Inertial Fuel Cutoff Switch

Tom Lins

Tom Lins

New member
Dec 30, 2005
939
0
1
Elkton, FL
Being the worrywart that I am the accident and subsequent fire has me concerned about what happens when you have a serious accident and a fuel line
gets ruptured and your high pressure fuel pump is still running?
I worry that I (or whoever is driving) would not have the presence of mind to turn off the ignition or possibly unable to turn it off.
Has anyone installed a inertial switch wired to kill the fuel pump should you have an accident.
If you did what did you use?

--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
Manuals on DVD
http://www.bdub.net/tomlins/
 
A while back someone did a wiring diagram for an oil pressure cut off switch that cut power to the HP pump when the engine stopped and the oil pressure went down.

Not sure where that is stored.

Gary

>
> Being the worrywart that I am the accident and subsequent fire has me concerned about what happens when you have a serious accident and a fuel line
> gets ruptured and your high pressure fuel pump is still running?
> I worry that I (or whoever is driving) would not have the presence of mind to turn off the ignition or possibly unable to turn it off.
> Has anyone installed a inertial switch wired to kill the fuel pump should you have an accident.
> If you did what did you use?
>
>
> --
> Tom Lins
> St Augustine, FL
> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
> Manuals on DVD
> http://www.bdub.net/tomlins/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Legitimate concern. Some use oil pressure switches, but if the engine is
still running, they have no value. I reason that fire suppressants have
great value on board with fires, but inertial switches like the
ones that trigger air bags may have an application here. 2 lane, multi
directional roads play a part, as do inattentive drivers.
Jim Hupy

On Thu, Apr 4, 2019, 1:22 PM Tom Lins via Gmclist
wrote:

> Being the worrywart that I am the accident and subsequent fire has me
> concerned about what happens when you have a serious accident and a fuel
> line
> gets ruptured and your high pressure fuel pump is still running?
> I worry that I (or whoever is driving) would not have the presence of mind
> to turn off the ignition or possibly unable to turn it off.
> Has anyone installed a inertial switch wired to kill the fuel pump should
> you have an accident.
> If you did what did you use?
>
>
> --
> Tom Lins
> St Augustine, FL
> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
> Manuals on DVD
> http://www.bdub.net/tomlins/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
I believe the Ford Crown Victoria has a inertia switch to shut down the fuel pump from impacts.

Chaplain Randy Hecht
Chaplains are ready to Listen when you're ready to talk.

>
> Legitimate concern. Some use oil pressure switches, but if the engine is
> still running, they have no value. I reason that fire suppressants have
> great value on board with fires, but inertial switches like the
> ones that trigger air bags may have an application here. 2 lane, multi
> directional roads play a part, as do inattentive drivers.
> Jim Hupy
>
> On Thu, Apr 4, 2019, 1:22 PM Tom Lins via Gmclist

>
>> Being the worrywart that I am the accident and subsequent fire has me
>> concerned about what happens when you have a serious accident and a fuel
>> line
>> gets ruptured and your high pressure fuel pump is still running?
>> I worry that I (or whoever is driving) would not have the presence of mind
>> to turn off the ignition or possibly unable to turn it off.
>> Has anyone installed a inertial switch wired to kill the fuel pump should
>> you have an accident.
>> If you did what did you use?
>>
>>
>> --
>> Tom Lins
>> St Augustine, FL
>> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
>> Manuals on DVD
>> http://www.bdub.net/tomlins/
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
http://www.gmcmhphotos.com/photos/search.php?searchid=350581

http://www.gmcmhphotos.com/photos/electric-choke-conversion/p54560-electric-
fuel-pump-and-electric-choke.html

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Gary
Worobec via Gmclist
Sent: Thursday, April 4, 2019 3:34 PM
To: gmclist
Cc: Gary Worobec
Subject: Re: [GMCnet] Inertial Fuel Cutoff Switch

A while back someone did a wiring diagram for an oil pressure cut off switch
that cut power to the HP pump when the engine stopped and the oil pressure
went down.

Not sure where that is stored.

