How to put in a fuel shutoff? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*C-10 simplex* · 06-05-2011, 01:16 PM

How would you go about putting in a fuel shutoff?

NOte: this is intended to be a security device on a carbed car.

Psycho71 · 06-05-2011, 02:05 PM

Well, on a carbed vehicle the bowls on the carb will hold a certain amount of fuel, so the engine will still crank, it just won't go far w/o additional fuel. To install a shut off in the system, you'd need some type of solenoid in the fuel supply line, then have it wired toa switch of some kind to turn it on or off. But then if the solenoid ever fails, you will be stranded.

I suppose it could be done with a manual valve too. In this case all you'd need is the valve, and desired location along the fuel supply line somewhere. Then install it. I'd think a marine supplier would have a few options for the valve itself. Someone like West Marine maybe?

For security purposes, I'd put some kind of switch in the ignition circuit. Much easier, less expensive, and reliable. If HEI ignition, all you have to do is break the power supply to the ignition. Much more practical in my opinion.

*C-10 simplex* · 06-05-2011, 04:14 PM

Quote:

Originally Posted by Psycho71

Well, on a carbed vehicle the bowls on the carb will hold a certain amount of fuel, so the engine will still crank, it just won't go far w/o additional fuel. To install a shut off in the system, you'd need some type of solenoid in the fuel supply line, then have it wired toa switch of some kind to turn it on or off. But then if the solenoid ever fails, you will be stranded.

I suppose it could be done with a manual valve too. In this case all you'd need is the valve, and desired location along the fuel supply line somewhere. Then install it. I'd think a marine supplier would have a few options for the valve itself. Someone like West Marine maybe?

For security purposes, I'd put some kind of switch in the ignition circuit. Much easier, less expensive, and reliable. If HEI ignition, all you have to do is break the power supply to the ignition. Much more practical in my opinion.

How?

orbot · 06-06-2011, 01:07 AM

plumbing for the shut off valve would be some work, is it a track truck??

you can cut the power to the HEI coil by adding a switch in line with the power wire heading to the coil, do you have a spark box in the truck? if so theres a wire you can ground through a switch and when ever its grounded the truck will never turn on

**COBALT** · 06-06-2011, 04:59 AM

That's what I was thinking. Just interrupt the 12v wire to the distributor in some hard-to see place, then run your switch to somewhere only you know about. For points one could interrupt the resister wire from the distributor to the coil.

BigDan3131 · 06-07-2011, 04:30 AM

Another option is a keyed battery disconnect killing all power or a level style switch.

06-05-2011, 01:16 PM	#1
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	How to put in a fuel shutoff? How would you go about putting in a fuel shutoff? NOte: this is intended to be a security device on a carbed car.

06-05-2011, 02:05 PM	#2
Psycho71 Registered User Join Date: Jan 2006 Location: Kaufman, Tx Posts: 827	Re: How to put in a fuel shutoff? Well, on a carbed vehicle the bowls on the carb will hold a certain amount of fuel, so the engine will still crank, it just won't go far w/o additional fuel. To install a shut off in the system, you'd need some type of solenoid in the fuel supply line, then have it wired toa switch of some kind to turn it on or off. But then if the solenoid ever fails, you will be stranded. I suppose it could be done with a manual valve too. In this case all you'd need is the valve, and desired location along the fuel supply line somewhere. Then install it. I'd think a marine supplier would have a few options for the valve itself. Someone like West Marine maybe? For security purposes, I'd put some kind of switch in the ignition circuit. Much easier, less expensive, and reliable. If HEI ignition, all you have to do is break the power supply to the ignition. Much more practical in my opinion. __________________ You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. If a hammer doesn't fix it, you have an electrical problem! Slot Cars, 1:24 Scale, 100MPH@100,000RPM, fastest things on wheels! Last edited by Psycho71; 06-05-2011 at 02:08 PM.

06-06-2011, 01:07 AM	#4
orbot Registered User Join Date: Jan 2008 Location: Chula Vista, Ca Posts: 518	Re: How to put in a fuel shutoff? plumbing for the shut off valve would be some work, is it a track truck?? you can cut the power to the HEI coil by adding a switch in line with the power wire heading to the coil, do you have a spark box in the truck? if so theres a wire you can ground through a switch and when ever its grounded the truck will never turn on

06-06-2011, 04:59 AM	#5
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Re: How to put in a fuel shutoff? That's what I was thinking. Just interrupt the 12v wire to the distributor in some hard-to see place, then run your switch to somewhere only you know about. For points one could interrupt the resister wire from the distributor to the coil. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA. Last edited by COBALT; 06-06-2011 at 04:59 AM.

06-07-2011, 04:30 AM	#6
BigDan3131 Registered User Join Date: Jun 2006 Location: Maple Valley, WA Posts: 1,913	Re: How to put in a fuel shutoff? Another option is a keyed battery disconnect killing all power or a level style switch.



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