Wondering if anyone has posted a schematic or details on a fuel cutoff switch

With so many car jackings happening lately I'm interested in wiring in a hidden fuel cutoff switch in my 3rd gen. I did a forum search but only turned up people saying "yeah I need to do that too" but no actual details. I did not look on ama-zon yet, there may be a kit available, dunno.

Or perhaps there is a better way to approach this problem? Basically I want the truck to either not start/run, or to run and be drivable for only a block or so. And I don't want to use a fob or some other wireless thing because if the bad guy gets that then I'm hosed. Plus simple enough to tell others if needed but not very obvious.

At the risk of getting spanked by moderators, here is the video that made me start thinking about this topic. Warning, contains bad guys with weapons (never used just brandished) and may not be suitable for younger viewers. Admins: if I need to remove the link please TELL me first and don't just ghost ban me!

https://twitter.com/i/status/1577829371062239232

 

In the above scenario the last thing you need to be fiddling with is some sort of fuel cut off button. Nor do you want those guys, now stranded, spending the evening with you.

 

Could wire in a timer and a few relays. If driver door is opened while engine is running (need an AND gate circuit here), trigger a timer set for 30 seconds (or whatever time you want) that triggers another relay to open the fuel pump circuit. Only problem is that could be a bitch to troubleshoot if you have issues in the future (or sell the truck).

 

Naaa, the man would/should have hit the cutoff switch prior to getting out and pumping the gas. Or even better, the switch is a momentary that sets a flag or powers a solenoid so that every time the power is lost it auto-disconnects. Plus I said it should allow the car to drive for a very short while, thus removing the threat but not allowing them to actually get far away with the car.

 

Makes no sense to me to have a kill switch when you can just pull the keys when you pump and lock up the vehicle. These dudes usually pick people that are halfway in/out of the vehicle with keys in the ignition for rapid theft.

The better method is avoid pumping gas in inner cities where this type of shit has become more common if it’s an option.

 

I think if you repurposed the panic button on the key fob you might be able to get the logic and timing figured out on an Integrated Circuit. It would take some doing.

 

for a number of years, my dad ended up working on the bad side of town at a factory. over the course of a few months, a number of co-workers cars vanished during the day. so he rigged up a fuel cut to at least keep his then-new truck in the parking lot.

look up 'latching relay'. that's the essence of what any fuel pump disabling device is going to built off of.

he added a momentary switch under a flexible part of the dash on the left side(so he could press that with the one hand while cranking the motor with his right hand), and wired a relay that the momentary switch would trigger to the fuel pump power circuit. so the truck would turn over and crank, but being early efi, would never turn over.

the big question with these trucks is having a direct-injection design, the fuel pump actually pre-primes when you unlock the door via the fob, or open the door. this is done to reduce starting time.

so i don't believe a simple latching-relay design is going to work, as it would eliminate the initial priming sequence. what's needed on top of that is a delay timer that defaults to bypass the relay for 30 seconds for the system to prime.

 

I can hear on my '19 Sport that it primes when I insert my key in the ignition before turning it. So this type of system may still work for me as long as I hold the button in *before* inserting my key. Hmmm....

 

It would not have to be specifically a fuel pump kill switch. It could be any other way that would signal the ECM to shut off the engine if certain criteria are met or not met. The problem I see is disabling the vehicle while it is being driven could result in a serious crash and injury or death to either the criminals or bystanders. It might be considered a booby trap. There would be a loss of power steering and power brakes possibly at high speed. Lawyers would trip over each other to take your retirement.

 

jokes on them! i'm a millennial with no retirement, the crash of '09 obliterated any chance of it!

 

my '18 sport with push-to-start, i've noticed the pump running after i walk up to the truck and open the door. my normal routine is to put my lunch box in the back seat, so i'm opening a door other than the drivers door first.

 

https://www.tacomaworld.com/threads/fuel-pump-wire-location-pic-‘21-trd-pro.753384/

 

Awesome, that looks very useful thank you!

 

Someone posted a Ravelco thread here a while back. It's essentially an ignition disable that's hard to trace/un-do and ties into to just about any circuit that involves ignition. You pull this little plug and take it with you. A lot of Jeep Wrangler folks use them (like me) because a switch on the fuel pump relay or starter solenoid, while cheap and easy, is fairly easy to get around. It has to be professionally installed however.

 

No problem! I've been thinking of doing the same, mostly because i like the idea of having a hidden switch lol

 

I like the idea of a switch but my buddy hid an apple air tag in his tacoma. Easier way to track your truck and might give the cops a chance to catch the guys stealing it. I’m prob going to run out and get an air tag too.

 

i haven't heard of a successful case where the owner tells the cops where the car is and they just go and get it.

telling the cops the location of a stolen vehicle seems to just get added to the bottom of their to-do list.

now if you go to the location, and report 'shots fired'...

 

You be surprised by how many owners locate their own stolen vehicle. You are right about it being on the bottom of their to-do list. In Sacramento, we have Community Service Officers who often do recoveries which are low priority calls and don’t require a sworn peace officer to handle. But at least it would get recovered eventually, even if it takes sometimes hours for a response. Gotta love big cities.

 

An air tag works great when there are a lot of apple mobile phones around you, like in a big city, but those of us living in the boonies are outta luck. Better to prevent the theft in the first place with some kind of trick so they abandon the vehicle and go elsewhere. And better to let it drive a block or two then die so they don't feel pressured into torturing/shooting you to get the fob or information on how to enable the vehicle -- it gives them a chance to flee while leaving your vehicle in good shape.

 

I agree that splicing into the wiring harness somewhere deep under the dash is probably the most theft-deterring way to install a hidden switch. I’m just not a fan of cutting stock wiring so I’m gonna suggest something else.....Pull a critical fuse (fuel pump, spark, whatever) from under the hood and then use two wires tapped into the missing fuse location, going through an in-line fuse to a well hidden switch in the cab.

Definitely not as theft-proof as splicing a critical wire somewhere but it’s simple, less invasive and can be returned to stock easily. Just have to hope that the thieves get spooked when it won’t start and aren’t determined enough to start troubleshooting and checking fuses under the dash or hood.....

My two cents anyway....