Because of the fairly recent (the last several years), the addition of the ethanol at 10 percent may help emissions, and conserve usage, but it has a downside. This "new" fuel is very hard on rubber gas lines, and for cars that sit for long periods of time, whether it be because of winter weather, off season, or multiple cars belonging to the same owner, there is a specific problem to address. What happens is that the inside of the rubber gas line detiorates, and any hose between the gas tank, and the fuel filter puts a lot of burden on the filter. Ways to check this can be by poor acceleration, carburetor "starving" and hesitation at faster speeds (60 mph plus) and questionable mpg.
I was driving down from a rod run in Bellingham, Washington recently and experienced this problem first hand.
The next day in my shop, I pulled the fuel filter off and it, being one of the inline NAPA plastic ones, I could see how dirty it was. Dirty brown and black sediment. I cut it in half, and the dirt was powdery rubber from the hose. I have a steel line from my gas tank to my mechanical fuel pump. A steel line from the pump up to the rubber adapter hose for the filter, and another rubber hose from the filter to the carburetor. A total of about 10 inches of hose.
I replaced all three pieces then took the car for a drive. What a difference. I am recommending that these items be replaced yearly, or more often if needed for peak performance.

Don Amundson ASRA CM-094 &
Washington State NSRA Safety Inspector