Two of the most fun things you can do with a duece. No brakes and a runaway engine. Well unless you count the third, putting a duece on its side...
I see a few options here. The object is to kill the engine as fast as possible right? Since the fuel is coming from a secondary source that seems out.
First cap the 1 inch port on the air cleaner. Then make the mushroom a quick removal. You could put a wingnut clamp on it. Personally from the sounds of previous posts I would not want to even open the hood for this. The next is make the mushroom attach like a auto light bulb. Install two 1/4 x 28 bolts 180 from each other in the air cleaner snout. Cover them with a short piece of alum, steel or brass tubing. Put a nylock on the end of the bolt to make two smooth posts. Carefully cut a twist and pull notch just like in a 1156 light socket. So the mushroom will push and twist to engage the posts. I'd probably put a tiny vynil coated cable on it to keep it with the truck just in case.
It would need to be kept from turning and coming off. Weld two small bumps on the mushroom on each side of the new groove you cut. Then before you put on the nylock nut on put a washer, heavy spring and another washer to spring load it. The spring loaded washer will have to travel over the weld bumps before allowing the mushroom to come off. Get a runaway, jump out twist and pull, drop the skirt and cover the air cleaner port and hope it works.
The other is a well fitted extra large washer to sleeve over the snout of the mushroom. One that is big enough to seal the mushroom. Retain it up against the skirt some how and when a runaway happens, break the tyewraps or what ever and let the washer slam shut. Sealing the ID might be an issue.
Anybody care to test these theories for me?
I dunno, Thats what I can think of so far. There is a Co2 extinguisher on CL here...
At least my brakes work.