I replaced my fuel pump (`82, spec pump vs. `85 pump) and all was great until the sender stopped working after a few weeks because the Willcox-sourced sender had a wire solder issue which they replaced. But, during the replacement after 4-5 weeks I noticed that the small rubber hose that you referenced was already soft and soggy. It felt the same as the 35 year old hose which was on its last legs. It was a blessing that the sender prematurely failed because my wife and I take our car on an extended annual cross-State trip (from Canton, MI to Lexington, MI on Lake Huron) which could have caused a catastrophic failure. So, I went to the local parts store and specified that I needed a "fuel rated hose" replacement. It is critical to request a "fuel rated" hose which is slightly more expensive, but makes all the difference in the world. It cost less than two bucks for the small hose piece and it has performed flawlessly.
Bottom line, unless the small hose segment literally has a white printed notation on it as being "fuel rated", just spend the two bucks at your favorite auto parts store and buy the good stuff. Also, buy two hose clamps to properly secure the hose. I realize that the OE pump did not have the two small hose clamps, but the upgrade and peace of mind is well worth it.
Hope this helps -
Dave
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Lakeside 49