kill switch and EFI and MSD

[Flanders 47]

I was thinking of putting in a hidden kill-switch in the car.  Just getting a bit paranoid.

I've got MSD 6-AL along with Holley Terminator X.

 

The MSD has an easy "add a switch to the purple wire" process, which kills spark when the switch is on.  No problem there. My concern is if I do this, the engine will still crank and my fuel injectors will still squirt but the car will never start.  Aside from washing my cylinder walls with gas, this potentially could flood the engine should I ever forget about my kill switch and keep cranking it over and over.

 

Anyone put a kill switch in a car with EFI?  Ideally I want to cut off fuel AND spark.  Just not sure how to do this with single switch.

 

[Rsanter 158]

Double pole double throw switch

interrupt power to the MSD and the fuel pump

[det0326 189]

efi's have a tac signal that can be interupeted by a hidden switch. If the efi doesn't see this signal the injectors will not fire. However I have know some to create a dirty signal doing this so you need to keep the circuit as short as possible and use a good quality switch.

[smh00n 90]

I have Sniper and the cut off.

When you crank it and it doesn't start like it normally does, I remember the kill switch and turn it off. I find doing it in a crowded place with everyone watching you jolts your memory for times thereafter.

[AusTex70 77]

I have a Sniper and in-tank fuel pump. I have a hidden kill switch that disconnects the ground to the fuel pump really.

Just like Smh00n - I forget about it all the time!!! ;)

On 6/27/2024 at 2:08 AM, smh00n said:

I have Sniper and the cut off.

When you crank it and it doesn't start like it normally does, I remember the kill switch and turn it off. I find doing it in a crowded place with everyone watching you jolts your memory for times thereafter.