Fuel pump inertia switch - Ford Bronco Forum
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post #1 of 36 (permalink) Old 09-01-2004, 04:37 PM Thread Starter
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Fuel pump inertia switch

I have been having a problem lately when try to start it up sometimes it won't start. I noticed that I don't hear that humming sound from the fuel pump. I replaced the relay under the hood and it seems to cure it but now it's back. I checked that saftey inertia switch and it seems to be operating normal. What I did was pop the little button up, then crank it over won't start. push the button down and away she goes. So this last couple of times twice this week it wouldn't start, i just pop the button up then pushed it down- it fired right up. do these have a habit of going bad?? . I use to use it as my anti theft system for about a year. . -Bob



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Quote:
Originally Posted by Ranger1 View Post
I beat on it, beat on it and beat on it some more and I have the fork tool in there almost until it can't go in anymore.
Is there a trick to this ?
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post #2 of 36 (permalink) Old 09-01-2004, 04:46 PM
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I don't believe the switch is designed to be activated like that. It's sort of like a circuit breaker, every time it is tripped or manually switched it gets slightly weaker. So yes the switch could be going bad. But it could also be a fuel pump going bad & the switch activation is a coincidence.

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post #3 of 36 (permalink) Old 09-01-2004, 05:41 PM Thread Starter
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I thought that also, but trying to think cheap!



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Quote:
Originally Posted by Ranger1 View Post
I beat on it, beat on it and beat on it some more and I have the fork tool in there almost until it can't go in anymore.
Is there a trick to this ?
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post #4 of 36 (permalink) Old 09-01-2004, 06:09 PM
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Where is the inertia located on your truck?

And do you use the parking brake as a habit?
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post #5 of 36 (permalink) Old 09-02-2004, 09:34 PM
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The inertia switch shouldn't go bad with use, but I have seen melted terminals. If you need one, I have several spares. On '84-86, they're usually ***EDIT: just to the right of the tunnel in the passenger footwell***. On '87-96, they're usually inside the R kick panel.



{I don't know where I got that other location from... }
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post #6 of 36 (permalink) Old 09-02-2004, 10:30 PM
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you got a link to those pics in a larger size?

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post #7 of 36 (permalink) Old 09-02-2004, 10:52 PM
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Quote:
Originally Posted by Steve83
On '84-86, they're usually in front of the brake pedal.]
My 86's is on at the bottom of the fire wall, just above, and to the right of the transmision tunnel.

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post #8 of 36 (permalink) Old 09-02-2004, 11:01 PM
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mine too
http://www.fordfuelinjection.com/pub...itch_84-86.jpg
http://www.fordfuelinjection.com/pub...itch_87-96.jpg

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post #9 of 36 (permalink) Old 09-02-2004, 11:54 PM
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Quote:
Originally Posted by Fireguy50
you got a link to those pics in a larger size?
Yeah, my signature! The first one is in General Purpose Pics and the other is in "View all of this user's vehicles">"96 Bronco". But the first one is of my truck and that's just where I put the switch. I don't know why I put it there - I thought that was where they belonged, but I don't know how I got that idea.

Is that the large-body inertia switch with the white T-shaped button?
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post #10 of 36 (permalink) Old 09-03-2004, 12:14 AM
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Oh, hide that picture in a different vehicle
Hey you still got that 1996 5.8L ?
willing to sell a few parts off it?



Yes that is the older Inertia switch with the white button on top
I think the new ones are better with the red buttons

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post #11 of 36 (permalink) Old 09-03-2004, 12:17 AM
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Right!
Yes.
No. I'm only selling it complete.


I think all my spares are red, but I was curious what originally came on '84-86 EFIs.
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post #12 of 36 (permalink) Old 09-03-2004, 12:24 AM
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what if they don't want the OBD-II MAF stuff?
I really want that crank sensor and balancer/pulley

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post #13 of 36 (permalink) Old 09-03-2004, 12:45 AM
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Quote:
Originally Posted by Fireguy50
I really want that crank sensor and balancer/pulley
Do you want it for your D.I.S. conversion?

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post #14 of 36 (permalink) Old 09-03-2004, 12:50 AM
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yeah....
I need a backup 5.8L 28oz balancer
have it machined to match the explorer 5.0L 36-1 tooth wheel
make a braket for the sensor

BUT......
If I can buy that sensor w/ braket, balancer w/ pulley
It saves me the custom work, and possibly changing the balancer weight.

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post #15 of 36 (permalink) Old 09-03-2004, 01:17 AM
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Quote:
Originally Posted by Fireguy50
what if they don't want the OBD-II MAF stuff?
You'll have to discuss that with "they" after "they" buy it from me. Sorry, but I just don't think I can sell MOST of an engine...


...and I now own a '94 Crown Vic that's burning a little oil... 5.8L Crown Vic... Mmmmmmmmmmm...
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post #16 of 36 (permalink) Old 09-03-2004, 03:37 AM
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Crown Vic would need an aftermarket EFI intake
OR
carb it

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post #17 of 36 (permalink) Old 09-03-2004, 07:42 AM Thread Starter
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Quote:
Originally Posted by seboh
Where is the inertia located on your truck?

And do you use the parking brake as a habit?

Mine is located on the kick panel and no I don't use the emergency brake as a habit- probably once a week. Just so it doesn't freeze up!!


Steve I'll get one of those off of you. I'll Pm you-Bob



Broncoless at this time Yip she left me!!
Quote:
Originally Posted by Ranger1 View Post
I beat on it, beat on it and beat on it some more and I have the fork tool in there almost until it can't go in anymore.
Is there a trick to this ?
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post #18 of 36 (permalink) Old 09-03-2004, 12:28 PM
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Okay. Only reason I ask is that the switch on my 90 is located right next to the parking brake -- and releasing the brake can trip the switch.
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post #19 of 36 (permalink) Old 09-05-2004, 12:25 AM
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Quote:
Originally Posted by seboh
...releasing the [parking] brake can trip the switch.
Make sure the 2 nuts on the engine side of the firewall are tight, and the one bolt just above the pedal that goes up into the dash, and then spin your split rubber bumpstop on the big peg so that the pedal arm hits rubber instead of steel when you release it.

Why are you using the e-brake so often anyway? The hills in Raleigh aren't that steep!
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post #20 of 36 (permalink) Old 09-05-2004, 06:49 PM
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Quote:
Originally Posted by Steve83
Why are you using the e-brake so often anyway? The hills in Raleigh aren't that steep!
Nah, the pedal used to go nearly to the floor with the 10.25. It just had enough force to trip the inertia switch sometimes... probably some of the weak/worn switch problem, too.

And I use the parking brake all the time.... because I drive a stick shift.
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