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Old 07-23-2007, 04:37 AM   #1 (permalink)
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Inertia Switch

(posted a similar Q on the Jeep forum-don't know how many Ford people lurk over there)

Any real life experience with a modified vehicle using the stock fuel pump inertia switch? I'm concerned that with a leaf sprung short wheelbase vehicle, that the darn thing will be 'popping' everytime I hit a bad stretch of highway.

I'm also thinking about installing a on-off-on switch in the circuit to by-pass the inertia switch when off road. It'll give me the bonus of also acting as a anti-theft device in the off position.

Any thoughts?
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Old 07-23-2007, 04:54 AM   #2 (permalink)
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I played with one that came out of a Bronco II because I was thinking the same thing. I could shake it pretty good and never had it actually trip until I dropped it on the floor. I don't think it is going to go off on you just driving around.
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Old 07-23-2007, 06:32 AM   #3 (permalink)
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I have wheeled mine a ton without it having a problem. It's designed to trip with a hard hit, mine has not tripped yet, even upside down on an easy roll.
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Old 07-23-2007, 08:11 AM   #4 (permalink)
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Thanks! I'm just wondering if there is a difference between the passenger car switches and the truck ones? The one that I've got out of a 93 Mustang will trip if you give it a 'sharp' shake. I'm thinking that's a whole lot less than a minor impact.

I've driven Ford EFI cars for years, along with a 96 F150, and never had problems. But, I don't want to have any problems either.
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Old 07-23-2007, 08:26 AM   #5 (permalink)
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I had one out at an '89 Mustang in my old EB and never had a lick of trouble with it. I had mine mounted high on the kick panel on the passengers side close to the dash.
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Old 07-23-2007, 11:56 AM   #6 (permalink)
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I've been running one in my EB that I got out of a mid 90's T-bird at the you-pull-yard and it has never tripped on or off road. I like having it there thouigh just incase of a bad roll or accident on the road.
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Old 07-23-2007, 12:18 PM   #7 (permalink)
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I'm beginning to feel a whole more confidence in it working the way it was intended to!!!!

Thanks!
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Old 07-23-2007, 12:50 PM   #8 (permalink)
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i eliminated mine
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Old 07-23-2007, 12:51 PM   #9 (permalink)
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I wheeled a 91 bronco and hit some bumps with my 97 explorer, never popped. Tripped it on my 88 mustang, but that was after I launched it 95' at 130mph
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Old 07-23-2007, 01:52 PM   #10 (permalink)
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ive rolled my truck, jumped my truck, driven over dirt roads, pot holes, curbs, and i frequently use it as a ram... ive never had a single problem with mine.

i have had several problems with them on vehicles on my work. one was a van (i think it was a 91?) it had melted, but this vehicle had major work done to the electrical system (mexican wiring? )
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Old 07-23-2007, 01:53 PM   #11 (permalink)
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I've smacked the axles & undercarriage hard many times on mine and never had it trip either.

I wouldn't worry about it.
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Old 07-23-2007, 02:38 PM   #12 (permalink)
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I set mine off once or twice out of a group of about 30 rollovers or so

It's now been eliminated though and I ran the circuit through a toggle switch I can reach strapped into my harness'.

*edit* and I do recall this one time I was um... driving nicely... (ok that was a lie) in the sluice box and um landed on my rock slider part of the buggy and tripped it. But it was a SOLID and harsh hit *edit*
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Old 07-23-2007, 07:42 PM   #13 (permalink)
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Perhaps I should've titled the thread: What does it take to trip the switch.

Great stories. Love 'em all.
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Old 07-23-2007, 09:21 PM   #14 (permalink)
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I never wired one in.
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Old 07-24-2007, 09:23 AM   #15 (permalink)
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Never tripped mine or seen one tripped, but have heard of it. My Ranger is not a hardcore wheeler, but wheeling in my friend's abused beat ride we never tripped either...and he drives like a madman. If your truck won't start it's one of the first things to check and easy to reach.

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Old 07-24-2007, 11:36 AM   #16 (permalink)
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Ill be the odd duck and say I have had mine set off from somthing so light as releasing the parking brake.
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Old 07-24-2007, 11:45 AM   #17 (permalink)
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Quote:
Originally Posted by 94stepsideford View Post
...I have had mine set off from somthing so light as releasing the parking brake.
Damn. That must've been one hell of a parking brake.
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Old 07-24-2007, 07:37 PM   #18 (permalink)
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I thin after reading this there is somthing wrong with mine.
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Old 07-24-2007, 10:22 PM   #19 (permalink)
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Quote:
Originally Posted by 94stepsideford View Post
I thin after reading this there is somthing wrong with mine.
yeah probably. a slight tap on it should set it off, like with a hammer... but you cant really set it off by like flicking it or anything...
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Old 07-25-2007, 06:39 AM   #20 (permalink)
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yeah probably. a slight tap on it should set it off, like with a hammer... but you cant really set it off by like flicking it or anything...
I haven't tried flicking it yet
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Old 07-25-2007, 10:52 AM   #21 (permalink)
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always eliminated them. why worry about it.
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Old 07-25-2007, 12:26 PM   #22 (permalink)
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One of my BII peeps had his go bad last trail run and every freaken bump shut the truck down... I say use an oil pressure switch on the motor to kill the pump.
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Old 08-04-2007, 02:47 AM   #23 (permalink)
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I peeled both front tires off a 96 f150 by hitting a ditch at over 90 and the motor never missed a beat.

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Old 08-04-2007, 07:54 AM   #24 (permalink)
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Double DAMN!!
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Old 08-04-2007, 08:41 AM   #25 (permalink)
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Quote:
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One of my BII peeps had his go bad last trail run and every freaken bump shut the truck down... I say use an oil pressure switch on the motor to kill the pump.
How would that work on startup?
Any write up on doing this? or maybe a cool little bag of parts available from a vendor to accomplish this?

I never wired mine in, but I would think there is a correct "orientation" to mount it in to prevent it from going off all the time. "downward" bumps (potholes) etc shouldnt set it off.. but lateral bumps should... thats the point.. turn it off in the event of serious accident, not hitting a curb.

Think of all the disabled vehicles you would see on a stretch if bumpy road otherwise.
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