I installed the attached clear fram fuel filter to by 78 2F engine. Things have been going great almost burned through an entire tank since getting it on the road after 15 years. Then all of the sudden today it started strarving for gas. I went over and checked the fuel filter and it looked empty. I replaced it with another one that i had and boom the car started right up and this time the fuel filter looked full. About 15 miles later the same issue started to spudder and eventually stop. I was basically at my destination. It seems to idle and run fine in place. When i look at the fuel filter it looks pretty close to empty but new fuel appears to be entering. Am i running the wrong fuel filters? My goal is to have a clear one that i can see into to check if there is fuel.
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About your observing little fuel in your filter when running, I noticed something similar when getting my desmogged 79 going after sitting for many years. In my case the correct fuel level was visible in the carb sight glass and it didn't quit from fuel starvation like yours.
However, like yours, the fuel filter remained almost empty, with tiny bubbles visible while running.
Satisfied that a low level was ok, I didn't worry about it.
Recently, however, my fuel pump started dripping a bit so I replaced it. During the swap, I did a quick check of the fuel lines and noticed no obstruction when blowing them out.
Interestingly, when I restarted, my fuel filter (not replaced) now fills almost completely.
So, I wonder if my old fuel pump may have been marginal due to age and for some reason didn't fill the filter like the new one does?