Posted by M Diesel on December 14, 2010 at 19:58:23 from (68.104.127.180):
In Reply to: tire pump posted by GordoSD on December 13, 2010 at 14:44:00:
Quoting Removed, click Modern View to see
They don't really work that way, or at least the later ones didn't. Had mine in the 70s. The spark plug replacement piece used a pair of flapper valves to draw in outside air. Think of the plug as a hollow tube with the hose attached to the top, and slots cut along the side of the tube. Inside the tube a couple of pieces of hard curved cardboard served as the flapper valve. Running at an idle the piston is pulling a pretty good vacuum, so the flapper inlet becomes the main source of air. Of course some fuel vapors had to be along for the ride, but I couldn't smell much.
They didn't work very well. Mine got me home three times though, from the true middle of nowhere, riding a motorcycle through the desert southwest.
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