manual fuel cut-off system??

[autoholic]

As I mentioned previously, you can remove the plunger from the solenoid with an adjustable wrench and fuel flow will be unobstructed.  You can then start the vehicle by rolling (assuming glow plugs aren't needed).  I simply do not see any advantage to a mechanical control over the current one.  To each their own.

Andrew

I second that. A simple 12V solonoid is the most simple way to go, especially since there is an existing 12V system in place already. A cable setup would be much more complicated and prone to problems/failure.
I can see with some industrial/marine applications where there is no 12V system, a lever or cable would be practical, but definitely not in a car.

[Methanolab]

As I mentioned previously, you can remove the plunger from the solenoid with an adjustable wrench and fuel flow will be unobstructed.  You can then start the vehicle by rolling (assuming glow plugs aren't needed).  I simply do not see any advantage to a mechanical control over the current one.  To each their own.

Andrew

I second that. A simple 12V solonoid is the most simple way to go, especially since there is an existing 12V system in place already. A cable setup would be much more complicated and prone to problems/failure.
I can see with some industrial/marine applications where there is no 12V system, a lever or cable would be practical, but definitely not in a car.

Yea but what if your 12v system is dead or your wires fry?

[autoholic]

Well, in the unlikely event your driving with a completely dead battery (hopefully not at night) you can remove the plunger out of the solonoid (but then you'd have to pinch the fuel line off to shut it down, or stall it out)
I have driven a Rabbit far with no charging, it would get to the point where lights were very dim, of course it was at night in the rain so I had no heat/wipers/defog either. The shut off solonoid never dropped out, I never had to remove the plunger, very little current to keep it energized.
I can see your point though, a manual override would not be a bad thing, they probably opted against this so crazy folks like us would not drive with no light, blinkers etc.

[jtanguay]

if you could implement a 12v toggle switch, you could keep it electric and mechanical... easier said than done though  :lol:

i wish i had that about 3 years ago... battery died on me and couldn't figure out why it wouldn't start when it was being pushed  :roll:   :lol:

[arb]

You can then start the vehicle by rolling (assuming glow plugs aren't needed).  

If the hill is steep / long enough, or you have a push / pull vehicle, you can indeed start the car sans glow plugs even in the dead of Michigan Winters. The engine just needs enough speed - far more than the starter motor. I have had to do this when my glow plug relay failed on and burned out all 4 plugs.

So, if you converted to a manual shut-off, I could see the advantage of an all mechanical IDI.

[jtanguay]

how do the detroit engines start without glow plugs?  i've seen this guy's tow truck with i believe an 8.7L turbodiesel engine  :shock:

truck sat for at least 2-3 months, and he wanted to show how quickly it started WITHOUT glowplugs.  it took one revolution and the thing fired right up, no hesitation, just pure diesel growl and smooth idle.  now how on earth did they do it??!!  granted that was on a fairly warm day, about 24-25C.  but he said it's the same even when its pretty cold.

[catlin_cava]

I made a switch for the fuel cut off....a line goes from to the cut off to the switch inside and back to the Positive post on the battery...switch on fuel on...switch off motor shuts off...simple and easy

[gigaz2]

well... thats how VW does it  :roll:

I have run a IDI without the plunger (alternator died, battery died)

and also push started a TDI with a completely dead battery by energizing the selenoid with a 9v battery (the small TV remote kind).
it was a cold night and it took us 10 meters to start it at the first try

we did a few attempts without the 9v bat, but the TDI needs about 8v so the ECU awakes and allows the selenoid to be energized and the alternator couldn't supply that much from pushing the car.

[Op-Ivy]

I have to agree with Andrew. The cutoff system that VW derived is far simpler than any other kind of mechanical device.

Think about how many times you have had problems with the throttle lever or cold start. A lot more than with the solenoid I'm sure.

Easy cutoff: tap into solenoid line, put in a simple electrical switch.

[FoXBoXRaCiNG]

I got an old 80 Kenworth, with a big Cat 3406A, my Emergency kill is air actuated 4" valve with a gate inside, it cuts off all the air going to the motor through the intake tube... What I noticed when I rebuilt it was the gate is spring actuated, with a manual override (cable), it would actuate. I've seen smaller valves like this in the big Fords of the older variety, I'm sure it could be grafted into place, albeit, you gotta pop the hood and reset the after setting it off  :roll:

[FoXBoXRaCiNG]

[zukgod1]

Personally, I'd be far more interested in a mechanical air shutoff than a fuel shutoff.  It would actually be useful in the event of a runaway.

Andrew

I agree, this would be much easier to build as well..

[arb]

how do the detroit engines start without glow plugs?  i've seen this guy's tow truck with i believe an 8.7L turbodiesel engine .

Its probably because they are direct injected (not IDI), have a faster starter - 24v likely, and might even be computer controlled injected with multiple injection events.

I bet if you hooked up an extra battery in series with your starter, you could start our IDI cold at 20 C without glow plugs. I wonder how long the starter would last ;-)