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For the guys that have the done LT, LS swap what have you done/used for an emergency fuel pump shut off?



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Kevin

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dashboard wrote:

For the guys that have the done LT, LS swap what have you done/used for an emergency fuel pump shut off?

 The power for my electric pump is wired thru the oil pressure switch. No pressure, no power. You would need a relay to supply power in the start circuit



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Mitch D.   River Falls, WI

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Knowing Kevin as I do, I'm jumping ahead that you are thinking about what happens if you are in an accident, what shuts off the electric fuel pump to prevent it from continuing to pump fuel near flamable friendly items?  headscratch



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That's why mine is thru the op switch. In a frontal collision, most likely the engine stops or the battery is broken to cut power. The engine will usually stop running in a rollover too. Most cars will continue to run after a side impact.



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Mitch D.   River Falls, WI

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SShink wrote:

Knowing Kevin as I do, I'm jumping ahead that you are thinking about what happens if you are in an accident, what shuts off the electric fuel pump to prevent it from continuing to pump fuel near flamable friendly items?  headscratch

  Yep Stan’s right again, all new cars incorporate this safety feature. When the car suffers substantial impact, power to the electric fuel pump is terminated and must be reset to activate the fuel pump.

Fords used to have the reset in the trunk and some Chevy trucks had it in the passenger kick panel.

My question is what have guys been using or are they just taking there chances? 

Fuel tanks on these old A bodys do just hang there just on the other side of the bumper like the Ford Pintos. 



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Kevin

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I believe the newer cars with air bags and computers use those sensors to cut power in a serious collision. Our old cars don't have that luxury. If your concern is a rear collision, most likely you would be conscious enough to turn the key off and if the tank is ruptured, the pump running won't matter at all......the fuel is going to escape from the damage.

 



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Mitch D.   River Falls, WI

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Gm has never used an inertia switch like ford did or does. The relay for the fuel pumps on Gm's is controlled by the engine computer. The computer will only activate this relay if it sees RPM. So Mitch had it right that in an accident the engine will probably stall out and the fuel pump shuts off.



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Chris P
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My '87 Mustang GT had an "inertial" switch. You might want to look into what the "F" word has to offer and see it it's adapable. (I'm with you, I'd like an impact related cut-off).

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If your legs aren't broken run like hell!!

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I use an oil pressure switch too. Even before I did EFI, my last car with an electric pump also used an oil pressure switch. My concern wasn't so much impact as it was from blowing the engine up and it would keep pumping.

My dad's 90 econoline van had a fuel cutoff switch, was a pretty simple thing back then. I think it had a reset button right on it.

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I was interested in what guys where using if anything. I do want to have some means of securing the fuel pump in the event of a collision.  Really don’t want to rely on the engine stalling or battery getting smashed.

Something along the lines of the old Ford technology should work well; just a power interrupter. Or as Gearlube suggests turn the key off and run like hell if your legs are not broken and you’re able to.

Thanks for the input though this could be just the first of several dumb questions to come.  



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Kevin

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Derek69SS


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I just relied on the oil-pressure switch as well... if a line is severed, the engine won't run long without fuel pressure.

I could see a small pinhole or cracked line though allowing the engine to continue running while spraying fuel.

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Derek Kiefer - Mantorville, MN

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I guess I didn't give a cut off much thought on mine.  I would think any one of the sensors gets knocked off the motor, it should stall.  If it didn't, and if you broke a fuel line that would allow fuel to spray the motor would stall immediatly from no fuel pressure.  The LS motors need to have almost 60 pounds of pressure to run.  Once the motor stalls the pump will stop.  I suppose you could get a short in the computer, or harness that would hot wire the pump, but if all of the above align against you, running is your best option.



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Found this at NAPA.

http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=ECHFPS100_0306327181

 



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Kevin

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dashboard wrote:

Found this at NAPA.

http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=ECHFPS100_0306327181

 

 What is it ? No description. Looks like possibly a roll-over cutout ??



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Mitch D.   River Falls, WI

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 Emergency fuel pump shut off in the event of a crash.



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Kevin

Northwestern Ohio
SteveS


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A couple things missing would be how much it costs and how it works.  Is it activated by inertia?  How would drag racing or autocross effect it?  

 

Edit:I see if you hit the buy it online button it shows $109, still curious how it works.



-- Edited by SteveS on Friday 14th of September 2012 08:48:07 AM

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It says its a "Fuel pump cutoff switch, universal fuel pump cutoff switch". I dont see what more of a description is really needed. Like Dashboard says, it simply cuts off due to a crash. Be it roll over, collision, whatever.

 

And if you end up in a crash in a 40 plus year old musclecar. Your going to be having a lot more problems then worring about the fuel pump cutout. These things fold up like crushing an empty soda can under your foot. You have a better chance of survival in a crash driving a Smart car.



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Chris - Ramsey, MN.

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These old cars are nowhere near today’s standards when it comes to crash safety but they will take some abuse. There’s more than one guy walking around today that took one of these end over end, rolled it, hit things with it, got hit by other things while in it, or otherwise tried to kill themselves with it; ask Mitch.

Steve It’s is an inertia switch, what the G rating is I don’t know.

Unlike autocross and drag racing where the car is subjected to G forces of 2-3Gs or slightly higher in a crash an auto is subjected to instantaneous G forces that can be surprisingly high and still be survivable.



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Kevin

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For 109 dollars. I would rather go to the junkyard and get one out of a Ford product. At least you know its crash tested and engineered to work, plus cost less then 5 bucks. My old 95 Escort wagon had it in the rear cargo area but most Fords put it in passenger kickpanel including a lot of trucks and SUV's as well.  



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Chris - Ramsey, MN.

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dashboard wrote:

 

These old cars are nowhere near today’s standards when it comes to crash safety but they will take some abuse. There’s more than one guy walking around today that took one of these end over end, rolled it, hit things with it, got hit by other things while in it, or otherwise tried to kill themselves with it; ask Mitch.

 

Steve It’s is an inertia switch, what the G rating is I don’t know.

 

Unlike autocross and drag racing where the car is subjected to G forces of 2-3Gs or slightly higher in a crash an auto is subjected to instantaneous G forces that can be surprisingly high and still be survivable.

 What chu talkin bout, Willis ????  I've only been in 2 roll-overs and a few t-bones.....dunno



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Mitch D.   River Falls, WI

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Got me beat, I was passenger in a right side t-bone and only had 1 rollover.

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1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
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