Fuel Cutoff - Team Camaro Tech
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post #1 of 8 (permalink) Old Nov 23rd, 14, 12:18 PM Thread Starter
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Fuel Cutoff

Hello All,
Just completed a electric fuel pump kill switch setup, but still wanted added security and was decided to also added a fuel cutoff valve into the mix. I have all the parts, but not sure on best location to add. In front of the electric pump or after? I know letting a electric pump run dry is not good nor blocking its flow and building pressure up. Which is the less of the two evils? Before or after the pump?

Not to worried about the pump that can be replaced, just the safest route possible. Thanks Jim.
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post #2 of 8 (permalink) Old Nov 23rd, 14, 05:56 PM
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Re: Fuel Cutoff

The only situation I can think of to kill the gas supply this side of a wreck is the motor running out of oil. To cover that contingency I use am oil pressure solenoid that cuts the power to the fuel pumps solenoid if oil pressure ever falls below 7 psi. Holley sells it as their part number 12-810. Mr. Gasket, and Jegs sell a similar unit.

To by pass the cut off switch until pressure builds you can wire it with the factory points full power lead off the engines starter solenoid. Now if you can wire a fuel pump relay, an oil pressure switch and are even aware that the I terminal on the start solenoid is hot when the starter motor is energized by the ignition key you can probably think of a way to utilize the Single Pole-Normally Closed solenoid to either kill the power to your ignition box or to short to ground your distributor: as killing the ignition will save the motor that would be toast at lot faster than if you waited for it to run out of gas.

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post #3 of 8 (permalink) Old Nov 24th, 14, 12:25 AM
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Re: Fuel Cutoff

Dave, I think he wants a hidden fuel shutoff so as to help prevent theft. I used to run a in-line solenoid valve in my fuel line. It was wired via the ignition to a hidden toggle SW that I could, if I remembered to, shut off when leaving the car out of my sight. I've got other ways now.

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post #4 of 8 (permalink) Old Nov 25th, 14, 03:00 PM Thread Starter
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Re: Fuel Cutoff

Hi Fred,
This install in just a manual shut valve to make it one step harder for the creep to have to climb under the car to find . I what an added device that was not controllable from the interior like pulling the dist. rotor which I always do too!

The car will run for less then a minute with no fuel pump running (tested). If he finds all my hidden kill switches (as most professionals will or bypass if time is allotted) He would at some point have to climb under the car regardless and find the valve (more time spent which they hate).

I just wanted to know from someone who has done this before on their car which side of the electric pump was best. I must assume also that if they do bolt they will not worry about shutting off the pump which is also a concern? This is why I am also asking which side is best? Before it will run dry or after runs at full pressure? Which is worse? Which will cause the highest risk? Which is the less of the two evils?

Pump Holley 150: Needed to attain 6.5lbs at regulator.

The question is before or after the pump?
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post #5 of 8 (permalink) Old Nov 25th, 14, 03:53 PM
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Erik
 
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Re: Fuel Cutoff

If you are worried about burning up the pump or starving it, why not use a three way shut off valve? Close it off to the engine after the pump and just let it recirculate back to the pump or back into the tank?

other then that I not sure what would be the lesser of the two evils.
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post #6 of 8 (permalink) Old Nov 25th, 14, 04:42 PM Thread Starter
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Re: Fuel Cutoff

Planning to buy a Robb McPerformance setup for my stock tank plus a new regulator.. Granted this is best setup for sure, but in the interim I only have a single line setup

Jim..
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post #7 of 8 (permalink) Old Nov 27th, 14, 06:02 PM
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Re: Fuel Cutoff

I run mine before the pump. Allows me to shut off fuel when changing the pre-pump fuel filter with my sump tank.

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post #8 of 8 (permalink) Old Nov 27th, 14, 06:05 PM
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Greg
 
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Re: Fuel Cutoff

Do you have the RobbMC pickup yet? If not, just go ahead and get a sump tank now. I had early electric pump failure I think caused by "lifting" fuel using the RobbMC set up. It lets the pump siphon dry over the winter too.

I bought the Glenn's Performance tank.

69 Camaro, 3650lbs., 400ci, TH400, Coan 10" converter, 3.50 gear
D1SC, pump gas, street car, Water/Meth injection
1.302 60', 5.956 @ 116.4 Super Sniper EFI 2019
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