Inertia switches
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Mountain Pass
Joined: Feb 2017
Posts: 205
Likes: 18
Inertia switches
Any of you guys that are running a fuel injected engine with electric fuel pumps using an inertia shut off switch? I'm not sure if I want to incorporate this into the build, from what I've been able to read about them a good sized pot hole could trigger it. I'm all about safety, but not at the expense of having to hassle with reseting the thing at every bad road we come across. Y'alls input as always is greatly appreciated. Thx.
Logistics Pro
Joined: Oct 2006
Posts: 4,029
Likes: 891
From: East Central Ia
You could go with the oil pressure switch set up but being injected it might run for awhile. None of the injected Fords I've driven have ever shut down on potholes or bumps. F350 dually was a rough riding truck too. Most of my trucks inertia switch in the right hand kick panel.
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,780
From: Burbank, WA
OEM's have been using them for decades. I've never had an issue with any of my new cars with them. It's not something you hear about being troublesome in the news, and if cars were shutting down all the time from rough roads, you'd hear about it. I don't think you'll have any trouble with one, as long as the one you use isn't defective. I see no reason not to scrimp, here. If you were ever to be in a hard crash and the fuel didn't shut off, you could have a really big "hassle."
Laughing Gas
Joined: Jun 2006
Posts: 1,159
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From: manitoba
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Elder User
Joined: Jun 2015
Posts: 791
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From: Louisville
The only issues I've heard about is when someone drives over a curb, etc. and slams the bottom of the vehicle against the pavement. Usually hard enough to jar your noodle. It's kind of a handy thing to have, not having the pump continuing to push fuel all over following an accident. Just place it somewhere not too difficult to reset and in the same orientation that it was in the donor vehicle (right side up, not sideways, etc.)
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Post Fiend
Joined: Feb 2008
Posts: 5,831
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From: St Albert, Alberta
The only issues I've heard about is when someone drives over a curb, etc. and slams the bottom of the vehicle against the pavement. Usually hard enough to jar your noodle. It's kind of a handy thing to have, not having the pump continuing to push fuel all over following an accident. Just place it somewhere not too difficult to reset and in the same orientation that it was in the donor vehicle (right side up, not sideways, etc.)
Below are a couple cut away's of the Ford inertia switch, they are the epitome of the "KISS" principle.
Senior User
Joined: Aug 2014
Posts: 201
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i've been kicking around the idea of using one on my truck, i just could never get see a straight answer on how to wire it. Through the ground wire to pump, through pump relay, through pump trigger wire coming from ford controls pack...
Let us know what you find out.
Let us know what you find out.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
In trucks the inertia switch went between the fuel pump relay and the fuel pump cutting main power to it. The Interial switch should cut main power in the fuel pump circuit and not the control power to the fuel pump relay.
Senior User
Joined: Aug 2014
Posts: 201
Likes: 0
makes sense, I guess the only thing would be to make sure the switch that is purchased can carry the load of the fuel pump without any problems
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Well besides being SOP for elec fuel pump installs, if you have an accident and rupture a fuel line the pump will just keep pumping fuel all over as long as the ignition is in on With EFI systems the volume of fuel it can move with no head pressure can be quite significant. It's a simple install that does not reduce reliability of the system it adds an accessible point for diagnostics, and really when was the last time heard of a Ford inertia switch failing ?