Gary

> On Apr 4, 2019, at 1:21 PM, Tom Lins via Gmclist
wrote:
>
> Being the worrywart that I am the accident and subsequent fire has me
concerned about what happens when you have a serious accident and a fuel
line
> gets ruptured and your high pressure fuel pump is still running?
> I worry that I (or whoever is driving) would not have the presence of mind
to turn off the ignition or possibly unable to turn it off.
> Has anyone installed a inertial switch wired to kill the fuel pump should
you have an accident.
> If you did what did you use?
>
>
 
I suspect the4 Crown Vic uses the same setup as did my '05 Ranger pickup. On the passenger side firewall just above the toeboard inside th4e cab
behin a tin guard there is a shock/turnover switch. which I found by tossing a gun case over on the passenger sid, striking it, and immobolizing the
truck till I found it and pressed the top of it. CLICK. Everything then worked and I drove it another 120k miles. Available in any junkyard.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
My 1987 Ford Econoline van have the inertial switch, same as described by Johnny Bridges above. It was the first fuel injected vehicle I owned. Sounds
like Ford used this switch for a number of years, so it might be a good switch for our purpose. Plenty of Ford vehicles had them.
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
 
I had thought of the OIl pressure monitor, that is simply a relay added in the circuit to a Electric fuel pump.
and yes, if the engine keeps running, so will the fuel pump.

An Inertia sensor, like the airbags have, would work but maybe you need to go further than just the fuel pump.

If a vehicle hits an object, say a big ole TREE at about 30 MPH. There can/will be significant damage.
THE GMC has that gas line running in front and below the radiator. if that line ruptures, gravity alone
will let the fuel flow.

I was thinking that you may need a solenoid installed at the fuel tanks, on the fuel lines for a positive
shut off of fuel. Even if that gas line is broken, the fuel flow will stop.

I may be thinking too much, I have that habit. Even so, we don't see that many accidents with fires, do we?

Just thinking out loud again.

slc
--
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
UBUNTU VOYAGER - Berzin Auto Center
 
My aerostar Van's all had them. Resettable by a cable near the the drivers
side interior wheel well. Should be a jillion of them in malls.
Jim Hupy

On Thu, Apr 4, 2019, 2:44 PM Bruce Hislop via Gmclist <

> My 1987 Ford Econoline van have the inertial switch, same as described by
> Johnny Bridges above. It was the first fuel injected vehicle I owned. Sounds
> like Ford used this switch for a number of years, so it might be a good
> switch for our purpose. Plenty of Ford vehicles had them.
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
My old Ford F350 has both an inertia switch AND and oil pressure switch. So the inertia switch has to be untripped AND there must be oil pressure for
the fuel pump relay to operate.

Here is a brand-spanking-new universal inertia switch from Standard Motor Parts (Part #FV7):

https://www.summitracing.com/parts/smp-fv7

Here is Standard's installation PDF:

https://eaccess.smpcorp.com/eCatalogs/Downloads/EMD/GF10900B.pdf

It appears a wiring pigtail is included; so that is nice.

Tom Newell
San Pedro, California

--
Proud Citizen of
Los Angeles, California
Founded 1781 as
El Pueblo de la Reyna de los Angeles, Alta California
 
My Ford Ranger had an impact (inertia) switch in the firewall. I just might
do that this weekend

Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Randy
Hecht via Gmclist
Sent: Thursday, April 04, 2019 1:42 PM
To: gmclist
Cc: Randy Hecht
Subject: Re: [GMCnet] Inertial Fuel Cutoff Switch

I believe the Ford Crown Victoria has a inertia switch to shut down the fuel
pump from impacts.

Chaplain Randy Hecht
Chaplains are ready to Listen when you're ready to talk.

> On Apr 4, 2019, at 4:36 PM, James Hupy via Gmclist

>
> Legitimate concern. Some use oil pressure switches, but if the engine is
> still running, they have no value. I reason that fire suppressants have
> great value on board with fires, but inertial switches like the
> ones that trigger air bags may have an application here. 2 lane, multi
> directional roads play a part, as do inattentive drivers.
> Jim Hupy
>
> On Thu, Apr 4, 2019, 1:22 PM Tom Lins via Gmclist


>
>> Being the worrywart that I am the accident and subsequent fire has me
>> concerned about what happens when you have a serious accident and a fuel
>> line
>> gets ruptured and your high pressure fuel pump is still running?
>> I worry that I (or whoever is driving) would not have the presence of
mind
>> to turn off the ignition or possibly unable to turn it off.
>> Has anyone installed a inertial switch wired to kill the fuel pump should
>> you have an accident.
>> If you did what did you use?
>>
>>
>> --
>> Tom Lins
>> St Augustine, FL
>> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
>> Manuals on DVD
>> http://www.bdub.net/tomlins/
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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> Being the worrywart that I am the accident and subsequent fire has me concerned about what happens when you have a serious accident and a fuel
> line gets ruptured and your high pressure fuel pump is still running?
> I worry that I (or whoever is driving) would not have the presence of mind to turn off the ignition or possibly unable to turn it off.
> Has anyone installed a inertial switch wired to kill the fuel pump should you have an accident.
> If you did what did you use?

