Fuel Pump Cutoff Switch for Theft Prevention
By:vroom_chirp
This is to help in the fight against the recent rise in stolen 240’s, actually this can be applied to almost any car, but the rise in 240sx theft inspired me.
What you will need:
16 gauge wire
1 toggle switch
Male and female blade connectors
Wire cutters, crimpers, and pliers.
You dont have to use the fuel pump fuse like i did, you can use other fuses but make sure you use a switch that can handle the amps labeld on the fuse that you’re going to use.I used a 30 amp switch for a 10 amp fuse.
Locate the fuse box on the passenger side of the engine bay.
Notice the 10amp Fuel pump lable to the lower right.
Passenger front side fuse box
Fuel pump fuse label
Open the box and locate the fuel pump fuse.
Fuse box cover removed
Fuel pump fuse
Now it’s time to wire the switch to the fuse, follow this diagram:
Note: This is a recycled diagram. The fuse in the diagram is a 5 amp you must use a 10 amp.
Fuel cut off switch diagram
The switch I bought has the option for a lit LED while in the on position.
On the back side of it is labeled from top to bottom, earth, load, supply.
To make the switch work, you will run a wire from load and supply with two female connectors.
To make the LED work, I just used a hot wire that was not in use, and ran it to earth.
With that set up it all worked fine.
Testing the switch.
Before you mount the switch, test to make sure it’s done correctly. Turn the switch off and try to start the car, their may be some fuel in the injectors still. This will let it still start, but once that supply is gone the car should cut off.
Now turn the switch back on. Before you start the car, prime the injectors by turning the key to the “ON” position and waiting 4-5 seconds, and try to start the car, it should start like normal.
Mounting the switch.
If you’re mounting the switch in the interior somewhere, here is a good spot to run the wires into the car, it’s the a/c line holes, but there are other spots you can find if these are taken.
Also you may want to concider wraping the wires in black tape to stay as discreet as possible.
The two circles at the top of the pic are the A/C line holes wich you can run the wires through to the interior.
There are a few really good spots to mount the switch, but try not to make it obvious as to where it’s at (hide the wires well).This should help discourage someone who jumps into your car and finds all it’s doing is turning over but not starting.They are already stressed for time and searching for a hidden switch or button will make it that much harder on them.