Making alloca more safe

[Walter Bright]

BCS wrote:
>> With the pump shut off, you have a few seconds of fuel left in the
>> carb. With no oil pressure, your engine is going to seize anyway.
> 
> In a few minutes yes (and it will still run for some time after it's 
> damaged beyond repair), more than long enough off get off the road. I'd 
> put a big buzzer in and let the driver decide when it is safe to shut 
> down the engine. In some situations, I'd gladly cook the engine to get 
> to safety.

There is an override on the switch to turn the pump on anyway, but it's 
a push button you have to hold down.


>>>> I also pried a switch off of
>>>> a junkyard Mustang that shuts off if it gets hit hard, I also plan
>>>> on
>>>> installing that to shut off the fuel pump. Think of those like a
>>>> "seg
>>>> fault" <g>)
>>> That one might even be worse because it only comes into play when you
>>> know things are going wrong; "as soon as things go wrong, my car
>>> quits working".
>>>
>> You *really* don't want your fuel pump to keep on pumping if you're in
>> an accident. That's the purpose of the inertial switch. With older
>> mechanical pumps, the pump would stop whenever the engine did. The
>> gasoline is safer remaining in the tank than being pumped all over the
>> road, the hot engine, and your trapped body.
> 
> So tie it into the inition system or a tilt switch (some 4x4 do that one).

It is tied to the ignition system already. The problem is, the ignition 
doesn't automatically turn off when you crash your car.

If you race cars, you are required to install a battery cutoff switch on 
the outside in an obvious location. This is so emergency personnel 
running up to save your a** can shut off the power first thing so no 
spark or whatever will set things on fire.

I have a quick disconnect on my battery. Whenever I work on the car, the 
first thing is always to disconnect it.