Ok found a bunch of Ford F5AB-9341-AA which appears to be the sensor used in a Crown Vic and other Fords.
Looking at the wiring diagrams for my son's 04 Crown Vic it is after the power relay so this should be fairly simple.
That is until some day when I am the PO and the next owner is mumbling under his/her breath about PO's. ;)

I'll have to take on the oil pressure kill later.

Thanks for all the feedback.

--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
Manuals on DVD
http://www.bdub.net/tomlins/
 
Any fuel cutoff should be mounted as far to the rear as possible in a fuel line that delivers ALL fuel.

D C "Mac" Macdonald​
Amateur Radio K2GKK​
Since 30 November '53​
USAF and FAA, Retired​
Member GMCMI & Classics​
Oklahoma City, OK​
"The Money Pit"​
TZE166V101966​
'76 ex-Palm Beach

________________________________
From: Gmclist on behalf of Len Novak via Gmclist
Sent: Thursday, April 4, 2019 17:28
To: gmclist
Cc: Len Novak
Subject: Re: [GMCnet] Inertial Fuel Cutoff Switch

My Ford Ranger had an impact (inertia) switch in the firewall. I just might
do that this weekend

Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule
https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gmcmhphotos.com%2Fphotos%2Fshowgallery.php%3Fcat%3D4375&data=02%7C01%7C%7Cd984277307b94e137faa08d6b94cf8f3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636900137569162953&sdata=G0NvK1mVACmmYOkkML%2FQB%2FjNdYdQISgX%2BBStoYV5T4M%3D&reserved=0

https://nam03.safelinks.protection.outlook.com/?url=www.bdub.net%2Fnovak%2F&data=02%7C01%7C%7Cd984277307b94e137faa08d6b94cf8f3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636900137569162953&sdata=ZAjeThFsKSP8H2hYttYAy3voYfg9wc8rXC90ksF5Cp0%3D&reserved=0

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Randy
Hecht via Gmclist
Sent: Thursday, April 04, 2019 1:42 PM
To: gmclist
Cc: Randy Hecht
Subject: Re: [GMCnet] Inertial Fuel Cutoff Switch

I believe the Ford Crown Victoria has a inertia switch to shut down the fuel
pump from impacts.

Chaplain Randy Hecht
Chaplains are ready to Listen when you're ready to talk.

> On Apr 4, 2019, at 4:36 PM, James Hupy via Gmclist

>
> Legitimate concern. Some use oil pressure switches, but if the engine is
> still running, they have no value. I reason that fire suppressants have
> great value on board with fires, but inertial switches like the
> ones that trigger air bags may have an application here. 2 lane, multi
> directional roads play a part, as do inattentive drivers.
> Jim Hupy
>
> On Thu, Apr 4, 2019, 1:22 PM Tom Lins via Gmclist


>
>> Being the worrywart that I am the accident and subsequent fire has me
>> concerned about what happens when you have a serious accident and a fuel
>> line
>> gets ruptured and your high pressure fuel pump is still running?
>> I worry that I (or whoever is driving) would not have the presence of
mind
>> to turn off the ignition or possibly unable to turn it off.
>> Has anyone installed a inertial switch wired to kill the fuel pump should
>> you have an accident.
>> If you did what did you use?
>>
>>
>> --
>> Tom Lins
>> St Augustine, FL
>> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
>> Manuals on DVD
>> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.bdub.net%2Ftomlins%2F&data=02%7C01%7C%7Cd984277307b94e137faa08d6b94cf8f3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636900137569162953&sdata=0TGDRcS1EO3J2M2FSwx%2Ferb5jBTbh7DG7T7bJIhjfi8%3D&reserved=0
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
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It is all a guessing game trying to predict the scenario of what might happen. In my case my the engine fire started while the vehicle was parked and
running. So an inertia switch would not have helped. I did have an oil pressure switch and Laurie turned off the engine and ran out of the coach
whhen the fire started. The pump kept running and feeding gasoline on the fire because. The fire had already melted the pump wire and shorted it to
ground keeping it running.

I still use an oil pressure switch and an inertia one might be an added piece of protection in some scenarios. My only experience with them has been
in Ford sedans with them mounted in the trunk. They occasionally get tripped accidentally so mount it somewhere where you can get to it easily to
reset it.

