XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Is there a way to (Deliberately) Trip the Fuel Pump Cut Out

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Old 08-30-2017, 11:55 AM
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Default Is there a way to (Deliberately) Trip the Fuel Pump Cut Out

Hi Guys

Since I am properly Paranoid about one of my XJS's being Stolen, I was wondering if it were possible to (Deliberately) Trip The Fuel Pump Cut Out.

Without the need of turning the Car upside down

Preferably somewhere remote from where its positioned in the Car.



As an extra Security device, is there a way of Tripping the Cut Out deliberately?
 
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Old 08-30-2017, 12:06 PM
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Just give it a jolt with your hand. It trips easily. You may want to remove the plastic cover before wacking it. You can re-afix it using 3M dual lock so it's easily removable and replaceable.
 
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Old 08-30-2017, 12:07 PM
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Why not simply whip a fuse out? Or better the starter relay in the engine bay when left parked for a while...
 
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Old 08-30-2017, 12:53 PM
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Hi Daim

Cheers!

Which Fuse would you suggest?
 
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Old 08-30-2017, 12:56 PM
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I seem to recall that you had installed a battery cut switch on one of your cars, why not use it?

Then the cut out switch is in the locked boot with some protection. You would lose the alleged benefit of the car alarm, but they don't actually stop theft and are universally ignored by bystanders.

Audible car alarms do not have a significant effect on car theft.

The insurance data are unequivocal. In 1997, the non-profit Highway Loss Data Institute (HLDI) surveyed insurance-claims data from 73 million vehicles, to see which devices could prevent theft. Looking at cars from many different model years, across the country, the study concludes that cars with alarms "show no overall reduction in theft losses" compared to cars without alarms.

Paper: "Alarmingly Useless, The Case for Banning Car Alarms, in New York City", by Aaron Friedman, Aaron Naparstek & Mateo Taussig-Rubbo
Cheers
 
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Old 08-30-2017, 01:22 PM
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Hi Mac

I use the Battery Cut out switch all the time, even when I park for a few minutes.



Car Discarnect
One of the Best Pieces of Kit I've ever bought.
Just undo the Green Wheel a couple of turns to disconnect the Battery
 
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Old 08-30-2017, 04:02 PM
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If it's the early version, just take off the black plastic clip on cover and pull the plunger on top up. The later kind has a rubber cover over the plunger so you can't pull it up.

I once tripped it on a New Hampshire road loaded with frost heaves.
 
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Old 08-30-2017, 04:14 PM
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You could put an on/off switch on the UR line between the fuel pump relay and fuel pump. (looked at 1993 electrics)
 
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Old 08-30-2017, 04:33 PM
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Originally Posted by afterburner1
You could put an on/off switch on the UR line between the fuel pump relay and fuel pump. (looked at 1993 electrics)
Hi Afterburner

Cheers!

That sounds like a better idea than mine, so well worth looking into, as if I start Tripping the Cut Out.

Then it might start doing it when I don't want it to.
 
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Old 08-30-2017, 11:13 PM
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Personally I don't like it when batteries are connected, disconnected, connected, ... That will kill the electronics sometime. I'vergessen managed to kill a Bosch LH2.4 Jetronic ECU like that...
 
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Old 08-31-2017, 12:28 AM
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Hi Daim

I've been using the Battery Isolator Switch for over 3 years without any problems, surely nothing can happen until the Ignition is turned on.

Or am I missing something here?
 
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Old 08-31-2017, 11:49 AM
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i wouldnt mess with the trip thingy. it may get a "taste" for tripping. ive got a couple of inline spade terminals from the fuel pump in the boot near the battery. When i was having the battery changed at the local exhaust centre when i first got the car, the plum that was fitting it pulled one of the terms, not fully out but enough to make me spend half an hour trying to get the bloody thing started again. just pull a terminal out, a thief will soon give up if he cant start it and zoom off quickly.
 
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Old 08-31-2017, 01:15 PM
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Gosh you guys are all talking about pulling fuse panels and getting into the trunk everytime you get in and out of the car.

I think he is dead on with using the fuel cutout switch. All you have to do it grab it and pull it up (it clearly shows red). Thats easy to do and most people would never know to mess with it if they tried to steal the car.

Man, I leave mine unlocked 95% of the time. Don't even stress about it.
 
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Old 08-31-2017, 05:25 PM
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You could add a switch under the dash in series with the inertia switch simply flick it off when you get out and the car will not start.
 
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Old 08-31-2017, 05:48 PM
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Originally Posted by leo newbiggin
i wouldnt mess with the trip thingy. it may get a "taste" for tripping. ive got a couple of inline spade terminals from the fuel pump in the boot near the battery. When i was having the battery changed at the local exhaust centre when i first got the car, the plum that was fitting it pulled one of the terms, not fully out but enough to make me spend half an hour trying to get the bloody thing started again. just pull a terminal out, a thief will soon give up if he cant start it and zoom off quickly.
That's not a bad idea leo, I'll have a look at the set up.
 
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Old 08-31-2017, 05:54 PM
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Originally Posted by sidescrollin
Gosh you guys are all talking about pulling fuse panels and getting into the trunk everytime you get in and out of the car.

I think he is dead on with using the fuel cutout switch. All you have to do it grab it and pull it up (it clearly shows red). Thats easy to do and most people would never know to mess with it if they tried to steal the car.

Man, I leave mine unlocked 95% of the time. Don't even stress about it.
Hi sidescrollin

I've gone off messing around with the Cut Out Switch, like leo says, the Car could get a bit of a taste for it and start tripping out on its own, if the mechanism starts to get worn.

You wouldn't leave anything laying around down my way, it would be Gone in 60 Seconds.
 
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Old 08-31-2017, 05:57 PM
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Originally Posted by warrjon
You could add a switch under the dash in series with the inertia switch simply flick it off when you get out and the car will not start.
Hi Warrjon

I'm liking that a lot!

Would it just cut the Power or trip the switch or both?
 
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Old 09-01-2017, 01:49 AM
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Originally Posted by orangeblossom
Hi Warrjon

I'm liking that a lot!

Would it just cut the Power or trip the switch or both?
It would prevent the fuel pump circuit getting power at all. The switch would not "know" about it and would not trip. Great plan and quite straightforward to do. Pull the switch cover, drop the shin trim and maybe the side trim on the A post bottom, and the wires will be easily accessed.
 
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Old 09-01-2017, 02:58 AM
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Originally Posted by Greg in France
It would prevent the fuel pump circuit getting power at all. The switch would not "know" about it and would not trip. Great plan and quite straightforward to do. Pull the switch cover, drop the shin trim and maybe the side trim on the A post bottom, and the wires will be easily accessed.
Hi Greg

Cheers!

That sounds like a Plan! and I could hide the switch in the glove box.
 
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Old 09-01-2017, 05:56 PM
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Yep Greg is right, the inertia switch will not trip as it is a mechanical trip switch.
 
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