Why is it that when you have a diesel that won’t start. Sometimes you can get it to start by covering the tailpipe? I’m not crazy this a thing I’ve done and seen other people do many times while nothing else worked.

The exact vehicle in question would be a regular humvee. NA V8 with single exhaust, and apart from the muffler, no other exhaust components (That I know of.)

I’ve asked several mechanics and the best answer I got was that the Army worked with Lockheed Martin to develop a device that goes in the tailpipe and sucks the life energy out of the soldier who puts his hands over it and uses it to start the truck.