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12-19-2012, 09:12 AM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Fuel Cut-off Switch
I've always been a little nervous of the electric fuel pump continuing to pump fuel onto a hot engine in the event of a crash and I would like to fit some kind of electrical cut-out switch that will break the circuit to the pump in the event of an impact.
I'm sure others must have fitted something along these lines. Can anyone suggest or recommend a switch/device that would be suitable.
Thanks,
Paul
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12-19-2012, 09:39 AM
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CC Member
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Join Date: Dec 2011
Location: West Chester,
PA
Cobra Make, Engine: ERA #795 427 S/C completed Jan. '14 - '68 FE 427 side oiler
Posts: 1,052
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Not Ranked
Hi Paul,
I'm sure you'll get lots of feedback and ideas on this. An alternative solution would be to install a battery cut-off switch. I just ordered a keyed switch and plan to install it behind the passenger seat (I have a trunk mounted battery). I like the idea of being able to reach over and remove the key as an additional theft deterent. Of course, this would not be automatic, you'd have to reach over and turn the key to cut the power. Here is what I bought...
The Little Switch - With Mounting Bracket - FR1002 - 584 - 5470
Regards,
Kevin
__________________
"Anyone who drives faster than you is a maniac and anyone who drives slower than you is an idiot" - George Carlin
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12-19-2012, 10:01 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,012
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Not Ranked
Quote:
Originally Posted by FatBoy
I'm sure others must have fitted something along these lines. Can anyone suggest or recommend a switch/device that would be suitable.
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Paul, I would say 90% of the cars on the road today have a Fuel Pump Inertia Switch. Just Google it and you'll see you can pick one up at your local parts store that will suit your mounting needs and wiring convenience. This is a much easier task than you could even imagine. Here's a pic of a typical, generic FPIS.
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12-19-2012, 10:03 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,405
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Not Ranked
Are you considering an automatic or manual cut-off switch?
If you are considering the addition of a battery cut-off switch,
Consider that most of the normal installations of battery cut-off switches in our cars will not actually stop the engine from continuing to run after flipping the switch. This is because the battery might be isolated by the kill switch, but the alternator will continue to power the ignition system and electric fuel pump. Some fancy wiring can isolate the electric fuel pump (IF that is what you have installed) The easiest solution is the cut-off switch from Pegasus (part#4430) which will require you to rewire your alternator output wire to the cutoff switch to be isolated.
Note: Before anyone goes out to see if their cut-off switch will indeed shut off their car - you risk a big voltage spike thru your wiring when you cycle the switch with the car running - which is not good thing for your ignition box.
The nornal cut-off switch installation will work as a theft deterrent – preventing someone from starting the car.
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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12-19-2012, 01:28 PM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Many thanks or the replies. I already have a battery isolator, but I wanted an automatic switch, just in case I was incapacitated in the crash and couldn't throw the isolator switch.
The inertia switch seems to be what I need. I already have a switch for the fuel pump on the dash, so wiring in an inertia switch located behind the dashbord should be pretty straightforward.
Thanks again.
Paul
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12-19-2012, 04:49 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Not Ranked
Quote:
Originally Posted by patrickt
Paul, I would say 90% of the cars on the road today have a Fuel Pump Inertia Switch. Just Google it and you'll see you can pick one up at your local parts store that will suit your mounting needs and wiring convenience. This is a much easier task than you could even imagine. Here's a pic of a typical, generic FPIS.
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I had one of these installed on my Kirkham. IIRC, right under the passenger side dash. Cheap insurance.  |
12-19-2012, 05:59 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by RodKnock
I had one of these installed on my Kirkham. IIRC, right under the passenger side dash. Cheap insurance. |
You expecting an endo in the garage??  
__________________
Chas.
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12-19-2012, 06:38 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,012
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Not Ranked
Quote:
Originally Posted by ERA Chas
You expecting an endo in the garage?? |
If anyone could roll their Cobra in the garage, it would be RodKnock....  |
12-20-2012, 12:22 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
__________________
Gary
Gold Certified Holden Technician
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12-20-2012, 03:29 AM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Thanks Gary, but I don't think that is what I need. I want to cut the fuel in the event of a crash, not when the engine stops.
Thanks for looking though.
Paul
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12-20-2012, 08:41 AM
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Senior Club Cobra Member
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Join Date: Jun 2003
Location: West Linn,
OR
Cobra Make, Engine: ERA #684, 428 FE, TKO600
Posts: 1,378
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Not Ranked
X2 on the Inertia Switch recommended. Just make sure you mount it someplace easy to get to. Had one go out on me and was chasing my tail for a bit until I figured out it was the switch. Jumpered the plug to get me home but only took me about 15 minutes to change it out. Mine is mounted on a small secondary plate on the engine. Easy to see and get to.
DonC
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12-20-2012, 10:33 AM
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CC Member
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Join Date: Apr 2006
Location: Los Angeles,
ca
Cobra Make, Engine: Hurricane Motorsports, 427w
Posts: 439
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Not Ranked
Here's what I used:
Breeze Automotive Factory Five Racing
Can't tell you if it works or not 
__________________
Hurricane Motorsports #1053; 427w
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12-20-2012, 04:53 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Not Ranked
Quote:
Originally Posted by patrickt
If anyone could roll their Cobra in the garage, it would be RodKnock.... |
Rolling the Cobra in or out of the garage, yes, I'm a professional at pushing it. Of course, being only 2,100 lbs, it's fairly easy to do.
And with all the quad, calf, hammy, plantar and glut work that I do, it makes it that much easier.   |
12-20-2012, 05:12 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,012
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Not Ranked
Quote:
Originally Posted by RodKnock
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Uhhh, I'd like to see you concentrate more on helping others in 2013. You should take a page from Chas and sell that car of yours and donate the funds to the Society for Krishna Consciousness. You'll feel better about yourself and we'll all think the better of you for it. |
12-20-2012, 05:22 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Not Ranked
Quote:
Originally Posted by patrickt
Uhhh, I'd like to see you concentrate more on helping others in 2013.
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You should know by now, it's always about ME.  |
12-20-2012, 06:47 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
The guy had a 540 in a girly yellow mid year and told everybody it was a 396-he ain't helpin' nobody............. 
__________________
Chas.
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12-20-2012, 06:52 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,012
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Not Ranked
Quote:
Originally Posted by ERA Chas
The guy had a 540 in a girly yellow mid year and told everybody it was a 396-he ain't helpin' nobody............. |
Chas, did you hit the right thread with that post? |
12-20-2012, 07:27 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Yes-you want him to help others more-does that sound like his character as I outlined??
Oh-BTW, fuel cutoffs are a fine idea but I never had one in 27 years. And it won't matter anyway unless you safety wire the gas cap-like Jamo and me.
__________________
Chas.
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12-20-2012, 07:30 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,012
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Not Ranked
Quote:
Originally Posted by ERA Chas
Yes-you want him to help others more-does that sound like his character as I outlined??.
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OK, that's reassuring. I was about to move you up to Aricept-23 Aricept Home after first reading it.... |
12-20-2012, 08:11 PM
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CC Member
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Join Date: Mar 2006
Cobra Make, Engine:
Posts: 113
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Not Ranked
fuel cut off switch
hi Paul,
Napa part number FPS100 also comes with the proper connector.
cheers,
Mike.
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