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fuel pump cutoff


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derrickg 
Copper - Posts: 119
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Joined: January 27, 2004
Location: Illinois, United States
Posted: December 30, 2004 at 3:12 PM / IP Logged  
i wanted to know how to make a fuel pump cutoff my friend says u can make one with a magnetic reed switch and some relays if so can u show me a pic of how it is done he says u wave a magnet in front of it and u can disarm it and u press a button under the dash to arm it i need pics please
Captanham 
Silver - Posts: 365
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Joined: December 18, 2004
Location: United States
Posted: December 30, 2004 at 5:28 PM / IP Logged  

ok, here is a drawing, three relays, one push buton, and one NORMALLY CLOSED reed magnet setup, you will have to get the wire for the fuse of the fuel pump, or sometihng like that, the power for the pump, or heck, even just an ignition wire or something like that to do this, your choice, hope you can understand this, the first two relays basically just set up a latching sytem, so you don't have to have a buton held down (if you know what i mean by that) the last relay actually cuts off or connects power to the fuel pump, and the reed switch will basically be the stopper for the latched relays, it will turn them off, i drew it in standard electronics relays, so that's why i put the legeond down there, most people don't draw relays like that anymore, but i labled the pins, so if you just run the wires like i labled the pins on the legend you should be good, if you need any other help just msg me

ohh and i outlined each switch and each relay to kinda make it a little less confusing, i know it's a mess, i had to hand draw it, i didn't think i could make it look any good on paint,, haha,, try and figure out my mess..

fuel pump cutoff -- posted image.

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Captanham 
Silver - Posts: 365
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Joined: December 18, 2004
Location: United States
Posted: December 30, 2004 at 5:29 PM / IP Logged  
ps sorry about the lines on the pick, bad scanner haha
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Captanham 
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Joined: December 18, 2004
Location: United States
Posted: December 31, 2004 at 7:51 PM / IP Logged  
yea that's whats going on, relay three runs threw the normally open, so that the fuel pump only gets power when this relay is energized, so that when the "security" system has power the fuel pump doesn't, you could put the 12V on the third relay as an ignition instead of constant if you want, it would save energy while the car is off.. this will work tho... only way i could think to do it with 3 relays, there are a few to do it with 4
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Captanham 
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Location: United States
Posted: January 02, 2005 at 1:28 AM / IP Logged  
yea, same effect, and it wouldn't come on with the ignition, it would come on with the switch, i get what you mean tho.. but yea, either way will work,
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bigjohnsona2 
Member - Posts: 7
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Joined: January 02, 2005
Posted: January 02, 2005 at 5:40 AM / IP Logged  

I could do it with much less componants then that, just 1 relay and i can do you a professinal drawing if you want me to.

Captanham 
Silver - Posts: 365
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Posted: January 02, 2005 at 11:04 AM / IP Logged  
with one relay you can do it so it's latching? and so that the fuel pump cut off circut is isolated? no holding down the buton? show me
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Captanham 
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Joined: December 18, 2004
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Posted: January 05, 2005 at 4:02 PM / IP Logged  
i think he was full of sh*t
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