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fuel cut off solenoid and hidden switch


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electrickery 
Member - Posts: 5
Member spacespace
Joined: May 08, 2009
Posted: May 08, 2009 at 6:28 AM / IP Logged  
Hello everyone,
I'm new and haven't posted here before so my apologies if this question has been answered before.
I am installing a fuel cut off solenoid for both saftey and security reasons on a very old vehicle. The idea is that if the ignition is switched off, fuel doesn't flow and mitigates the effect of a fire in an engine bay.
I want to incorporate a hidden switch so I can also use it for security. If that switch is broken and someone tries to drive the vehicle away, they won't get very far if they don't know about the solenoid and the hidden switch.
Here's the bit I don't know how to do.
When I break the circuit with the hidden switch, I would like an LED to blink on the dashboard to remind me that the switch is off and also fake an enabled car alarm.
How can a get power to flow to the LED when a switch is off?
Many thanks
Big Dog 
Gold - Posts: 1,265
Gold spaceThis member consistently provides reliable informationspace
Joined: May 02, 2002
Location: Quebec, Canada
Posted: May 08, 2009 at 10:59 AM / IP Logged  

Here's a quick diagram....sorry about the quality.

fuel cut off solenoid and hidden switch -- posted image.

Prepare your future. It wasn't the lack of stones that killed the stone age.
electrickery 
Member - Posts: 5
Member spacespace
Joined: May 08, 2009
Posted: May 08, 2009 at 11:12 AM / IP Logged  
Wow Big Dog, thank you very much for replying. Your picture was great quality compared to mine.
Unfortunately my old vehicle has a mechanical fuel pump. I had come up with a similar idea using a relay.
fuel cut off solenoid and hidden switch -- posted image.
I was a little concerned that with this method pin 87 is live when I have the car running. Is that OK?
Also, since posting, I've had a crash course on electrics and I've discovered DPDT switches and thought about this instead. Would that work with a 10A toggle switch from Maplin?
fuel cut off solenoid and hidden switch -- posted image.
electrickery 
Member - Posts: 5
Member spacespace
Joined: May 08, 2009
Posted: May 08, 2009 at 11:15 AM / IP Logged  
Ah, well those images didn't work. Maybe they were too big.
electrickery 
Member - Posts: 5
Member spacespace
Joined: May 08, 2009
Posted: May 08, 2009 at 11:23 AM / IP Logged  
I think the images were in a format that this forum can't handle. Hopefully this will work.
fuel cut off solenoid and hidden switch -- posted image.
fuel cut off solenoid and hidden switch -- posted image.
Big Dog 
Gold - Posts: 1,265
Gold spaceThis member consistently provides reliable informationspace
Joined: May 02, 2002
Location: Quebec, Canada
Posted: May 08, 2009 at 12:33 PM / IP Logged  
Your second diagram would work but not the first.
Prepare your future. It wasn't the lack of stones that killed the stone age.
electrickery 
Member - Posts: 5
Member spacespace
Joined: May 08, 2009
Posted: May 08, 2009 at 12:43 PM / IP Logged  
Thanks. I'll get some bits tomorrow and try to make it work. fuel cut off solenoid and hidden switch -- posted image.
howie ll 
Pot Metal - Posts: 16,466
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Joined: January 09, 2007
Location: United Kingdom
Posted: May 08, 2009 at 5:18 PM / IP Logged  
Wait, I know it's a mechanical fuel pump but surely if the engine stops turning, the fuel pump ceases?
ckeeler 
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Joined: June 20, 2008
Location: New Mexico, United States
Posted: May 08, 2009 at 5:43 PM / IP Logged  

howie ll wrote:
Wait, I know it's a mechanical fuel pump but surely if the engine stops turning, the fuel pump ceases?

bingo!!


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