Recently had some vapor lock on hot afternoon with winter fuel. So while looking over the situation, I dug out this Chrysler fuel pump bypass kit to see how it worked.

There is a second code on the box that looks like it could match a TSB, 14-73-3. My first guess was a TSB for fuel in 1973. But not turning anything up on Hamtramk-Historical. As far as I know, this kit was a Chrysler fix done by dealers.

Q1. What was/were the original applications?
I've been told two different things, both could be true.

Q2. What does 14-73-3 represent?

Background:
Bought this kit years ago based on a suggestion from a Chrysler parts manager when mentioning possible fuel issues. He rattled the part number off the top of his head- 2830 292.
IIRC he said it was a Chrysler fix for vapor lock.
Based on the instruction sheet at least one use was to prevent flooding from vapor lock between the fuel pump and the carb(s).

One more observation. The part number seems low for 1973.