tested my injector shut-off switch
 

While restoring my '87 TII, I had the dash out and decided to install a switch to shut off the injectors for those *RARE* (yeah, right) occasions when it floods.

I found a small rocker switch in my old computer parts, and mounted it in the indent where the hood release goes. I tapped the hot side of the EGI fuse under the hood and wired it through the firewall.

Anyway, I had occasion to test it today. I stopped in a store and was back in the parking lot in 5 minutes ready to go. It was about 97 degrees and sunny. I hit the starter and got that familiar sound, and no start.

Here goes...I flipped the switch, cranked with WOT for 10 seconds. Turned the ignition off, flipped the switch back and hit the starter again. Immediate startup! Just like it starts in the morning.

Boy, thinking about all the times I sat and read for half an hour, or just watched traffic - *sheesh*.. Well, no more.

- k -

However, that's the wrong way to do this. You're passing the full current of the fuse through your switch, which is probably rated for AC and not DC. Not good.

Just splice into the fuel pump relay like everyone else does. :) Switch the coil connection of the relay.

i installed a toggle switch to my fuel pump and do the same, crank with the switch off so no fuel is being pumped, then switch it on and voila! it starts fine.

i hate the flooding problems! but now its fine :)

Actually, it's good for 30A DC, and has been working swell for some time. I noted that all the instructions on how to de-flood say to unplug the EGI fuse. If you just shut off the fuel pump, don't you have the pressure bleeding off through the injectors, thereby making it take longer to de-flood?

- k -

Relay's people......

You don't need a relay.
There is already one available.
On the steering column, there is a "main" relay that also controls the fuel pump - how convenient.
Look for the thin black (with white stripe?) wire - cut and install switch there.
This will kill the relay and is very low current.


-Ted

If it's actually rated 30A DC, then it should work. Just make sure that your wiring and connections are also good for 30A.

However, the best (easiest, safest) way to do it is to just switch the fuel pump relay.

If you switch off the fuel pump, there's virtually no pressure in the lines.