Exterior Fuel Cutoff 1974

[Restorit]

Hi All,
Was

[Restorit]

Hi all, was thinking about adding an exterior in-line fuel cutoff valve as a theft deterent. Would cut fuel line and splice in. Could reach under to turn on or off. Any thoughts? Could cut hard fuel line and add a valve with rubber hose and clamps at each end to re-attach. Not sure about the integrity or how safe it would be though?

[DarkShark]

Originally Posted by Restorit

Hi all, was thinking about adding an exterior in-line fuel cutoff valve as a theft deterent. Would cut fuel line and splice in. Could reach under to turn on or off. Any thoughts? Could cut hard fuel line and add a valve with rubber hose and clamps at each end to re-attach. Not sure about the integrity or how safe it would be though?

I'd opt for something else like an alarm or a starter kill switch (or other electric means) as opposed to killing the fuel supply.

Seems like another place to spring a leak or another part to replace later down the road.

[Wayne robson]

I agree with Dark shark, one of the best deterents is a kill switch can be mounted anywhere, on my 65 riviera i have one mounted inside the glove box, then it can be locked as well, basically its the small push pull stile switch availably any parts store for approx $5.00, black is best because its hard to see, you wire it to the positive side of your coil, but not at the coil connection, back approx six inches, make sure all connections are clean tight and taped. pull the switch your car will start, push the switch power is disconnected your engine will turn over but will never start. But remember on a corvette the battery is behind the seat, and the battery disconnects are great, so you can remove the green turn of knob and take it with you.

[DarkShark]

Wayne has a great idea using the negative lead on the coil.

That got me thinking... you could do the same thing with the park/neutral switch. Closed- car starts and the circuit is complete through the park/neutral switch. Open- no start (car appears dead; no functionality of the starter) because it is just like the car is in gear. My TPI system uses the park/neutral switch to prevent the fuel injectors from firing if its in gear.

If you go that route, you won't have to run very long wires. You could remove the ash tray and put the switch there. Then, close the cover- and its totally concealed!

How to do it- more than likely, you have a purple wire that goes to both the neutral and the park positions. The wiring starts with purple but on the actual switch it ends up green / red or green / pink. Anyways, on C3s it is usually accessible from the driver's side to the left of the gear selector. I'd get a set of terminal screwdrivers and remove the pin out from the block. Then, I'd obtain a brass pin (like the OEM version you just removed from the block) a 12 volt DC toggle, and some wire.

Here is the order from left to right-
New pin, wire, switch, wire, terminal for old pin, old pin

[Restorit]

Great feedback, Thanks. My districbutor is not original though, aftermarket electronic with no coil. How would I find the right wire to break? Thanks.

[DarkShark]

Originally Posted by Restorit

Great feedback, Thanks. My districbutor is not original though, aftermarket electronic with no coil. How would I find the right wire to break? Thanks.

For HEI- go with the (-) negative wire that says TACH. That wire is the ground while the (+) BATT is the positive lead.

What you'll need to do is go to the auto parts store and pick up a spade connector to push into the TACH lead and then a corresponding terminal to reattach to the distributor. Put the toggle in the middle, include enough length- and you are almost home!

[Restorit]

It says DELCO REMY on top. Got an orange and a black wire (around 16-18 gauge) that goes from the distributor, out towards the dash under the wiper motor. Another group of wires (Bl,Br,and orange around 12-14 gauge) comes out one end of the distributor and goes back into the distributor on the other side. Not really sure which is ground to break at a switch though. Maybe someone out there knows? Thanks for any help.

[6880 Mike]

FWIW: If you can "reach under" for your fuel shut off, so can a thief. All he has to do is whtch you "reach under" to turn it off.

A kill switch is more effective.