at hotmail.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, January 28, 2001 4:54 AM
Subject: Re: GM Fuel Pump control scheme


> >Uh-oh.  You've got an orange and you're trying to tell me my apple's not
> >the same color.
>
> he USED to have the car.. he sold it for a good price and bought a TD
> Gemini!! :) He finds it a lot more 'fun'.
> >
> >What modification?  Removing the oil pressure switch?
> >Shannen
>
> No, making some sort of circuit to disable the ECM's relay control when
the
> car is running. That way the only thing keeping the fuel pump going is the
> oil pressure switch (held closed by the running engines' oil pump)
> If the oil pump failed, there would be no more pressure to hold the oil
> switch closed, and the engine would stop. (saving it from running w/o oil)
> Thinking about this it'd probably be easier to just wire up the ignition
to
> the oil switch somehow. A simple circuit to override the oil switch to get
> the ignition going while cranking, then off when the engine starts. This
> might work better so the engine doesn't run that extra litte while off
> pressure in the rail.
>
>
> You might think 'why bother' but with a soon to be $3000 built race
engine,
> which is known for oil pump problems, I will :)
>
>
>
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