Go for it. The junk yards are full of old Fords.

An automatic deploy AR-AFFF extinguisher might be another option as it would protect against not only gas but oil and trans fluid fires too.

I do not like halon types because it takes a lot of Halon to extinguish vehicle fires especially when the vehicle is moving, but take a look at this
one: I have one mounted in my Onan area. If you want more Halon capacity simply buy a longer one.

https://www.blazecutusa.com/collections/blazecut-for-vehicles

https://www.youtube.com/watch?v=Kswau1mGBE8

https://www.youtube.com/watch?v=iePku-2jh

https://youtu.be/JPHkLWQ3150
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
> It is all a guessing game trying to predict the scenario of what might happen. In my case my the engine fire started while the vehicle was parked
> and running. So an inertia switch would not have helped. I did have an oil pressure switch and Laurie turned off the engine and ran out of the
> coach whhen the fire started. The pump kept running and feeding gasoline on the fire because. The fire had already melted the pump wire and
> shorted it to ground keeping it running.
>
> I still use an oil pressure switch and an inertia one might be an added piece of protection in some scenarios. My only experience with them has
> been in Ford sedans with them mounted in the trunk. They occasionally get tripped accidentally so mount it somewhere where you can get to it easily
> to reset it.
>
> Go for it. The junk yards are full of old Fords.
>
> An automatic deploy AR-AFFF extinguisher might be another option as it would protect against not only gas but oil and trans fluid fires too.
>
> I do not like halon types because it takes a lot of Halon to extinguish vehicle fires especially when the vehicle is moving, but take a look at
> this one: I have one mounted in my Onan area. If you want more Halon capacity simply buy a longer one.
>
> https://www.blazecutusa.com/collections/blazecut-for-vehicles
>
> https://www.youtube.com/watch?v=Kswau1mGBE8
>
> https://www.youtube.com/watch?v=iePku-2jh
>
> https://youtu.be/JPHkLWQ3150

Those are interesting for the Onan compartment given the limited space.

I think I am going to mount the inertia switch under the driver side twin bed just to the rear of the wheel well.
and splice into the power connection just before the frame mounted FITech fuel pump.

I intend to install an oil pressure cutoff also. I just want to try to eliminate as many of the issues as possible.

--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
Manuals on DVD
http://www.bdub.net/tomlins/
 
> > https://www.blazecutusa.com/collections/blazecut-for-vehicles
> >
> > https://www.youtube.com/watch?v=Kswau1mGBE8
> >
> > https://www.youtube.com/watch?v=iePku-2jh
> >
> > https://youtu.be/JPHkLWQ3150
>
> Those are interesting for the Onan compartment given the limited space.
>
> I think I am going to mount the inertia switch under the driver side twin bed just to the rear of the wheel well.
> and splice into the power connection just before the frame mounted FITech fuel pump.
>
> I intend to install an oil pressure cutoff also. I just want to try to eliminate as many of the issues as possible.

As I said before I dislike Halon because of it's propensity for sinking and getting blown away in the wind or any moving air. Years ago I sold and
installation planned Halon systems for computer rooms, electrical distribution rooms, and telephone equipment rooms. I looked at the Onan air flow
and the locations where gasoline was available for fuel. I discovered that the areas that needed protecting the most was the side toward the front of
the coach and down from there to the rear bottom of the the tray where the fuel line ran. There really was no place to easily mount an automatic
deploy AFFF extinguisher in those areas. Most GMC - Onan installations that I have seen, have the extinguishers mounted to the front cover to the
rear away from the possible fire areas of carb, fuel pump, and fuel lines. This thing that you are looking at was thin enough and long enough to
protect those primary fire areas areas and still not be in the engine driven cooling fan air flow. So I did a compromise and settled for a tube full
of liquid halon.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
Inertia switches are prone to triggering in situations other than crashes. If you are going to fit an inertia switch you would be well advised to fit
a vacuum accumulator and/or vacuum pump as well.
 
Of the three vehicles I've owned with them fitted - all Fords - none ever went off except when it was hit. That being said, a GMC without a backup
system for the brakes is a way to bend your coach.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
> Inertia switches are prone to triggering in situations other than crashes. If you are going to fit an inertia switch you would be well advised to
> fit a vacuum accumulator and/or vacuum pump as well.

I already have a vacuum pump courtesy of the PO
I have never had a crash sensor trigger.

Probably should not have said that part given Murphy's law.
--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
Manuals on DVD
http://www.bdub.net/tomlins/
 
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