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Thread: Fuel shutoff

  1. #1
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    Lightbulb Fuel shutoff

    Ok, this may have been discussed before or even done, but I couldn't find it. I was thinking the other day that it would be really awesome if instead of stevieg's access control I made something that demanded a password "ignition code" and if it didn't get it within 30 seconds it would kill the fuel pump or injector electrical circuit or something necessary but not crippling to the handling of the vehicle so that they wouldn't crash... just not be able to get away. You could have it either ask for it imediately or delay 10 seconds or something.. but then progressively get more emphatic and warn of vehicle disabling at the expiry time.

    It would require a simple application that I could code with a few helps from people on board here that have better coding skill than I (or would want to do it for me ) , a usb i/o interface... phidget or vellman ect. with atleast 2 digital outs, and a latching relay. The application would send a pulse to the relay which would effectively switch the power off to the pump... it will remain off until thrown back... this would keep crafty theves (whom at this point probably are running cause they are still too close to the crime scene and won't want to pop the hood for a better look) from shutting the car off... wating for the pc to go off then starting it again and making it farther... or ripping the pc out so that it won't hold the relay open. The other "optional" but really recommended item would be a bypass... we love our computers, but lets face it... they are untrustworthy at best. I would go with either a hidden switch or, my preference... a key switch in the glove box... you would have to open the glove box and insert a key ( which I would keep in my wallet or locked in the trunk or something seperate from the key ring) to get it to run again.

    The software could be really indepth or simple... but you could add like service mode which would allow a simple code to access it for limited time, or just limited time with countdown on screen letting them know that they better not try any crap. A limited number of tries... logging... different passwords for family members (lol, not usefull for me ) shutdown after a period of time after code failure... so that if they run the battery doesn't crap out with the key on...

    I'm sure there are bugs, but it seems like a great idea, and given my poor creativity skills... I figure somebody must have atleast thought of this... but I couldn't find anything in searches... there has to be some obvious problem I'm overlooking

  2. #2
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    by the way... this isn't replacing the key or starting... the car would start and run like normal and only stop if you didn't put the code in.

  3. #3
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    It seems like a simple hidden switch or key-switch would do the trick without the complications associated with hooking it to the computer. Although you would lose that "The Transporter" effect
    It also seems like the 30 second delay-before-cutoff could be potentially dangerous. Cutting the fuel pump while the car is in motion is probably not a good idea. What if it quit in the middle of an intersection or something? It would probably be safer if this killing the fuel pump business stayed in the parking lot.

    Good Luck.

  4. #4
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    if it does... they can't say they weren't warned... and you plan on disabling and reenabling the fuel pump everytime you get in... thats basically like turning the key... this would do it only if it detects un authorized entry.. I put a code in every time I get in my car anyways... so now it just would shut off the fuel pump.

  5. #5
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    I wouldn't trust software to control my fuel pump. There is a big difference between the embedded industrial computer that controls your car where all the software has undergone tremendous testing to something hooked up through the parallel port to a computer running Windows. I would be weary of doing this even if I wrote the code myself.

  6. #6
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    I'd use a microcontroller to do it

  7. #7
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    Use one of those electronic "combination lock" kit.


  8. #8
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    Quote Originally Posted by adaminc
    I'd use a microcontroller to do it
    This seems like the best alternative. You can have it display the keypad, or run off of one, and they are going to be much more reliable if you know what you are doing, and they also have a nearly instant boot time.
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  9. #9
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    ok, so basically people just don't trust their computers. Worst case the thing would screw up and shut off the fuel pump while driving. The car would coast to a stop and the bypass would be initiated and I would be on my way again.

    Any other reasons then just not trusting their computers?

  10. #10
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    I don't think coasting to stop is really the worst case. If you lose the fuel pump you also lose a lot of other stuff. Power Steering and Power Brakes to start with. And imagine the fuel pump cutting out while making a left turn into McDonalds (across traffic). The car stalls in the path of oncoming traffic. The point is, it could potentially be a lot more dangerous than "The car would coast to a stop".

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